Date: Fri, 11 Jun 2010 17:17:32 +0200 From: Rolf Grossmann <rg@xamine.com> To: freebsd-scsi@freebsd.org Subject: ZFS reports problem on iscsi target Message-ID: <4C12538C.9000400@xamine.com>
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Hi,
I'm having some trouble with iscsi on FreeBSD 8. My current setup is a
stock FreeBSD 8.1-PRERELEASE (as of 2 days ago), GENERIC kernel with
some modules loaded, running on a Dell PowerEdge R905 with 64GB RAM, 4
quad code CPUs. Attached is an EqualLogic PS6500 storage array with some
configured volumes, one of which is for testing. It is configured in
/etc/iscsi.conf like this:
test2 {
TargetName=iqn.2001-05.com.equallogic:0-8a0906-7a4bb9f06-038000000304c0d1-test2
TargetAddress=10.26.17.10:3260,1
tags = 256
}
Now I'm running the following sequence of commands (shown with output):
# iscontrol -n test2
iscontrol[56255]: running
iscontrol[56255]: (pass2:iscsi0:0:0:0): tagged openings now 256
iscontrol[56255]: cam_open_btl: no passthrough device found at 2:0:1
iscontrol[56255]: cam_open_btl: no passthrough device found at 2:0:2
iscontrol[56255]: cam_open_btl: no passthrough device found at 2:0:3
iscontrol: supervise starting main loop
# zpool create test2 da2
# zpool scrub test2
# zpool status test2
pool: test2
state: ONLINE
scrub: scrub completed after 0h0m with 0 errors on Fri Jun 11 16:56:33 2010
config:
NAME STATE READ WRITE CKSUM
test2 ONLINE 0 0 0
da2 ONLINE 0 0 0
errors: No known data errors
# cp -Rp /export/system /test2/
# zpool scrub test2
# zpool status test2
pool: test2
state: ONLINE
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
see: http://www.sun.com/msg/ZFS-8000-8A
scrub: scrub completed after 0h0m with 19 errors on Fri Jun 11 17:00:38
2010
config:
NAME STATE READ WRITE CKSUM
test2 ONLINE 0 0 19
da2 ONLINE 0 0 38
errors: 19 data errors, use '-v' for a list
#
/export/system is a FreeBSD distribution (make install
DESTDIR=/export/system). Note how zfs thinks there are 19 files broken
after the copy. If I repeat the process, the files vary, but there are
always some reported as broken. In this case, they don't seem to be (as
checked with md5 and rsync --checksum), but I've had files only giving
me an i/o error. Also, if I repeat the same steps on a local disk, zfs
is reporting no errors.
What I would like to know is:
- Is there anything I'm doing wrong? Is there a known problem?
- Are there any tools to debug or more reliably reproduce (and narrow
down) the problem? I've tried fsx (from /usr/src/tools/regression), but
I couldn't find any usage suggestions (other than the usage when run
without options) and it doesn't complain when run.
- On a different system I've tried using a newer iscsi version from
http://www.cs.huji.ac.il/~danny/ftp/freebsd/ but it didn't make any
difference. Is that still preferable?
Some help would be appreciated.
Thanks, Rolf.
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