Raid 1 degraded

cferron · 10-15-2008, 04:50 PM

Ok I have 2 Disks /dev/sda and /dev/sdb. I think a cable got loose and now the system has remove 1 disk form the array.

the command df shos me the sda drive (That was in the array) but for some reason is not part of it now.

When I run:
mdadm --assemble /dev/md0
I get:
mdadm: device /dev/md0 already active - cannot assemble it

I would like to rebuild the array with the content of my /dev/sdb (the one currently running in the array) Is this possible?

Do you need more info?

Please help.

Claude

Output of:
mdadm --detail /dev/md0

Code:

/dev/md0:
        Version : 00.90.03
  Creation Time : Sun Mar 23 15:26:01 2008
     Raid Level : raid1
     Array Size : 222652736 (212.34 GiB 228.00 GB)
  Used Dev Size : 222652736 (212.34 GiB 228.00 GB)
   Raid Devices : 2
  Total Devices : 1
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Wed Oct 15 15:33:00 2008
          State : clean, degraded
 Active Devices : 1
Working Devices : 1
 Failed Devices : 0
  Spare Devices : 0

           UUID : 1e64d254:28ec35ec:b968d3b1:a0eef648
         Events : 0.116182

    Number   Major   Minor   RaidDevice State
       0       0        0        0      removed
       1       8       17        1      active sync   /dev/sdb1

My /etc/mdadm.conf file has the following:
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=1e64d254:28ec35ec:b968d3b1:a0eef648

My DMESG output is:

Code:

Linux version 2.6.22.1-smp (root@VSS) (gcc version 4.1.2) #21 SMP Thu Oct 18 13:25:42 EDT 2007

Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 88000000 (gap: 80000000:60000000)
Built 1 zonelists.  Total pages: 519685
Kernel command line: auto BOOT_IMAGE=VSS-Linux ro root=900

mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 16384 bytes)

Detected 2394.057 MHz processor.
Console: colour dummy device 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 2071240k/2095108k available (3390k kernel code, 22724k reserved, 1289k data, 292k init, 1177604k highmem)

virtual kernel memory layout:
    fixmap  : 0xffe17000 - 0xfffff000   (1952 kB)
    pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
    vmalloc : 0xf8800000 - 0xff7fe000   ( 111 MB)
    lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)

      .init : 0xc059b000 - 0xc05e4000   ( 292 kB)
      .data : 0xc044fbc7 - 0xc0592220   (1289 kB)
      .text : 0xc0100000 - 0xc044fbc7   (3390 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.

Calibrating delay using timer specific routine.. 4791.34 BogoMIPS (lpj=9582695)
Security Framework v1.0.0 initialized
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001

monitor/mwait feature present.
using mwait in idle threads.
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 4096K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 0
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e3bd 00000000 00000001

Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
Compat vDSO mapped to ffffe000.
Checking 'hlt' instruction... OK.
Freeing SMP alternatives: 17k freed
ACPI: Core revision 20070126

CPU0: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz stepping 0b
Booting processor 1/1 eip 2000
Initializing CPU#1
Calibrating delay using timer specific routine.. 4787.95 BogoMIPS (lpj=9575910)
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001

monitor/mwait feature present.
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 4096K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 1
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e3bd 00000000 00000001

Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz stepping 0b
Booting processor 2/2 eip 2000
Initializing CPU#2

Calibrating delay using timer specific routine.. 4788.01 BogoMIPS (lpj=9576026)
CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001
monitor/mwait feature present.
CPU: L1 I cache: 32K, L1 D cache: 32K

CPU: L2 cache: 4096K
CPU: Physical Processor ID: 0
CPU: Processor Core ID: 2
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e3bd 00000000 00000001
Intel machine check architecture supported.

Intel machine check reporting enabled on CPU#2.
CPU2: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz stepping 0b
Booting processor 3/3 eip 2000
Initializing CPU#3
Calibrating delay using timer specific routine.. 4788.01 BogoMIPS (lpj=9576037)

CPU: After generic identify, caps: bfebfbff 20100000 00000000 00000000 0000e3bd 00000000 00000001
monitor/mwait feature present.
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 4096K
CPU: Physical Processor ID: 0

CPU: Processor Core ID: 3
CPU: After all inits, caps: bfebfbff 20100000 00000000 00003940 0000e3bd 00000000 00000001
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#3.

CPU3: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz stepping 0b
Total of 4 processors activated (19155.33 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
checking TSC synchronization [CPU#0 -> CPU#1]: passed.

checking TSC synchronization [CPU#0 -> CPU#2]: passed.
checking TSC synchronization [CPU#0 -> CPU#3]: passed.
Brought up 4 CPUs
migration_cost=38,3618
NET: Registered protocol family 16
No dock devices found.

ACPI: bus type pci registered
PCI: Using MMCONFIG
Setting up standard PCI resources
ACPI: System BIOS is requesting _OSI(Linux)
ACPI: Please test with "acpi_osi=!Linux"
Please send dmidecode to linux-acpi@vger.kernel.org

ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Probing PCI hardware (bus 00)
PCI: Transparent bridge - 0000:00:1e.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]

ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI4._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI2._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI6._PRT]

ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11 12 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 *4 5 6 7 9 10 11 12 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 11 12 15) *0, disabled.

ACPI: PCI Interrupt Link [LNKE] (IRQs *3 4 5 6 7 9 10 11 12 15)
ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 9 10 11 12 15) *0, disabled.
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 *9 10 11 12 15)
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 *5 6 7 9 10 11 12 15)

Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI init
ACPI: bus type pnp registered
pnp: PnP ACPI: found 7 devices
ACPI: ACPI bus type pnp unregistered
SCSI subsystem initialized
libata version 2.21 loaded.

usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a report

ACPI: RTC can wake from S4
pnp: 00:01: ioport range 0x800-0x85f has been reserved
pnp: 00:01: ioport range 0xc00-0xc7f has been reserved
pnp: 00:01: ioport range 0x860-0x8ff has been reserved
Time: tsc clocksource has been installed.

Switched to high resolution mode on CPU 0
Switched to high resolution mode on CPU 1
Switched to high resolution mode on CPU 2
Switched to high resolution mode on CPU 3
PCI: Bridge: 0000:00:01.0
  IO window: d000-dfff

  MEM window: fa000000-fdefffff
  PREFETCH window: d0000000-dfffffff
PCI: Bridge: 0000:00:06.0
  IO window: disabled.
  MEM window: disabled.
  PREFETCH window: disabled.
PCI: Bridge: 0000:00:1c.0
  IO window: disabled.

  MEM window: f9f00000-f9ffffff
  PREFETCH window: disabled.
PCI: Bridge: 0000:00:1c.5
  IO window: disabled.
  MEM window: f9e00000-f9efffff
  PREFETCH window: disabled.
PCI: Bridge: 0000:00:1e.0
  IO window: disabled.

  MEM window: disabled.
  PREFETCH window: disabled.
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 16
PCI: Setting latency timer of device 0000:00:01.0 to 64
ACPI: PCI Interrupt 0000:00:06.0[A] -> GSI 16 (level, low) -> IRQ 16

PCI: Setting latency timer of device 0000:00:06.0 to 64
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 16 (level, low) -> IRQ 16
PCI: Setting latency timer of device 0000:00:1c.0 to 64
ACPI: PCI Interrupt 0000:00:1c.5[B] -> GSI 17 (level, low) -> IRQ 17

PCI: Setting latency timer of device 0000:00:1c.5 to 64
PCI: Setting latency timer of device 0000:00:1e.0 to 64
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)

TCP established hash table entries: 131072 (order: 8, 1572864 bytes)
TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered

Simple Boot Flag at 0x7a set to 0x1
apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
apm: disabled - APM is not SMP safe.
highmem bounce pool size: 64 pages
Coda Kernel/Venus communications, v6.0.0, coda@cs.cmu.edu

Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
Installing v9fs 9p2000 file system support
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered

io scheduler cfq registered (default)
0000:00:1d.7 EHCI: BIOS handoff failed (BIOS bug ?) 01010001
Boot video device is 0000:01:00.0
PCI: Setting latency timer of device 0000:00:01.0 to 64
assign_interrupt_mode Found MSI capability

Allocate Port Service[0000:00:01.0:pcie00]
Allocate Port Service[0000:00:01.0:pcie03]
PCI: Setting latency timer of device 0000:00:06.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:06.0:pcie00]

Allocate Port Service[0000:00:06.0:pcie03]
PCI: Setting latency timer of device 0000:00:1c.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.0:pcie00]
Allocate Port Service[0000:00:1c.0:pcie02]

Allocate Port Service[0000:00:1c.0:pcie03]
PCI: Setting latency timer of device 0000:00:1c.5 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.5:pcie00]
Allocate Port Service[0000:00:1c.5:pcie02]

Allocate Port Service[0000:00:1c.5:pcie03]
pci_hotplug: PCI Hot Plug PCI Core version: 0.5
vesafb: framebuffer at 0xfb000000, mapped to 0xf8880000, using 1536k, total 14336k
vesafb: mode is 1024x768x8, linelength=1024, pages=3

vesafb: protected mode interface info at c000:b580
vesafb: pmi: set display start = c00cb5e3, set palette = c00cb63e
vesafb: pmi: ports = 3b4 3b5 3ba 3c0 3c1 3c4 3c5 3c6 3c7 3c8 3c9 3cc 3ce 3cf 3d0 3d1 3d2 3d3 3d4 3d5 3da 

vesafb: scrolling: redraw
vesafb: Pseudocolor: size=8:8:8:8, shift=0:0:0:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
input: Power Button (FF) as /class/input/input0

ACPI: Power Button (FF) [PWRF]
input: Power Button (CM) as /class/input/input1
ACPI: Power Button (CM) [VBTN]
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Real Time Clock Driver v1.12ac

Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
floppy0: no floppy controllers found
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: module loaded
tg3.c:v3.77 (May 31, 2007)

ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 17 (level, low) -> IRQ 17
PCI: Setting latency timer of device 0000:04:00.0 to 64
eth0: Tigon3 [partno(BCM95754) rev b002 PHY(5787)] (PCI Express) 10/100/1000Base-T Ethernet 00:1e:c9:29:63:b8

eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] WireSpeed[1] TSOcap[1]
eth0: dma_rwctrl[76180000] dma_mask[64-bit]
Loading iSCSI transport class v2.0-724.
ahci 0000:00:1f.2: version 2.2
ACPI: PCI Interrupt 0000:00:1f.2[C] -> GSI 20 (level, low) -> IRQ 18

ahci 0000:00:1f.2: AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3f impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq pm led clo pio slum part 
PCI: Setting latency timer of device 0000:00:1f.2 to 64
scsi0 : ahci

scsi1 : ahci
scsi2 : ahci
scsi3 : ahci
scsi4 : ahci
scsi5 : ahci
ata1: SATA max UDMA/133 cmd 0xf8806100 ctl 0x00000000 bmdma 0x00000000 irq 18
ata2: SATA max UDMA/133 cmd 0xf8806180 ctl 0x00000000 bmdma 0x00000000 irq 18

ata3: SATA max UDMA/133 cmd 0xf8806200 ctl 0x00000000 bmdma 0x00000000 irq 18
ata4: SATA max UDMA/133 cmd 0xf8806280 ctl 0x00000000 bmdma 0x00000000 irq 18
ata5: SATA max UDMA/133 cmd 0xf8806300 ctl 0x00000000 bmdma 0x00000000 irq 18

ata6: SATA max UDMA/133 cmd 0xf8806380 ctl 0x00000000 bmdma 0x00000000 irq 18
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: ATA-8: ST3250310AS, 3.ADA, max UDMA/133
ata1.00: 488281250 sectors, multi 0: LBA48 NCQ (depth 31/32)

ata1.00: configured for UDMA/133
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.00: ATA-8: ST3250310AS, 3.ADA, max UDMA/133
ata2.00: 488281250 sectors, multi 0: LBA48 NCQ (depth 31/32)
ata2.00: configured for UDMA/133

ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata3.00: ATAPI: TSSTcorp CD-RW/DVD-ROM TS-H493B, D200, max UDMA/33
ata3.00: configured for UDMA/33
ata4: SATA link down (SStatus 4 SControl 300)
ata5: SATA link down (SStatus 4 SControl 300)

ata6: SATA link down (SStatus 4 SControl 300)
scsi 0:0:0:0: Direct-Access     ATA      ST3250310AS      3.AD PQ: 0 ANSI: 5
sd 0:0:0:0: [sda] 488281250 512-byte hardware sectors (250000 MB)

sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 0:0:0:0: [sda] 488281250 512-byte hardware sectors (250000 MB)

sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sda: sda1 sda2 sda3
sd 0:0:0:0: [sda] Attached SCSI disk

sd 0:0:0:0: Attached scsi generic sg0 type 0
scsi 1:0:0:0: Direct-Access     ATA      ST3250310AS      3.AD PQ: 0 ANSI: 5
sd 1:0:0:0: [sdb] 488281250 512-byte hardware sectors (250000 MB)

sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 1:0:0:0: [sdb] 488281250 512-byte hardware sectors (250000 MB)

sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sdb: sdb1 sdb2
sd 1:0:0:0: [sdb] Attached SCSI disk

sd 1:0:0:0: Attached scsi generic sg1 type 0
scsi 2:0:0:0: CD-ROM            TSSTcorp CDRWDVD TS-H493B D200 PQ: 0 ANSI: 5
scsi 2:0:0:0: Attached scsi generic sg2 type 5
Fusion MPT base driver 3.04.04
Copyright (c) 1999-2007 LSI Logic Corporation

Fusion MPT SAS Host driver 3.04.04
usbmon: debugfs is not available
PNP: No PS/2 controller found. Probing ports directly.
serio: i8042 KBD port at 0x60,0x64 irq 1
mice: PS/2 mouse device common for all mice

md: linear personality registered for level -1
md: raid0 personality registered for level 0
md: raid1 personality registered for level 1
md: multipath personality registered for level -4
device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel@redhat.com

TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 33
Starting balanced_irq
Using IPI Shortcut mode

kAFS: Red Hat AFS client v0.1 registering.
md: Autodetecting RAID arrays.
md: autorun ...
md: considering sdb1 ...
md:  adding sdb1 ...
md:  adding sda1 ...
md: created md0
md: bind<sda1>
md: bind<sdb1>

md: running: <sdb1><sda1>
md: kicking non-fresh sda1 from array!
md: unbind<sda1>
md: export_rdev(sda1)
raid1: raid set md0 active with 1 out of 2 mirrors
md: ... autorun DONE.
kjournald starting.  Commit interval 5 seconds

EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 292k freed
USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt 0000:00:1a.0[A] -> GSI 16 (level, low) -> IRQ 16

PCI: Setting latency timer of device 0000:00:1a.0 to 64
uhci_hcd 0000:00:1a.0: UHCI Host Controller
uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus number 1
uhci_hcd 0000:00:1a.0: irq 16, io base 0x0000ff20

usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1a.1[B] -> GSI 17 (level, low) -> IRQ 17
PCI: Setting latency timer of device 0000:00:1a.1 to 64

uhci_hcd 0000:00:1a.1: UHCI Host Controller
uhci_hcd 0000:00:1a.1: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1a.1: irq 17, io base 0x0000ff00
usb usb2: configuration #1 chosen from 1 choice

hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
sr0: scsi3-mmc drive: 8x/48x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 2:0:0:0: Attached scsi CD-ROM sr0
ACPI: PCI Interrupt 0000:00:1a.2[C] -> GSI 22 (level, low) -> IRQ 19

PCI: Setting latency timer of device 0000:00:1a.2 to 64
uhci_hcd 0000:00:1a.2: UHCI Host Controller
uhci_hcd 0000:00:1a.2: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1a.2: irq 19, io base 0x0000ecc0

usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 23 (level, low) -> IRQ 20
PCI: Setting latency timer of device 0000:00:1d.0 to 64

uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:1d.0: irq 20, io base 0x0000ff80
usb usb4: configuration #1 chosen from 1 choice

hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.1[B] -> GSI 17 (level, low) -> IRQ 17
PCI: Setting latency timer of device 0000:00:1d.1 to 64
uhci_hcd 0000:00:1d.1: UHCI Host Controller

uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 5
uhci_hcd 0000:00:1d.1: irq 17, io base 0x0000ff60
usb usb5: configuration #1 chosen from 1 choice
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 2 ports detected

usb 2-1: new low speed USB device using uhci_hcd and address 2
ACPI: PCI Interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 21
PCI: Setting latency timer of device 0000:00:1d.2 to 64
uhci_hcd 0000:00:1d.2: UHCI Host Controller

uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 6
uhci_hcd 0000:00:1d.2: irq 21, io base 0x0000ff40
usb usb6: configuration #1 chosen from 1 choice
hub 6-0:1.0: USB hub found
hub 6-0:1.0: 2 ports detected

usb 2-1: configuration #1 chosen from 1 choice
ACPI: PCI Interrupt 0000:00:1a.7[C] -> GSI 22 (level, low) -> IRQ 19
PCI: Setting latency timer of device 0000:00:1a.7 to 64
ehci_hcd 0000:00:1a.7: EHCI Host Controller

ehci_hcd 0000:00:1a.7: new USB bus registered, assigned bus number 7
ehci_hcd 0000:00:1a.7: debug port 1
PCI: cache line size of 32 is not supported by device 0000:00:1a.7
ehci_hcd 0000:00:1a.7: irq 19, io mem 0xfdfffc00

ehci_hcd 0000:00:1a.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb7: configuration #1 chosen from 1 choice
hub 7-0:1.0: USB hub found
hub 7-0:1.0: 6 ports detected
ACPI: PCI Interrupt 0000:00:1f.3[C] -> GSI 20 (level, low) -> IRQ 18

ACPI: PCI Interrupt 0000:00:1d.7[A] -> GSI 23 (level, low) -> IRQ 20
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: EHCI Host Controller
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 8

ehci_hcd 0000:00:1d.7: debug port 1
PCI: cache line size of 32 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: irq 20, io mem 0xff980800
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004

usb usb8: configuration #1 chosen from 1 choice
hub 8-0:1.0: USB hub found
hub 8-0:1.0: 6 ports detected
usb 2-1: USB disconnect, address 2
shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
usbcore: registered new interface driver hiddev

usb 2-1: new low speed USB device using uhci_hcd and address 3
usb 2-1: configuration #1 chosen from 1 choice
usb 2-2: new low speed USB device using uhci_hcd and address 4
usb 2-2: configuration #1 chosen from 1 choice

input: Logitech Optical USB Mouse as /class/input/input2
input: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on usb-0000:00:1a.1-1
input: Dell Dell USB Keyboard as /class/input/input3
input: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:1a.1-2

usbcore: registered new interface driver usbhid
drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver
Adding 1951888k swap on /dev/sda2.  Priority:-1 extents:1 across:1951888k
EXT3 FS on md0, internal journal

input: PC Speaker as /class/input/input4
Linux agpgart interface v0.102 (c) Dave Jones
Capability LSM initialized
tg3: eth0: Link is up at 1000 Mbps, full duplex.
tg3: eth0: Flow control is on for TX and on for RX.

ata1: soft resetting port
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
ata1: EH complete
sd 0:0:0:0: [sda] 488281250 512-byte hardware sectors (250000 MB)
sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
ata2: soft resetting port
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)

ata2.00: configured for UDMA/133
ata2: EH complete
sd 1:0:0:0: [sdb] 488281250 512-byte hardware sectors (250000 MB)
sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

ata3: soft resetting port
ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata3.00: configured for UDMA/33
ata3: EH complete
ata4: soft resetting port
ata4: SATA link down (SStatus 4 SControl 300)

ata4: EH complete
ata4: soft resetting port
ata4: SATA link down (SStatus 4 SControl 300)
ata4: EH complete
ata5: soft resetting port
ata5: SATA link down (SStatus 4 SControl 300)
ata5: EH complete
ata5: soft resetting port

ata5: SATA link down (SStatus 4 SControl 300)
ata5: EH complete
ata6: soft resetting port
ata6: SATA link down (SStatus 4 SControl 300)
ata6: EH complete
ata6: soft resetting port
ata6: SATA link down (SStatus 4 SControl 300)

ata6: EH complete
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
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kjournald starting.  Commit interval 5 seconds
EXT3 FS on sda1, internal journal
ext3_orphan_cleanup: deleting unreferenced inode 9371654

ext3_orphan_cleanup: deleting unreferenced inode 9371653
ext3_orphan_cleanup: deleting unreferenced inode 9371652
ext3_orphan_cleanup: deleting unreferenced inode 9371651
ext3_orphan_cleanup: deleting unreferenced inode 9371650

EXT3-fs: sda1: 5 orphan inodes deleted
EXT3-fs: recovery complete.
EXT3-fs: mounted filesystem with ordered data mode.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.

mostlyharmless · 10-15-2008, 06:07 PM

I believe you want mdadm --add /dev/md0 /dev/sda1

cferron · 10-15-2008, 06:17 PM

mdadm --add /dev/md0 /dev/sda1

What about the swap partition on sda (sda2)? Will it sync with the other on sdb?

I also have a NTFS partition on sdb3 - sda3

Is it 99,9% sure that I will not loose some stuff on sdb?

Thanks

Claude

mostlyharmless · 10-16-2008, 02:42 PM

Quote:

What about the swap partition on sda (sda2)? Will it sync with the other on sdb?

For swap you can either use the same command for sda2 or you can add another line in fstab for the other swap partition and give it the same priority.

Quote:

I also have a NTFS partition on sdb3 - sda3

If you're using RAID 1 from Windows, you can assemble the two partitions; I'll have to look up how I do that exactly and I'm not at my home machine.

Quote:

Is it 99,9% sure that I will not loose some stuff on sdb?

Backup first

cferron · 10-16-2008, 04:37 PM

Can't I simply go like this:
mdadm /dev/md0 -a /dev/sda
or
mdadm --assemble --uuid=1e64d254:28ec35ec:b968d3b1:a0eef648

And this would simply that each partition and duplicate then as my Raid is a Raid1 setup?

I think I don't really understand the difference between ADD or ASSEMBLE...

Is it mandatory to have the swap partition mirrored?
What if I log in windows on a drive (and windows is not setup to do raid) and then I log back in my linux configuration?
Will the the array become not synchronize?
Should I just ignore the sda3 partition and just go with the sda1 & sda2?

Thanks... I know I ask lots of questions.

P.S Will do the backup, but understand that the machine is not physically with me... So if I crash the system there is no way back. This is all done over terminal.

P.S(2) Does anyone know a Rescue CD I could boot and have a ssh server coming up (similar to a slackware setup disk) but with SSH server? This could help me if I screw up both hard drive.

Claude

mostlyharmless · 10-17-2008, 03:16 PM

Quote:

Can't I simply go like this:
mdadm /dev/md0 -a /dev/sda

No, if you do that you will be using the whole disk and will have no partition table. mdadm will not automatically mirror each partition.

Quote:

I think I don't really understand the difference between ADD or ASSEMBLE...

assemble means take two (or more) pieces of raid info and make an array. The array is already in existence, you just haven't assembled it yet. Sort of like a bike at Xmas.

add means you take an existing array and add new space to it. Sort of like adding training wheels to your bike.

I highly recommend man mdadm.

Quote:

Is it mandatory to have the swap partition mirrored?

Nothing is mandatory, most people don't mirror swap, some people use raid-0 on swap. I quote:
http://unthought.net/Software-RAID.H...D.HOWTO-2.html

Quote:

There's no reason to use RAID for swap performance reasons. The kernel itself can stripe swapping on several devices, if you just give them the same priority in the /etc/fstab file.

A nice /etc/fstab looks like:

/dev/sda2 swap swap defaults,pri=1 0 0
/dev/sdb2 swap swap defaults,pri=1 0 0
/dev/sdc2 swap swap defaults,pri=1 0 0
/dev/sdd2 swap swap defaults,pri=1 0 0
/dev/sde2 swap swap defaults,pri=1 0 0
/dev/sdf2 swap swap defaults,pri=1 0 0
/dev/sdg2 swap swap defaults,pri=1 0 0

This setup lets the machine swap in parallel on seven SCSI devices. No need for RAID, since this has been a kernel feature for a long time.

Another reason to use RAID for swap is high availability. If you set up a system to boot on eg. a RAID-1 device, the system should be able to survive a disk crash. But if the system has been swapping on the now faulty device, you will for sure be going down. Swapping on a RAID-1 device would solve this problem.

Moving right along:

Quote:

What if I log in windows on a drive (and windows is not setup to do raid) and then I log back in my linux configuration?

If you can get Windows to read the Linux filesystem, then use READ-ONLY, else you'll desync your RAID and will be very sad. There may be opensource third party tools to read Linux RAID from Windows, but I wouldn't do it if I were you. If you had to, the safest approach would be to run coLinux and mount the RAID under samba.

Quote:

Should I just ignore the sda3 partition and just go with the sda1 & sda2?

That would be safe.

cferron · 10-19-2008, 10:15 AM

mdadm /dev/md0 -a /dev/sda

That did the trick.....

Won<t mirror my swap finally and same is true for the windows partitions.

Thanks for your time!