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February 23rd, 2007 02:00
Disk Backup Advise
Hi,
I have two disk volumes provided to me from a SAN storage for backups. We want to backup two groups at a time. What we have done is configured both of them as independent devices with one group marked for /backup1 and the second one for /backup2.
We have also configured automatic staging with high watermak of 70% and low watermark of 30%. Whenever, staging happens it starts working on /backup1 first but during this time if /backup2 is getting full, the backups stop. Even if we do manual staging for /backup2 and then /backup1 gets full - we are in trouble.
We are therefore planning to stage everything from the two devices to tapes, merge the two drives, create two folders there and configure them as devices. We would be able to run two groups and whichever one we stage woill create space that can then be used by either of them.
Is this a good way tor esolve this? Would this bring in some performance issues along with it?
I have two disk volumes provided to me from a SAN storage for backups. We want to backup two groups at a time. What we have done is configured both of them as independent devices with one group marked for /backup1 and the second one for /backup2.
We have also configured automatic staging with high watermak of 70% and low watermark of 30%. Whenever, staging happens it starts working on /backup1 first but during this time if /backup2 is getting full, the backups stop. Even if we do manual staging for /backup2 and then /backup1 gets full - we are in trouble.
We are therefore planning to stage everything from the two devices to tapes, merge the two drives, create two folders there and configure them as devices. We would be able to run two groups and whichever one we stage woill create space that can then be used by either of them.
Is this a good way tor esolve this? Would this bring in some performance issues along with it?
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ble1
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February 23rd, 2007 02:00
amediratta
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February 26th, 2007 18:00
check interval is ofetn enough to catch when file
system is getting full. Time between high2low
watermark staging should be such that is less than
time needed for file device to fill to 90% since last
check. In your case you should calculate it and
probably you will either need lower your HWM or
increase LWM.
Please elaorate more. I think my understaning towards HWM & LWM is worng. I have been assuming that a HWM of 80% would mean that staging would start automatically when the disk space of 80% has been utilized and then it would stage data till it reaches the LWM.
What is the role of check interval in this?
ble1
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February 27th, 2007 13:00