Les Mikesell skrev:
Esben Laursen wrote:
Im currently testing vmware with OF.
I want the run my vmware server on a Debian Etch Linux and host the
guest OS'es on my OF. Im currently doing some performance testing
with both NFS and iSCSI.
I don't seem to get the performance I was looking for in my guest
OS'es. I have a read speed about 10Mbyte and a write speed that jumps
up to 30-40Mbyte in short periods. It seems like iSCSI is faster but
I cant figure out why. On both systems I cant seem to get a stable
throughput of over 10Mbyte. Without vmware I can get about 80Mbyte.
Have any of you guys played around with vmware server and host the
guest os'es on a OF nas/san?
I haven't tried that, but I've considered it and think it is a great
idea to only have to worry about the one physical host. There's bound
to be a certain amount of overhead in virtualizing the disk volumes
and it is probably worse if you don't pre-allocate the space. But,
if iscsi is better, why not use it for the active volumes? What kind
of speed do you get with vmware using an iscsi volume from the same
host (vmware tools might make a difference here)?
I far as I can test it does not matter if the space is preallocated or not.
vmWare does some caching that I want figure out, but as far as I can
tell the raw speed for both read and write is about 10Mbyte/sec.
Although when I create a new disk and preallocate the space it can do
about 80Mbyte/sec when doing that.
I tried to dd /dev/zero to a file about 8Gig big and it says that it
does that with 215Mbyte/sec. But it does not write it to the OF disks.
They almost do nothing. I dont know if vmware compresses the data before
it sends it to the physical disk.
When I tried IOmeter from Windows it gave me raw read/write speed of
about 20Mbyte/sec, although when it created the file it only did that
with about 10Mbyte/sec.
vmWare tools does not make a difference here as far as I can tell and
all my current test has been done with iSCSI.
Cheers
Esben
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