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тАО10-16-2000 04:17 AM
тАО10-16-2000 04:17 AM
Thanks
Solved! Go to Solution.
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тАО10-16-2000 04:24 AM
тАО10-16-2000 04:24 AM
Re: Load Balancing under HP-UX
if you have devices with alternate links (ie: AutoRaid) you can control balancing at volume group creation time (vgcreate/vgextend).
Example:
Controller X: /dev/dsk/c1t0d0
Controller Y: /dev/dev/c3t0d0
Add one vg:
vgcreate vg01 /dev/dsk/c1t0d0
vgextend vg01 /dev/dsk/c3t0d0
This will result in vg01 has primary /dev/dsk/c1t0d0 and alternate /dev/dsk/c3t0d0
Add another vg:
vgcreate vg02 /dev/dsk/c3t0d0
vgextend vg02 /dev/dsk/c1t0d0
This will result in vg02 has primary /dev/dsk/c3t0d0 and alternate /dev/dsk/c1t0d0
So you can control I/O-balancing with the order of the device files when doing vgcreate/vgextend.
Regards
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тАО10-16-2000 04:30 AM
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тАО10-16-2000 04:37 AM
тАО10-16-2000 04:37 AM
Re: Load Balancing under HP-UX
However as the others have said, lvm will only use the alternate path should the primary fail.
Therefore you can help the system but alternating which path is the primary and alternate.
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тАО10-16-2000 04:41 AM
тАО10-16-2000 04:41 AM
Re: Load Balancing under HP-UX
if you have multiple disks within one vg you can use striping (and also mirroring = distributed striping+mirroring) to have I/O balancing.
Manually you can use the pvmove command for distributing the extends to different disks of the log. volumes.
Regards
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тАО10-16-2000 05:00 AM
тАО10-16-2000 05:00 AM
Re: Load Balancing under HP-UX
But I will throw this one out there. We have an EMC Disk Array, and have found that EMC offers a utility called, I believe, 'PowerPath'. What this does is allow the alternate link to become a second i/o channel for normal production. Basically it doubles i/o.
I know we're getting it on some new hardware coming in...and boy do I wish I had it currently on the production running today. ..sigh...
The point is - here is one vendor who has this type of service. So maybe you could check and see if your vendors have something comparable.
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тАО10-16-2000 07:00 AM
тАО10-16-2000 07:00 AM
Re: Load Balancing under HP-UX
Thanks.