On Tue, 22 Aug 2006, Steve Cousins wrote:
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
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If you are using SW RAID, there is no 2TB limit.
Justin.
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