Richard Freeman on 10 Dec 2009 13:57:09 -0800

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

Re: [PLUG] LVM partition re-arrangement?

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 
Philadelphia Linux Users Group         --
Announcements -
General Discussion  --