Dennis Clarke wrote:
Dennis Clarke wrote:
While ZFS may do a similar thing *I don't know* if there is a published
document yet that shows conclusively that ZFS will survive multiple disk
failures.
?? why not? Perhaps this is just too simple and therefore doesn't get
explained well.
That is not what I wrote.
Once again, for the sake of clarity, I don't know if there is a published
document, anywhere, that shows by way of a concise experiment, that ZFS will
actually perform RAID 1+0 and survive multiple disk failures gracefully.
I do not see why it would not. But there is no conclusive proof that it will.
Will add it to the solarisinternals ZFS wiki.
For an easy proof, I created a RAID-1+0 set with ramdisks and clobbered
two of the ramdisks.
# zpool status rampool
pool: rampool
state: DEGRADED
status: One or more devices could not be opened. Sufficient replicas exist
for
the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
see: http://www.sun.com/msg/ZFS-8000-D3
scrub: resilver completed with 0 errors on Mon Oct 23 10:58:55 2006
config:
NAME STATE READ WRITE CKSUM
rampool DEGRADED 0 0 0
mirror DEGRADED 0 0 0
/dev/ramdisk/set1-0 ONLINE 0 0 0
/dev/ramdisk/set1-1 UNAVAIL 0 0 0 cannot open
mirror DEGRADED 0 0 0
/dev/ramdisk/set2-1 ONLINE 0 0 0
/dev/ramdisk/set2-0 UNAVAIL 0 0 0 cannot open
errors: No known data errors
#
-- richard
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