topic Re: Load balancing in Operating System - HP-UX

Load balancing

Mah_1 — Thu, 26 Feb 2009 10:53:59 GMT

Hi sirs,

we recently migrated to hpux v3.can anybody tell how to set load balancing for disk in v3.
Previously we were using secure path in v2.

Re: Load balancing

Ganesan R — Thu, 26 Feb 2009 10:55:58 GMT

Hi Mahesh,

In HP-UX V3, load balancing will be taken care by OS/LVM itself by default.

No Need of secure path.

Re: Load balancing

Sani — Thu, 26 Feb 2009 10:57:04 GMT

Hi Mahesh,

In v3 you can use "scsimgr" command to set load balancing ploicy.

See the man page of "scsimgr"

Re: Load balancing

Mah_1 — Thu, 26 Feb 2009 12:29:29 GMT

Hi Sani

Thanks a lot .Can you please give syntax for scscimgr and also what policy to apply when ?

Re: Load balancing

Sani — Thu, 26 Feb 2009 12:39:59 GMT

Hi ,

to see current policy
#scsimgr get_attr -a load_bal_policy= -D /dev/rdisk/diskx

to set
#scsimgr set_attr -a load_bal_policy= -D /dev/rdisk/diskx

to save
#scsimgr save_attr -a load_bal_policy= -D /dev/rdisk/diskx

For more on policies see the man page.

Re: Load balancing

Torsten. — Thu, 26 Feb 2009 12:50:28 GMT

Get the info for a special disk:

scsimgr get_info -D /dev/rdisk/disk55

STATUS INFORMATION FOR LUN : /dev/rdisk/disk55

Generic Status Information

SCSI services internal state = ONLINE
Device type = Direct_Access
...
I/O load balance policy = round_robin
...

Re: Load balancing

Emil Velez — Fri, 27 Feb 2009 01:15:05 GMT

If you are using the disk with VxVM it does not yet use the agile device files and you have to use the vxdiskadm command to handle the vxvm use of the multiple paths.

Re: Load balancing

Mah_1 — Fri, 27 Feb 2009 07:43:19 GMT

Thanks a lot