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List:       zfs-discuss
Subject:    Re: [zfs-discuss] Add SSD drive as L2ARC(?) cache to existing ZFS
From:       Greg Mason <gmason () msu ! edu>
Date:       2009-01-29 16:25:23
Message-ID: 4981D873.2090400 () msu ! edu
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How were you running this test?

were you running it locally on the machine, or were you running it over 
something like NFS?

What is the rest of your storage like? just direct-attached (SAS or 
SATA, for example) disks, or are you using a higher-end RAID controller?

-Greg

kristof wrote:
> Kebabber,
> 
> You can't expose zfs filesystems over iSCSI.
> 
> You only can expose ZFS volumes (raw volumes) over iscsi.
> 
> PS: 2 weeks ago I did a few tests, using filebench.
> 
> I saw little to no improvement using a 32GB Intel X25E SSD.
> 
> Maybe this is because filebench is flushing the cache in between tests.
> 
> I also compared iscsi boot time (using gpxe as boot loader) ,
> 
> We are using raidz storagepool (4disks). here again, adding the X25E as cache \
> device did not speedup the boot proccess. So I did not see real improvement.  
> PS: We have 2 master volumes (xp and vista) which we clone to provision additional \
> guests.  
> I'm now waiting for new SSD disks (STEC Zeus 18GB en STEC Mach 100GB.), since those \
> are used in SUN 7000 product. I hope they perform better. 
> Kristof
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