Be aware that RHEL5.5 still has this bug.
http://www.issociate.de/board/post/455533/RAID6_mdadm_--grow_bug?.html
Peter Ruprecht wrote:
Hi everyone,
I could use a little advice. I'm considering setting up a 16-disk
software RAID-6 system for use as a samba fileserver. The disks would
be 2TB SATA in an external enclosure attached via SAS to the server
(RHEL5, 2x Xeon E5420 processors with 4 cores, 16 GB RAM).
I have done software RAID-5 with 6 disks and gotten satisfactory
performance, but has anyone else tried SW RAID on a bigger scale?
Would that just be nuts?
So why not just buy a HW RAID system? Well, in this case cost is a big
issue. Also, in the past I've had some issues with RAID controllers
freaking out leaving all the data inaccessible, which I think is less
likely with SW RAID.
Finally, is there a reasonable RH-compatible alternative to xfs for a
16TB+ filesystem? Or is xfs now less iffy than it was a few years ago?
Thanks in advance,
Peter Ruprecht
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