raidctl

czezz · 03-21-2008, 07:30 AM

I got this:

Code:

# raidctl -l c0t0d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t0d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD


# raidctl -l c0t2d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t2d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD

What is "Volume" ?
Is that this what we call RAID which contain 2 disks
OR
Is this one of disks from RAID ?

How to understand disk 0.3.0 and 0.2.0. What are they ? How to find out what disks in real they are ? Why both output shows this same disks?

Here is an output of format:

Code:

AVAILABLE DISK SELECTIONS:
       0. c0t0d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>
          /pci@780/pci@0/pci@9/scsi@0/sd@0,0
       1. c0t2d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>

Specify disk (enter its number):

How many disks are inside in real - 2 or 4 ?

prad77 · 03-22-2008, 05:58 PM

There are only 2 accessible Disks.

The term volume is often used as a synonym for the storage medium itself, but it is possible for a single disk to contain more than one volume or for a volume to span more than one disk.

raidctl -l : List the system's RAID configuration. If controller is specified, list RAID configurations for controller.

Output from the -l lists the following information:
RAID Volume -Displays logical RAID volume name.
RAID Status -Displays RAID status as either RESYNCING (disks are syncing), DEGRADED RAID is operating with reduced functionality), OK (operating optimally), or FAILED (non-functional).
RAID Disk -Displays RAID disk name.
Disk Status- Displays disk status as either OK or FAILED.

RAID 1 uses mirroring to write data to multiple drives. This means that when you write a file, the file is actually written to two disks. If one of the disks fails, you simply replace it and rebuild the mirror.

Fedora Development

czezz · 03-23-2008, 08:24 AM

Ok Prad77... thank you for remainding what RAID1 is...
Not really this is my issue.

At my own eys I can see 4 disks inside of server. Previous admin told me that hardware mirror is done.

What I see with "format" is 2 disks - I suspect that these are 2 MIRRORS.
I just cant be sure because raidctl show this:

Code:

# raidctl -l c0t0d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t0d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD


# raidctl -l c0t2d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t2d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD

Im not sure how to read above. Correct me please, but what I understand is:

Volume c0t0d0 - is 1st MIRROR that contain 2 phisical disks and format display it as

Code:

0. c0t0d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>

Volume c0t2d0 - is 2nd MIRROR that contain another 2 phisical disks and format display it as

Code:

1. c0t2d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>

So phisically 4 disks are used... am I right ?

BUT...

If Volume c0t0d0 is 1st MIRROR and it contain 2 phisical disks 0.3.0 and 0.2.0
then why the heck Volume c0t2d0 which is 2nd MIRROR contain exactelly this same disks ???

Im confused

jlliagre · 03-23-2008, 12:54 PM

What returns "raidctl -l" with no other options ?

czezz · 03-23-2008, 07:29 PM

Code:

# raidctl -l
Controller: 0
	Volume:c0t0d0
	Volume:c0t2d0
	Disk: 0.2.0
	Disk: 0.2.0
	Disk: 0.2.0
        Disk: 0.2.0
	Disk: 0.2.0
	Disk: 0.2.0
        ...
        Disk: 0.2.0
^C
#

need to b stopped from keyboard.

jlliagre · 03-24-2008, 03:19 AM

Something definitely broken here. Check if you are up to date with patches.

Personally, I would certainly migrate this mess to ZFS.

czezz · 03-24-2008, 06:42 AM

OK... lets just let me understand again this - repeating again:

At my own eys I can see 4 disks inside of server. Previous admin told me that hardware mirror is done.

What I see with "format" is 2 disks - I suspect that these are 2 MIRRORS.
I just cant be sure because raidctl show this:

Code:

# raidctl -l c0t0d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t0d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD


# raidctl -l c0t2d0
Volume                  Size    Stripe  Status   Cache  RAID
        Sub                     Size                    Level
                Disk
----------------------------------------------------------------
c0t2d0                  136.6G  N/A     OPTIMAL  N/A    RAID1
                0.3.0   136.6G          GOOD
                0.2.0   136.6G          GOOD

Im not sure how to read above. Correct me please, but what I understand is:

Volume c0t0d0 - is 1st MIRROR that contain 2 phisical disks and format display it as

Code:

0. c0t0d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>

Volume c0t2d0 - is 2nd MIRROR that contain another 2 phisical disks and format display it as

Code:

1. c0t2d0 <LSILOGIC-LogicalVolume-3000 cyl 65533 alt 2 hd 16 sec 273>

So phisically 4 disks are used... am I right ?

BUT...

If Volume c0t0d0 is 1st MIRROR and it contain 2 phisical disks 0.3.0 and 0.2.0
then why the heck Volume c0t2d0 which is 2nd MIRROR contain exactelly this same disks ???

Im confused

jlliagre · 03-24-2008, 07:40 AM

There was no need to repeat what you already described.

Your setup looks quite broken and you pointed one of its inconsistencies. Raidctl failing to report anything good is another one. If I were you, I'd backup what needs to, break the mirrors and start again with a correct configuration.

czezz · 03-24-2008, 07:55 AM

OK, I understand that... and for some reason I dont want to care about that.
What I really need for now is to understand what raidctl displays for me.

Does anybody may take a look at my previous post and verify my conclusions ?

jlliagre · 03-24-2008, 08:43 AM

Quote:

Originally Posted by czezz

OK, I understand that... and for some reason I dont want to care about that.

You should unless you neither care about your data.

Quote:

What I really need for now is to understand what raidctl displays for me.

I'm not familiar with LSI controllers but my conclusions are the same as yours, raidctl reports a bogus configuration. The same disks cannot be used by two different volumes.