On 01/20/10 10:32 AM, Thomas Burgess wrote: > > > On Wed, Jan 20, 2010 at 10:16 AM, Dave Miner <dminer at opensolaris.org > <mailto:dminer at opensolaris.org>> wrote: > > On 01/20/10 07:46 AM, Thomas Burgess wrote: > > I have OpenSolaris installed, and all is well....the one thing i > need > to figure out which i cant' find any real answers on is this: > > I installed OpenSolaris to a 20 gb partition on a SSD. > > I was able to get it mirrored by following some postings i found on > the net but i still have the other 40ish gb's left on both SSD's > which i'd like to use as L2ARC > > how do i do this? > > > Your question is better asked over on zfs-discuss, but I'll just > ask: Why would you want to? As I understand it, the L2ARC is meant > to improve random read performance by using lower-latency SSD's in > combination with hard drives as the stable storage. But you're > already using an SSD (the same on, in fact) as the stable, so you're > not going to get any latency benefits from it. > > Dave > > > My pool is made of hard drives. I used ssd's for my rpool, my storage > pool are normal hard drives, even with the rpool on a slice of the SSD, > the ssd will STILL have lower latency than my hard drive pool. At least > it SHOULD > > i was under the impression that these SSD's wouldn't be good for ZIL but > was told in ZFS discuss that they should be ok for l2arc. >
OK, thanks for clarifying that. Didn't make any sense to start with ;-) > I'm pretty sure i asked about partitions on ZFS discuss and was told > that it was the wrong place to ask. > > perhaps i'm confusing it with another question i asked....being this is > my first migration into opensolaris for server use, i've asked a few. Reviewing the rest of the earlier message, I see you've created a second Solaris2 partition. I'm not sure whether that will work properly for a L2ARC device (hence my suggestion of zfs-discuss), but theoretically you'd just refer to c2t0d0p2 as the L2ARC device when you add it to the pool (assuming it was on the first SSD and not the second, which is t1 in the output you sent). Dave
