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тАО04-27-2009 10:58 PM
тАО04-27-2009 10:58 PM
What would be the best option for the swap of a VM ?
Currently the swap is on the boot disk and I don't like that because this disk is a mirrored SAN LUN and I think that my I/Os should be used for more productive operations than copying the swap datas on a remote site...
I have the following options :
- Create a non replicated LUN and assign it to my VM.
- Use a local (on the host f/s) file and present it as a disk to the VM.
If you have other options, let me know.
Thanks
Patrick
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тАО04-27-2009 11:15 PM
тАО04-27-2009 11:15 PM
Re: Swap location in VM
A SAN can even be faster than a local SCSI connection.
Hope this helps!
Regards
Torsten.
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тАО04-27-2009 11:21 PM
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тАО04-27-2009 11:50 PM
тАО04-27-2009 11:50 PM
Re: Swap location in VM
if you don't have a Serviceguard configuration (the VM does not fail over to the remote site), then you're right stating that replication of the VM swap is just a waste of I/O.
Both of your options as you have mentioned them are possible. If you have enough diskspace on your VM host's local disks then use it. Just don't swap into a file, rather use raw disks or logical volumes as backing stores for VM swap.
If you are lacking local disk space or if you have a SAN that clearly outperforms your local SCSI disks, then go for the SAN LUN option. Again, use a raw device or a logical volume as a backing store. From performance standpoint, it is better to avoid the filesystem overhead.
HTH,
J.
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тАО04-28-2009 01:02 AM
тАО04-28-2009 01:02 AM
Re: Swap location in VM
Thanks for your fast and clear answers, I'll go with the SAN LUN option because the guy that installed the host did not leave any free space.
Patrick