HP StorageWorks Enterprise Virtual Array Online Firmware Upgrade Best Practices (5697-6388, January 2007)

Default timeou

tvalues

• Sdisk timeout: 30 seconds

• (LVM) lvol tim

eout: 0 seconds

Checking timeout values

• Device within a LVM volume group: pvdisplay /dev/dsk/cxtxdx

• lvol physical volume with an LVM g roup: lvdisplay /dev/vgxx/lvolx

Changing timeout values

Pvchange -t (

seconds) /dev/dsk/cxtxdx

Linux

The following conﬁguration recommendations apply to both RedHat and SUSE.

QLogic Driver parameters (failover enabled):

• qdepth = 16

• port_down_retry_count = 30

• login_retry_count = 30

• failover = 1

• load_balancing = 1

• excludemodel = 0x0

• auto_r estore = 0xA6

QLogic Driver parameters (single path) :

• qdepth = 16

• port_down_retry_count = 64

• login_retry_count = 30

• failover = 1

• load_balancing = 1

• excludemodel = 0x0

• auto_r estore = 0xA6

Emulex Driver parameters (single path)

• HPELXLPFC=y

• nodev_timeout=60

• qdepth=30

• discovery_threads=1

To check or set Linux parameters, use the set_parm executable found in the /opt/hp/<driver-

specific> directory. When executed, the options to change tim eo ut values are d isplayed.

NOTE:

• The timeout values must be increased for Emulex single path (without multipath support) and QLogic

single path being used in the environment. This is not only important for online upgrades but for

general data integrity.

• On line controller ﬁrmware upgrades are supported with Linux boot devices.

Evaluating the SAN for an online upgrade