I have a kvm virtual host running on what will become CentOS 6 with 12GB
of memory and a Quad Xeon X5560 2.8Ghz . The store for virtual
machines will be a software raid 6 array of 6 disks with an LVM layered
on top. I'm not initially planning any major overcommitment of
resources, though there could be a need for some overcommitment with a
light workload on the guests.
In recent years people seem to configure a wide range of different swap
allocations. I was thinking initially to spread swap across seperate
non-raid partitions on 4 of these disks, but the downside of that is if
I put 2gb on each disk, then I can only swap processes that will fit in
2gb swap space. Also, if one of the disks fails, I have to reboot if
anything was swapped to that drive.
My questions are as follows:
1. What experience are others having with putting swap space on raid
partitions? I was thinking about maybe swapping on a raid10
device, otherwise an LVM spanning multiple drives.
2. In practice, what kinds of swap allocation are people finding
useful for a kvm virtual host of this size?
I definitely don't want a system that is so overcommited that
performance is impacted, but if some overcommitment is reasonable for
VM's that have light workload, then I consider that. I can increase
system resources when that becomes necessary.
Nataraj
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