[SATLUG] Software RAID suggestions

Jeremy Mann jeremymann at gmail.com
Fri Feb 26 16:51:02 CST 2010

On Fri, Feb 26, 2010 at 1:39 PM, FIRESTORM_v1 <firestorm.v1 at gmail.com> wrote:

> My only concern is that the third line [UUU_] looks a little odd.   I
> expected [UUUU] since I have 4 SATA drives and I specified their
> devices on the commandline:
> #  mdadm --create /dev/md0 --level=5 --raid-devices=4 /dev/sdb
> /dev/sdc /dev/sdd /dev/sde
> I don't recall anyone specifying what the [UUU_] but can someone tell
> me if I'm chasing ghosts or letting myself get too nervous?

Matt, "_" means one drive is offline, but that could be the one that
is rebuilding. Once its finished check it again with :

cat /proc/mdstat

If it still shows one drive as "_", you got problems and your RAID
array is running in degraded mode.

Jeremy Mann
jeremy at biochem.uthscsa.edu

University of Texas Health Science Center
Bioinformatics Core Facility
Phone: (210) 567-2672

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