Re: [Xen-users] swapless pvm

[Bartosz Lis <bartoszl@xxxxxxxxxxxxx>]

Dnia wtorek, 10 listopada 2009 o 13:22:14 Longina Przybyszewska napisaÅ(a):
> What is the best practice in creating PVm domU's - with or without swap?
> 
> >From the admin point of view, especially in HA environment it is
> > temptating not to have
> 
> a seperate swap partition.
> 
> Could it be performance issue if swapping to swap-file insted of
> swap-partition?
> 
> What about pure swapless- no swapfile, no swap-partition?
> 
> Any expirence out there?
> 
> regards
> Longina
> 
Longina,

Swap partitions generally have better performance than swapfiles. Swapfile is 
a file in a filesystem, and you access it with an extra overhead generated by 
filesystem diver and filesystem structure.

I think, that the best practice is to create a number of LVM volumes and 
marshall it to your virtual machine as virtual scsi partitions (/dev/sda1, 
dev/sda2, ...) or xvd block devices. One of these volumes should be used as a 
swap partition.

Regards, pozdrÃwka,

-- 
Bartosz Lis @ Inst. of Information Technology, Technical Univ. of Lodz, Poland
   bartoszl @ ics.p.lodz.pl

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