On Sat, 18 Sep 2010, Heinrich wrote:
I SAN boot my systems and this block volume is a windows install,
windows boot and run fine. it does however indicate that the disk
has a bad block in event viewer. I have been running this setup
since build 99 and boot CentOS, win2k8 and Vista/7 from it. ZFS is
now unable to get data from the mirror but was able to write it
before, so I assume this is either a controller/system fault, disk
fault or a ZFS fault? Could a client side FC driver/HBA fault cause
this? I did a full scrub of the pool twice. 1st only zlun02 showed
up. then I accessed zlun03 via the windows 7 install running on
zlun02 and now it shows as a problem also.
It is very unusual to obtain the same number of errors (probably same
errors) from two devices in a pair. This should indicate a common
symptom such as a memory error (does your system have ECC?),
controller glitch, or a shared power supply issue.
My real question here is how can I make a backup/move of the block
volume zlun02 via ZFS or is this impossible. Due to licensing on
some software it is a real nightmare to reinstall (once I found out
what the problem is) I tried making a snapshot of the fs and tried
to use zfs send/recv, but this fails as can be expected. Any ideas
would be welcomed. Also if anyone knows of a tool I can use to test
It seems like you could use 'dd' with the 'noerror' option and "sync
conversion" to do a low-level copy of the data:
noerror Does not stop processing on an input
error. When an input error occurs, a
diagnostic message is written on stan-
dard error, followed by the current
input and output block counts in the
same format as used at completion. If
the sync conversion is specified, the
missing input is replaced with null
bytes and processed normally. Otherwise,
the input block will be omitted from the
output.
The copy could be to a new zvol in the same pool (assuming you trust
the disks) or you could pipe it over ssh to another 'dd'.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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