From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 89531] New: mpt2sas: only every second disk working with PCIe
x4 connection
Date: Wed, 10 Dec 2014 18:36:38 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=89531
Bug ID: 89531
Summary: mpt2sas: only every second disk working with PCIe x4
connection
Product: SCSI Drivers
Version: 2.5
Kernel Version: 3.16.5
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: blocking
Priority: P1
Component: Other
Assignee: scsi_drivers-other@kernel-bugs.osdl.org
Reporter: abusse@cs.tu-berlin.de
Regression: No
Created attachment 160351
--> https://bugzilla.kernel.org/attachment.cgi?id=160351&action=edit
syslog
I have an SAS controller with LSI SAS 2008 controller in a PCIe slot with only
four lanes where the card can use up to eight lanes. I have the following
issue. Lets assume there are four drives attached to the controller
(sda...sdd). I use the following simple benchmark "cat /dev/sdX | pipebench >
/dev/null". When accessing every drive individually, every thing works fine.
However when I run the experiment on sda and sdb concurrently, it still works
on sda but the benchmarks stalls on sdb. When I kill the benchmark after some
seconds I see the error messages in the attachment.
However, it gets more strange. When I run the benchmark concurrently on sda and
sdc every thing works as expected. When trying to read sdb or sdd concurrently
it always results in the error described above.
I also tried to change the hardware setup and only used every second connection
of the card. However the result stayed the same: concurrent access to every
second disk fails.
In the same machine I have the same SAS controller model in a PCIe x16 slot and
there every thing works like a charm. I also swaped the cards and the issue
stays with the PCIe x4 slot. So a defective card as the source of the problem
can be ruled out.
Thank you
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