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Driver parameter setting when
SCSI-MQ feature at Linux is
enabled
This chapter explains how to enable SCSI-MQ feature supported by SUSE Linux
Enterprise Server and how to setup the driver parameter for SCSI-MQ feature.
SCSI-MQ feature in Linux OS
About SCSI-MQ feature
From SLES12SP2 SCSI-MQ feature with multiple hardware queues for one SCSI
device has been supported. This feature improves the performance by increasing
parallelism of I/O to SCSI devices with using multiple hardware queues. The following
table shows that multi queue function is supported in SLES12SP2 or later version. If
you enable SCSI-MQ feature on the OS that does not support SCSI-MQ feature, the
OS may fail to boot.
OS version
SLES12SP1 or earlier version
SLES12SP2 or later version
Whether default of SCSI-MQ feature setting is enabled or disabled depends on the kernel
version. To confirm whether default of SCSI-MQ feature setting is enabled or disabled,
please check with the following procedures.
# cat /sys/module/scsi_mod/parameters/use_blk_mq
Y [SCSI-MQ feature is enabled.]
N [SCSI-MQ feature is disabled.]
SCSI-MQ feature
Not supported
Supported
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