> > > ZFS is always consistent on-disk, by design. Loss of the ZIL will result > in loss of the data in the ZIL which hasn't been flushed out to the hard > drives, but otherwise, the data on the hard drives is consistent and > uncorrupted. > > > > This is what i thought. I have read this list on and off for awhile now but i'm not a guru....I see a lot of stuff about the intel ssd and disabling the write cache....so i just wasn't sure...This is good news.
> > It avoids the scenario of losing data in your ZIL due to power loss (and, > of course, the rest of your system). So, yes, if you actually care about > your system, I'd recommend at least a minimal UPS to allow for quick > shutdown after a power loss. > > > yes, i have a nice little UPS. I've tested it a few times and it seems to work well. It gives me about 20 minutes of power and can even send commands via a script to shut down the system before the battery goes dry. > That's going to pretty much be the best-case use for the ZIL - NFS writes > being synchronous. Of course, using the rest of the SSD for L2ARC is likely > to be almost (if not more) helpful for performance for a wider variety of > actions. > > > yes, i have another machine without a zil (i bought a kingston 64 gb ssd on sale and intended to try it as a zil but ultimately decided to just use it as l2arc because of the performance numbers...) but the l2arc helps a ton for my uses. I did slice this ssd...i used 9 gb for zil and the rest for l2arc (about 36 gb) I'm really impressed with this ssd....for only 160 dollars (180 - 20 mail in rebate) it's a killer deal. it can do 235 MB/s sustained writes and has soemthing like 15,000 iops > -- > Erik Trimble > Java System Support > Mailstop: usca22-123 > Phone: x17195 > Santa Clara, CA > >
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