HP VMA SAN Gateway for VMA-series Memory Arrays Release Notes - August 2012 - Software OE version G5.1.0

Table 3. HP-UX 11i v3 TPCC queue depth values.

IF THEN TPCC Setting is

I/Os are 4KB aligned and < 256KB 1024 / number of servers*

I/Os are 4KB aligned and > 256KB 512 / number of servers*

I/Os are NON-4KB aligned and < 256KB 512 / number of servers*

I/Os are NON-4KB aligned and > 256KB 256 / number of servers*

* where servers can be a whole physical server or a partition.

Linux

The Linux distros RHEL 5.7, 6.2, SLES 11 SP1 and OL 5.7 have been validated on the DL980 G7 server

with the HP VMA SAN Gateway software OE version G5.1.0 and connected VMA-series Memory

Arrays using firmware version A5.1.3. Additional limitations and considerations for Linux

environments are shared in the following subsections.

Recommended Multipath Settings

For Linux environments, it is recommended to change from the default settings for multipathing.

For heavily loaded I/O environments, such as with the VMA SAN Gateway, it has proven to be more

efficient to use the ‘tur’ checker method instead of the ‘readsector0’ or ‘directio’ alternatives to

check the health of lunpaths. An example multipath setting would be:

Recommended Multipath config file:

blacklist {

# modify blacklist and exceptions to suit

devnode "^sd[a-c]"

}

blacklist_exceptions {

devnode "sd[a-z][a-z]"

}

defaults {

user_friendly_names yes

fast_io_fail_tmo 5

dev_loss_tmo 30

checker_timeout 10

failback immediate

rr_weight uniform

# uncomment this for non-HA, it conflicts with queue_if_no_path

# no_path_retry fail

max_fds 8192

path_checker tur

# earler than RHEL6.2 use rr_min_io instead. Tune to workload

rr_min_io_rq 4

path_grouping_policy multibus

path_selector "round-robin 0"

}

devices {

device {

vendor "VIOLIN"

product "SAN ARRAY"

path_grouping_policy group_by_serial