On Apr 23, 2007, at 10:56 AM, Andy Lubel wrote:
What I'm saying is ZFS doesn't play nice with NFS in all the
scenarios I could think of:
-Single second disk in a v210 (sun72g) write cache on and off =
~1/3 the performance of UFS when writing files using dd over an NFS
mount using the same disk.
If the write cache is enabled using UFS then its not a fair
comparison as UFS is open to corruption then.
ZFS write cache enabled vs. UFS write cache disabled is a fair
comparison. ZFS will enable the write cache be default if it owns
the whole disk (something to watch out for when doing successive
tests - say doing UFS after ZFS as the caches will be enabled w/out
you explicitly doing it).
-2 raid 5 volumes composing of 6 spindles each taking ~53 seconds
to write 1gb over a NFS mounted zfs stripe,raidz or mirror of a
storedge 6120 array with bbc, zil_disable'd and write cache off/
on. In some testing dd would even seem to 'hang'. When any
volslice is formatted UFS with the same NFS client - its ~17 seconds!
Can you show the output to 'zpool status' for ZFS and the
corresponding SVM/UFS setup?
eric
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