Friday, January 16, 2015

HP-UX 11iv3/11.31 disk congestion control/throttling

HP-UX 11.31 includes some new parameters available via scsimgr.  These parameters are for disk congestion control, based on a maximum queue depth for the target port.

This document includes details on how the congestion control works.
HP-UX 11i v3 Congestion Control Management for Storage

On my production systems, I mainly just want to ensure its disabled :-)

If this lil awk returns a bunch of nuthin' except target path instance numbers, its not enabled.

sasquatch dimaggio:/home/sasquatch> for tgtp in `ioscan -kfNCtgtpath | awk 'NR>2 {print $2}'`; do echo $tgtp":\c"; scsimgr -p get_attr -C tgtpath -I $tgtp -a tport_qdepth_enable -a tport_max_qdepth -a tport_qd_dyn ; done

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