On 10/6/2010 7:23 AM, Thijs wrote:
Hi.
Our hardware department is planning on moving some stuff to new
machines (on our request)
They are suggesting using virtualization (some CISCO solution) on
those machines and having the 'disk' connected via ISCSI.
Does anybody have experience running a SOLR index on a ISCSI drive?
We have already tried with NFS but that is slowing the index process
down to much, about 12 times slower. So NFS is a no-go. I could have
know that as it is mentioned on a lot of places to avoid nfs. But I
can't find info about ISCSI
Does anybody have experience running a SOLR index on a virtualized
environment? Is it resistant enough that it keeps working when the
virtualized machine is transfered to a different hardware node?
thanks
I've not actually used it myself, but I would not expect it to cause you
any issues. It should be similar to fibrechannel. Usually fibrechannel
is faster, unless you REALLY spend some money and get 10Gb/s ethernet
hardware. If we assume that you'll have a fairly standard gigabit setup
with only one port on your server, you should see potential speeds near
one gigabit. This is faster than the sustained rate on most single hard
drives. I was just reading that Seagate's 15K 600GB SAS drive is
171MB/s, which would get close to 1.3GB/s, so in that case, it could
overwhelm a single iSCSI port.
With something like iSCSI or fibrechannel, you have extra points of
failure, because you normally don't want to implement them without
dedicated switching hardware. The solution there is redundancy, which
of course drives the cost up even higher. You also usually get higher
speeds because of load balancing across those multiple links.
Shawn
