I was frustrated with this problem for months. I've tried different
disks, cables, even disk cabinets. The driver hasn't been updated in
a long time.
When the timeouts occurred, they would freeze for about a minute or
two (showing the 100% busy). I even had the problem with less than 8
LUNs (and I'm seeing similar symptoms on another box connected to a
hardware RAID). I even swapped out controllers (for the same type - 3
of them, all Adaptec).
To fix it, I swapped out the Adaptec controller and put in LSI Logic
and all the problems went away.
On Jan 14, 2010, at 8:57 AM, Alexandru Pirvulescu wrote:
Any news regarding this issue? I'm having the same problems.
I'm using an external Axus SCSI enclosure (Yotta with 16 drives) and
it timed out on scanning LUNs (16 of them b/c Yotta is configured as
JBOD).
I've performed firmware upgrade to the Yotta system and now the
scanning works, the pool build works, I'm even able to perform some
transfers but after some time everything hangs, iostat shows 100%
busy on drives and timeouts in dmesg.
Still, if I keep the LUN number to <=8 everything works correctly. I
think that eliminates the problems of cabling or any other hardware
involved.
All the problems start when using >8 LUNs (sd.conf is configured
correctly, adpu320.conf is configured with maximum 16 LUNs).
Linux kernel 2.6.18 had the same problems in the past, but current
kernel works without any problem, so they've changed something in
the driver which eliminated the issue.
If any extra info is needed I'm ready to provide it.
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