Permanent iSCSI disk timeouts on DataCore SANsymphony-V 9 using udev rules

This document (7015055) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 11
SUSE Linux Enterprise Server 11 Service Pack 3 (SLES 11 SP3)
SUSE Linux Enterprise Server 11 Service Pack 2 (SLES 11 SP2)
SUSE Linux Enterprise Server 11 Service Pack 1 (SLES 11 SP1)

Situation

This article will explain how to configure appropriate udev rules to set a certain iSCSI disk timeout for DataCore SANsymphony-v 9.

Resolution

Temporary:

To change the timeout use:

echo 80 > /sys/block/[disk_device]/device/timeout

Keep in mind this setting will be lost upon next reboot.

Permanent:

Example udev rule for IBM 2145:

udev rules file cat /etc/udev/rules.d/99-ibm-2145.rules

# Set SCSI command timeout to 120s (default == 30 or 60) for IBM 2145 devices
SUBSYSTEM=="block", ACTION=="add", ENV{ID_VENDOR}=="IBM", ENV{ID_MODEL}=="2145", RUN+="/bin/sh -c 'echo 120 > /sys/block/%k/device/timeout'"

To gather information on "ID_VENDOR" and "ID_MODEL" run a :

"udevadm info --query=all --attribute-walk --name=/dev/device"

where "device" is the iSCSI disk. Returned values for DataCore are:

ATTRS{vendor}=="DataCore"

ATTRS{model}=="Virtual Disk"

Resulting in the following udev rule:

/etc/udev/rules.d/99-datacore.rules

ACTION=="add", SUBSYSTEM=="block", ATTRS{vendor}=="DataCore", ATTRS{model}=="Virtual Disk ", RUN+="/bin/sh -c 'echo 80 > /sys/block/%k/device/timeout'"

Cause

Additional Information

DataCore howto for setting the iSCSI disk timeout:
http://datacore.custhelp.com/ci/fattach/get/212933/1399653078/redirect/1/filename/Host_Configuration_Guide_Linux.pdf

Disclaimer

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