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тАО09-20-2007 09:32 AM
тАО09-20-2007 09:32 AM
eva8000 can't keep up with management requests, help!
Basically, I want to batch create/destroy hundreds of vdisks and LUN presentations on a daily basis. The EVAs do not seem designed for my usage pattern, and they just fall over under the load.
So, anyone have ideas for how to avoid breaking it, and/or communication venues to report problems I've found?
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тАО09-20-2007 08:42 PM
тАО09-20-2007 08:42 PM
Re: eva8000 can't keep up with management requests, help!
is there a specific reason why you cannot re-use existing virtual disks?
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тАО09-21-2007 05:05 AM
тАО09-21-2007 05:05 AM
Re: eva8000 can't keep up with management requests, help!
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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тАО09-21-2007 05:19 AM
тАО09-21-2007 05:19 AM
Re: eva8000 can't keep up with management requests, help!
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тАО09-21-2007 07:07 AM
тАО09-21-2007 07:07 AM
Re: eva8000 can't keep up with management requests, help!
However, it seems to introduce quite a bit of complexity, and may only help a little. The bulk of the load is coming from I/O, and that won't change. It's common for I/O speeds to get as slow as 300KiB/s over a 4Gb/s link when a few people are hammering it at the same time.
Another option I'm considering is slowing down my SAN switches, untrunking them or downgrading port speeds... the idea being more load on the switches and less on the EVAs.
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тАО09-21-2007 08:04 AM
тАО09-21-2007 08:04 AM
Re: eva8000 can't keep up with management requests, help!
A container is an empty disk structure until it is used in a snapclone or mirrorclone. The EVA has "mapped" out the Psegs/Rstores ready for use.
Using containers would save a lot of overhead on the EVA as suggested above.
Using something like RSM to script/schedule this may be of use?
No need to delete recreate Vdisks, just umount and turn into a container - just re-use the containers.
Mark...
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тАО09-21-2007 09:24 PM
тАО09-21-2007 09:24 PM
Re: eva8000 can't keep up with management requests, help!
Why do you need to continually destroy the vdisk's? Do you need to erase the data or do you just need an "empty" disk/lun/volume?
What O/S are your hosts?
I can't fathom an app that you need to do such a quantity of those sort of operations on a daily basis.
There may be a way to do what you're doing at os level.
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тАО09-24-2007 05:45 AM
тАО09-24-2007 05:45 AM
Re: eva8000 can't keep up with management requests, help!
Yes, you can not convert a container directly back to a vdisk. They are to expedite the creation of snapshots, snapclones and mirrorclones. Which I suspect would play a key part in whatever Scott is trying to do.
Scott, what ARE you attempting to accomplish?
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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тАО09-24-2007 06:53 AM
тАО09-24-2007 06:53 AM
Re: eva8000 can't keep up with management requests, help!
I figured this would come up. No sane person would do this.
The answer is... testing servers. The EVA only serves to stress-test fiber channel, and LUNs are only needed for the duration of a test.
Unfortunately, I'm trying to break servers, not EVAs. :)
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тАО09-24-2007 08:05 AM
тАО09-24-2007 08:05 AM
Re: eva8000 can't keep up with management requests, help!
OK, I've seen some rather interesting tests in the past. The best was years ago. A friend was working on the OpenVMS system crash/cluster recovery code. He had one system configured to boot, join the cluster and then crash itself, all in a tight loop.
Anyway: You say "...LUNs are only needed for the duration of a test...." I've always been rather fussy about this when setting up a new EVA. LUNs only exist once the virtual disk is PRESENTED to a host. No presentation, no LUN. Which brings up the questions:
Can you reuse a virtual disk, and just present the vdisk for the duration of the test and unpresent after?
What would care if the virtual disk had already been used?
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company