Hi Gerry,
So far the only problem we have had is with one Areca card that had a bad
2GB memory module. This generated lots of (correctable) single bit errors
but eventually caused real problems. Could you say something about the
reliability issues you have seen?
Cheers,
Bruce
On Wed, 16 Apr 2008, Gerry Creager wrote:
We've used AoE (CoRAID hardware) with pretty good success (modulo one RAID
shelf fire that was caused by a manufacturing defect and dealt with promptly
by CoRAID). We've had some reliability issues with Areca cards but no data
corruption on the systems we've built that way.
gerry
Bruce Allen wrote:
Hi Xavier,
PPS: We've also been doing some experiments with putting
OpenSolaris+ZFS on some of our generic (Supermicro + Areca) 16-disk
RAID systems, which were originally intended to run Linux.
I think that DESY proved some data corruption with such configuration,
so they switched to OpenSolaris+ZFS.
I'm confused. I am also talking about OpenSolaris+ZFS. What did DESY
try, and what did they switch to?
Sorry, I am indeed not clear. As far as I know, DESY found data corruption
using Linux and Areca cards. They moved from linux to OpenSolaris and ZFS,
avoiding other corruption. This has been discussed in HEPiX storage
workgroup. However, I can not speak on their behalf at all. I'll try to
get you in touch with someone more aware of this issue, as my statements
lack of figures.
I think that would be very interesting to the entire Beowulf mailing list,
so please suggest that they respond to the entire group, not just to me
personally. Here is an LKML thread about silent data corruption:
http://kerneltrap.org/mailarchive/linux-kernel/2007/9/10/191697
So far we have not seen any signs of data corruption on Linux+Areca systems
(and our data files carry both internal and external checksums, so we would
be sensitive to this).
Cheers,
Bruce
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