On 18-Nov-06, at 2:01 PM, Bill Moore wrote:
Hi Michael. Based on the output, there should be no user-visible file
corruption. ZFS saw a bunch of checksum errors on the disk, but was
able to recover in every instance.
While 2-disk RAID-Z is really a fancy (and slightly more expensive,
CPU-wise) way of doing mirroring, at no point should your data be at
risk.
I've been working on ZFS a long time, and if what you say is true, it
will be the first instance I have ever seen (or heard) of such a
phenomenon. I strongly doubt that somehow ZFS returned corrupted data
without knowing about it.
Also, I'd check your RAM.
--Toby
How are you sure that some application on
your box didn't modify the contents of the files?
--Bill
On Sat, Nov 18, 2006 at 02:01:39AM -0800, [EMAIL PROTECTED]
wrote:
I'm new to this group, so hello everyone! I am having some issues
with my Nexenta system I set up about two months ago as a zfs/
zraid server. I have two new Maxtor 500GB Sata drives and an
Adaptec controller which I believe has a Silicon Image chipset.
Also I have a Seasonic 80+ power supply, so the power should be as
clean as you can get. I had an issue with Nexenta where I had to
reinstall, and since then everytime I reboot I have to type
zpool export amber
zpool import amber
to get my zfs volume mounted. A week ago I noticed a couple of
CKSUM errors when I did a zpool status, so I did a zpool scrub.
This is the output after:
# zpool status
pool: amber
state: ONLINE
status: One or more devices has experienced an unrecoverable
error. An
attempt was made to correct the error. Applications are
unaffected.
action: Determine if the device needs to be replaced, and clear
the errors
using 'zpool clear' or replace the device with 'zpool
replace'.
see: http://www.sun.com/msg/ZFS-8000-9P
scrub: scrub completed with 0 errors on Mon Nov 13 04:49:35 2006
config:
NAME STATE READ WRITE CKSUM
amber ONLINE 0 0 0
raidz1 ONLINE 0 0 0
c4d0 ONLINE 0 0 51
c5d0 ONLINE 0 0 41
errors: No known data errors
I have md5sums on a lot of the files and it looks like maybe 5% of
my files are corrupted. Does anyone have any ideas? I was under
the impression that zfs was pretty reliable but I guess with any
software it needs time to get the bugs ironed out.
Michael
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