[linux-lvm] snapshot performance question
freemyer at NorcrossGroup.com
Wed Apr 9 17:22:01 UTC 2003
I currently have a 2 disk raid1 implemented via 3ware hardware raid.
The 3ware card makes the ide drives appear to be SCSI drives to the kernel, so SCSI disconnect logic/etc. is supported.
Currently I use unused space on the raid 1 array to hold my snapshot lv.
I also have a standalone ide 80 GB drive in the system with lots of unused space (~40GBs).
There are 2 contradictory performance statements that can be made:
1) raid 1 w/3ware should be much faster than a JBOD ide.
2) snapshots hosted on a separate physical media are faster.
Is this a clear cut case of moving my snapshot lv to the ide drive would be faster, or do I need to do performance testing to be sure?
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