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Re: [PLUG] LVM partition re-arrangement?
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On 12/10/2009 02:35 PM, Mike Sheinberg wrote:
>I'm probably gonna dd the drive before-hand
Never a bad thing if you can spare the space! Note that unless you use
an LVM snapshot or do it offline you could run into issues with a
restore since the disk will change as you back it up.
> I don't mind adding the new drive to the old volume group if
> that's the most straight-forward approach and doesn't cause any
> performance degradation.
You might give some thought to which partitions end up on the same disks
if you care about performance. Obviously the head can only be in one
place at one time, so if you can evenly split up accesses across drives
that will maximize performance. Another approach is that if you have
one app that REALLY needs priority you can put its data on its own
disks, and then it will never compete for seeks. I had a mix of 5400
and 7200RPM drives so I also had to take some care not to slow down
stuff by splitting reads across both drives (ie don't RAID them
together). For most normal users, there really isn't anything to worry
about.
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