The last couple times i've read this questions, people normally responded with:
It depends.... you might not even NEED a slog, there is a script floating around which can help determine that... If you could benefit from one, it's going to be IOPS which help you....so if the usb drive has more iops than your pool configuration does, then it might give some benefit.....but then again, usb might not be as safe either, and if an older version you may want to mirror it. On Tue, May 25, 2010 at 8:11 AM, Kyle McDonald <kmcdon...@egenera.com>wrote: > Hi, > > I know the general discussion is about flash SSD's connected through > SATA/SAS or possibly PCI-E these days. So excuse me if I'm askign > something that makes no sense... > > I have a server that can hold 6 U320 SCSI disks. Right now I put in 5 > 300GB for a data pool, and 1 18GB for the root pool. > > I've been thinking lately that I'm not sure I like the root pool being > unprotected, but I can't afford to give up another drive bay. So > recently the idea occurred to me to go the other way. If I were to get 2 > USB Flash Thunb drives say 16 or 32 GB each, not only would i be able to > mirror the root pool, but I'd also be able to put a 6th 300GB drive into > the data pool. > > That led me to wonder whether partitioning out 8 or 12 GB on a 32GB > thumb drive would be beneficial as an slog?? I bet the USB bus won't be > as good as SATA or SAS, but will it be better than the internal ZIL on > the U320 drives? > > This seems like at least a "win-win", and possibly a "win-win-win". > Is there some other reason I'm insane to consider this? > > -Kyle > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
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