Erik Trimble wrote:
I'm just wondering if anyone has tried this, and what the performance
has been like.
Scenario:
I've got a bunch of v20z machines, with 2 disks. One has the OS on it,
and the other is free. As these are disposable client machines, I'm not
going to mirror the OS disk.
I have a disk server with a striped mirror zpool, carved into a bunch of
zvols, each exported via iSCSI. I mount one of these iSCSI zvols on
each v20z client.
What I'm wondering is this: if, on the client v20z, I make a zpool of
the iSCSI volume, what kind of performance impact would I have if I add
the second local disk as either (or perhaps both) a ZIL or L2ARC
I wouldn't recommend using it as a ZIL because then you don't get to
import that pool on another physical machine. There could be needed
data on the ZIL.
caching device? These are speedy 15k SCSI drives.
I realize that if I have to migrate the iSCSI zvol off the original
client, I lose access to my cache device, but that's OK.
Right, because the cache isn't even currently persistent accross a
reboot (or pool export) anyway.
> I'm just
thinking in terms of performance. I guess what it boils down to is what
is the access time/throughput of a single local 15k SCSI drive vs a GigE
iSCSI volume?
For the L2ARC it is worth at try - what have you got to loose since you
can remove the cache device really easily.
--
Darren J Moffat
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