ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks

Jeremy Chadwick freebsd at jdc.parodius.com
Sat Jan 8 09:55:07 UTC 2011


On Sat, Jan 08, 2011 at 09:14:19AM +0000, Josef Karthauser wrote:
> On 7 Jan 2011, at 17:30, Artem Belevich <fbsdlist at src.cx> wrote:
> > One way to get specific ratio for *your* pool would be to collect
> > record size statistics from your pool using "zdb -L -b <pool>" and
> > then calculate L2ARC:ARC ratio based on average record size. I'm not
> > sure, though whether L2ARC stores records in compressed or
> > uncompressed form.
> 
> Can someone point me to a reference describing the various zfs caches available? What's the arc and zil? Ive been running some zfs for a few years now, and must have missed thus entire subject :/.

ARC:   http://en.wikipedia.org/wiki/ZFS#Cache_management
L2ARC: http://en.wikipedia.org/wiki/ZFS#Storage_pools
L2ARC: http://blogs.sun.com/brendan/entry/test
Both:  http://www.c0t0d0s0.org/archives/5329-Some-insight-into-the-read-cache-of-ZFS-or-The-ARC.html
Both:  http://nilesh-joshi.blogspot.com/2010/07/zfs-revisited.html
ZIL:   http://blogs.sun.com/perrin/entry/the_lumberjack
ZIL:   http://blogs.sun.com/realneel/entry/the_zfs_intent_log

Enjoy.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |



More information about the freebsd-stable mailing list