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Load balancing

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Mah_1
Occasional Contributor

Load balancing

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.

7 REPLIES
Ganesan R
Honored Contributor

Re: Load balancing

Hi Mahesh,

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

No Need of secure path.
Best wishes,

Ganesh.
Sani
Frequent Advisor
Solution

Re: Load balancing

Hi Mahesh,

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

See the man page of "scsimgr"


Mah_1
Occasional Contributor

Re: Load balancing

Hi Sani

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

Sani
Frequent Advisor

Re: Load balancing

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.
Acclaimed Contributor

Re: Load balancing

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
...

Hope this helps!
Regards
Torsten.

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Emil Velez
Honored Contributor

Re: Load balancing


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
Occasional Contributor

Re: Load balancing

Thanks a lot