scsi_eh_[0-7] processes

jhwilliams · 08-21-2007, 02:50 PM

Code:

ps aux | grep scsi

returns:

Quote:

root 379 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_0]
root 380 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_1]
root 383 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_2]
root 384 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_3]
root 385 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_4]
root 388 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_5]
root 389 0.0 0.0 0 0 ? S< Aug20 0:05 [scsi_eh_6]
root 392 0.0 0.0 0 0 ? S< Aug20 0:00 [scsi_eh_7]

I googled scsi_eh - it is "SCSI Error Handler." I take it that this is bad. How do I get information on the "errors" that are likely present?

rtspitz · 08-22-2007, 12:29 PM

no it isn't.

may I guess you've got 8 scsi disks in you system ?

jhwilliams · 08-22-2007, 12:30 PM

Code:

no it isn't.

Praytell then - what!

Quote:

may I guess you've got 8 scsi disks in you system ?

Hell, even I thought that after seeing the running processes. But no, I have 4 SATA ("scsi") disks. Perhaps each has two processes.

rtspitz · 08-22-2007, 04:14 PM

we've got 2 machines here:

a) 3 sata disks + 1 sata raid (shows up as one disk) + 2 software raid devices = 6 block devices
this machine has a total of 6 scsi_eh threads.

b) 2 raids = 2 block devices. 2 scsi_eh threads.

so it seams reasonable to assume that each disk gets one scsi_eh thread.

rtspitz · 08-22-2007, 04:39 PM

forget that crap ;-)

if you have a look at /var/log/boot.msg you can see how many scsi channels are found.
each of those gets one scsi_eh thread. so maybe you have 8 sata ports ?

jhwilliams · 08-22-2007, 09:33 PM

Aha!

Code:

[jameson@sage ~]$ cat /var/log/dmesg  | egrep scsi[0-9]+\ :
scsi0 : sata_via
scsi1 : sata_via
scsi2 : sata_promise
scsi3 : sata_promise
scsi4 : sata_promise
scsi5 : pata_via
scsi6 : pata_via
scsi7 : SCSI emulation for USB Mass Storage devices