hum, some doubts....
what´s better (faster / secure)?
swap over one disk (no raid)
swap over one md raid1
swap over one md raid0
swap over one md raid10
swap over one md raid5
swap over one md raid6



2011/4/19 Steven Haigh [off-list ref]:

On 20/04/2011 7:10 AM, Gordon Henderson wrote:

quoted

I'm actually of the opinion that to NOT put swap on RAID in an otherwise
RAIDed system is just plain silly. Do it. You know it makes sense!

I think the preferred method at the moment (and at least for 2010/2011) is
to have a smallish RAID1 partition for /boot then create a second RAID array
for everything else and use LVM on top of that.

That allows you to have the host on the same RAID1 and use the flexibility
to use LVM for all your other requirements.

I personally run a Xen virtualisation server - it has the following:
/dev/md0 - /boot - 512Mb - RAID1
/dev/md1 - VG 'RAID1' - rest of disk - RAID1
/dev/md2 - VG 'RAID5' - 3 x 1Tb whole disks - RAID5

Then the majority of the 7 VMs on that machine live on the RAID5 VG (with
one special case that is on the RAID1 VG) and it runs very happily.

The swap and root of Dom0 is on the RAID1 VG. This seems to be the best way
I've found to have the most flexibility and not have to change things as
time progresses.

--
Steven Haigh

Email: netwiz@crc.id.au
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Roberto Spadim
Spadim Technology / SPAEmpresarial
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