Re: [zfs-discuss] Poor iSCSI performance [SEC=PERSONAL]

[Roch Bourbonnais]

-r

Le 25 août 09 à 08:38, Duncan Groenewald a écrit :

Unlike NFS which can issue sync writes and async writes, iscsi needs to be serviced with synchronous semantics (unless the write caching is enabled, caveat emptor). If the workloads issuing the iscsi request is single threaded, then performance is governed by I/O size over rotational latency and that is often dismall. Some form of solid state acceleration becomes a must for iscsi and is very often of benefit for NFS.

On Aug 24, 2009, at 10:02 PM, "LEES, Cooper"
<c...@ansto.gov.au> wrote:

Hi Duncan,

I also do the same with my Mac for timemachine and

get the same WOEFUL

performance to my x4500 filer.

I have mounted ISCSI zvols on a linux machine and

it performs as

expected
(50 mbytes a second) as apposed to my Mac that goes

@ 1mbyte a

second. I do
believe the client for Mac is crap. Would be nice

if apple wrote a

client
for ISCSI.

But if anyone has a fix for Mac OS X that would be

great to know !

You know you can do time machine on NFS. An SSD drive
will also go a
long way too, you really on need a 16GB one for an
slog.

-Ross

Thanks
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How do you set it up under NFS ? I managed to get one of my Macs to backup to a ZFS share but this is a smb share not an NFS share. Can you post details on how to use an NFS share for time machine. iSCSI seems to be very easy to setup but is way too slow to be useful.

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