Load balancing

[Mah_1]

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.

[Ganesan R]

Hi Mahesh,

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

No Need of secure path.

[Sani · Accepted solution]

Hi Mahesh,

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

See the man page of "scsimgr"

[Mah_1]

Hi Sani

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

[Sani]

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.

[Torsten.]

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
...

[Emil Velez]

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.

[Mah_1]

Thanks a lot