Re: Problem with lost iSCSI device under high IO load

Kevin Stange <kevin@xxxxxxxxxxxxx> · Wed, 27 Feb 2008 20:41:28 -0600

Kevin Stange wrote:

Mike Christie wrote:

Kevin Stange wrote:

Hello,

If I am fortunate enough to already have a shell, I can do things until
I attempt to perform IO, at which point the process hangs permanently
waiting for a response from the iSCSI device and I lose the ability to
use the shell in any form.

I was able to execute iscsi-ls and iscsi-rescan.  The former returned no
information,

Did iscsi-ls at least display the version info? If you do "ls
/sys/class/iscsi_transport" do you see some directories?

It printed its version, nothing else.  I will check the sysfs
information next time it happens.

I made an interesting revelation recently and have been testing for a 

while with good success, though the solution is another problem for us 

due to the purpose of the box.  We use reiserfs on the iscsi device and 

this problem goes away if I disable filesystem quotas (quotaoff or just 

never quotaon).  I had accidentally left quotas disabled for a few days 

at one point in time and then discovered that when I tried to turn them 

back on, the system failed almost immediately.

I then left quotas off for several weeks and the system has not had a 

single issue since then.  If anyone has any advice on why this might 

occur or how to fix it, I would appreciate it.

Kevin

--
Kevin Stange
Chief Technology Officer
Steadfast Networks
http://www.steadfast.net
kevin@xxxxxxxxxxxxx
Phone: 312-602-2689 ext. 203 | Fax: 312-602-2688 | Cell: 312-320-5867

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