swap on LVM

drManhattan · 08-04-2011, 03:58 AM

Hi

I wonder whether to place swap partition on LVM or on standard fdisk partition which will not be in LVM.

What is better and more often used on production ?

thx for help.

mpapet · 08-04-2011, 04:51 AM

Quote:

Originally Posted by drManhattan

Hi

I wonder whether to place swap partition on LVM or on standard fdisk partition which will not be in LVM.

What is better and more often used on production ?

thx for help.

For production, swap is on a RAID1,5,etc. You don't have to do that though. You can have multiple swap partitions and set priority on each of them. From there, the kernel manages swap.

drManhattan · 08-04-2011, 05:07 AM

But whether create pv volume and then lv volume with swap (e.g. /dev/mapper/root_vg-swap_lv)or use clean fdisk partition for swap (e.g. /dev/sda3 swap) ?

mpapet · 08-04-2011, 03:23 PM

Quote:

Originally Posted by drManhattan

But whether create pv volume and then lv volume with swap (e.g. /dev/mapper/root_vg-swap_lv)or use clean fdisk partition for swap (e.g. /dev/sda3 swap) ?

I like things simple. I would use fdisk to make your swap partitions and fstab to use and assign priority. To be clear, there's no right answer. IMHO, an LVM for swap is more to possibly go wrong.

Fantasio · 08-04-2011, 03:39 PM

I think swap on lvm is not the best deal you can do. In the case where the swap partition is too small, use a file to increase it.
theorically, if the swap is used than your system memory is too low and you have poor performances.