Hi,
I have a set of 11 500 GB drives. Currently each has two 250 GB
partitions (/dev/sd?1 and /dev/sd?2). I have two RAID6 arrays set up,
each with 10 drives and then I wanted the 11th drive to be a hot-spare.
When I originally created the array I used mdadm and only specified
the use of 10 drives since the 11th one wasn't even a thought at the
time (I didn't think I could get an 11th drive in the case). Now I can
manually add in the 11th drive partitions into each of the arrays and
they show up as a spares but on reboot they aren't part of the set
anymore. I have added them into /etc/mdadm.conf and the partition type
is set to be Software RAID (fd).
Maybe I shouldn't be splitting the drives up into partitions. I did
this due to issues with volumes greater than 2TB. Maybe this isn't an
issue anymore and I should just rebuild the array from scratch with
single partitions. Or should there even be partitions? Should I just
use /dev/sd[abcdefghijk] ?
On a side note, maybe for another thread, the arrays work great until a
reboot (using 'shutdown' or 'reboot' and they seem to be shutting down
the md system correctly). Sometimes one or even two (yikes!) partitions
in each array go offline and I have to mdadm /dev/md0 -a /dev/sdx1 it
back in. Do others experience this regularly with RAID6? Is RAID6 not
ready for prime time?
As for system information, it is (was) a Dual Opteron with CentOS 4.3
(now I'm putting FC5 on it as I write) with a 3Ware 8506-12 SATA RAID
card that I am using in JBOD mode so I could do software RAID6.
Thanks for your help.
Steve
--
______________________________________________________________________
Steve Cousins, Ocean Modeling Group Email: cousins@xxxxxxxxxxxxxx
Marine Sciences, 452 Aubert Hall http://rocky.umeoce.maine.edu
Univ. of Maine, Orono, ME 04469 Phone: (207) 581-4302
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
