please Cc: me, I am not subscribed to freebsd-scsi
Sossi Andrej wrote:
>> On 16. 12. 2009 15:57, Miroslav Lachman wrote:
>> [...]
>> I use MD300i with FreeBSD 7.0 and 7.1 with iscsi-2.2.2. It work fine.
>> But be careful to configure MD3000i. MD3000i assign by default first
>> disk to preferred controller 0, second disk to preferred controller 1,
>> third disk to preferred controller 0, and so on. First, third, fifth...
>> disks is usable from FreeBSD, but second, fourth,... disks result
unusable.
>> Work around: manually assign all disks to controller 0.
>
> When you say "unusable" do you mean you can't access it at all / it
> errors even if it's the only path (drive) used? It would be normal if
> you have for example two paths to each drive and can't mount the other
> path if one path to the drive is mounted - this is not a usable
> combination. You can use geom_multipath to get multipath failover.
I got errors even in unmounted state.
I tried iscsi-2.2.3 and got same errors. I tried second path first
(device da0) and it produces same errors, then I run iscontrol for the
first path (device da1) and everything is fine.
---- path throught second controller: ERROR ----
# diskinfo -t /dev/da0
/dev/da0
512 # sectorsize
2998998663168 # mediasize in bytes (2.7T)
5857419264 # mediasize in sectors
364607 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: diskinfo: read error or disk too small for
test.: Invalid argument
---- path throught first controller: OK ----
# diskinfo -t /dev/da1
/dev/da1
512 # sectorsize
2998998663168 # mediasize in bytes (2.7T)
5857419264 # mediasize in sectors
364607 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 2.483517 sec = 9.934 msec
Half stroke: 250 iter in 2.575778 sec = 10.303 msec
Quarter stroke: 500 iter in 2.926170 sec = 5.852 msec
Short forward: 400 iter in 0.916901 sec = 2.292 msec
Short backward: 400 iter in 2.181790 sec = 5.454 msec
Seq outer: 2048 iter in 0.520920 sec = 0.254 msec
Seq inner: 2048 iter in 0.545300 sec = 0.266 msec
Transfer rates:
outside: 102400 kbytes in 1.414997 sec = 72368
kbytes/sec
middle: 102400 kbytes in 1.454444 sec = 70405
kbytes/sec
inside: 102400 kbytes in 1.422527 sec = 71985
kbytes/sec
Do you have experiences with iSCSI multipath? I read about geom_fox and
gmultipath...
Miroslav Lachman
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