On Feb 6, 2007, at 10:43 AM, Robert Milkowski wrote:
Hello eric,
Tuesday, February 6, 2007, 5:55:23 PM, you wrote:
IIRC Bill posted here some tie ago saying the problem with write
cache
on the arrays is being worked on.
ek> Yep, the bug is:
ek> 6462690 sd driver should set SYNC_NV bit when issuing SYNCHRONIZE
ek> CACHE to
ek> SBC-2 devices
Thanks. I see a workaround there (I saw it earlier but it doesn't
apply to 3510) and I have a question - setting zil_disable to 1
won't actually completely disable cache flushing, right? (still every
txg group completes cache would be flushed)??
Right, zil_disable is orthogonal to flushing the write cache. With
or without the ZIL, ZFS is consistent on disk. Disabling the
flushing of the write cache (as Neil just mentioned) *can cause
corruption*.
ek> The tricky part is getting vendors to actually support SYNC_NV
bit.
ek> If you your favorite vendor/array doesn't support it, feel free to
ek> give them a call...
Is there any work being done to ensure/check that all arrays Sun sells
do support it?
We're working it from our end, but i'm sure we won't cover all 3rd
party vendors...
eric
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