Date: Sun, 9 Jan 2011 08:48:20 +0000 From: Josef Karthauser <joe@tao.org.uk> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>, Artem Belevich <fbsdlist@src.cx>, "Matthew D. Fuller" <fullermd@over-yonder.net>, Daniel Kalchev <daniel@digsys.bg> Subject: Re: ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks Message-ID: <96D05C71-2B1F-4813-B8FD-1DA39E384FC6@tao.org.uk> In-Reply-To: <20110108095005.GA4044@icarus.home.lan> References: <BEBC15BA440AB24484C067A3A9D38D7E0149F32D13E3@server7.acsi.ca> <488AE93A-97B9-4F01-AD0A-0098E4B329C3@my.gd> <AANLkTimezasVY%2BMJjWn2T9sBGQV-JrNmYqRwv_gPYPJP@mail.gmail.com> <CC37553B-EE13-4B5B-AC87-80D0ECC1A2B3@my.gd> <BEBC15BA440AB24484C067A3A9D38D7E0149F32D33F9@server7.acsi.ca> <4D25BF91.7070304@my.gd> <4D25C760.4070703@digsys.bg> <20110107111635.GL28453@over-yonder.net> <AANLkTikruuP5h7HuEkPSR6QRMFjtCT0YQoHsDRsvBpty@mail.gmail.com> <2E0FDC35-B6E3-49C7-A55B-B1B08FFBF1DB@tao.org.uk> <20110108095005.GA4044@icarus.home.lan>
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Brill! Thanks :) Joe On 8 Jan 2011, at 09:50, Jeremy Chadwick <freebsd@jdc.parodius.com> wrote: > On Sat, Jan 08, 2011 at 09:14:19AM +0000, Josef Karthauser wrote: >> On 7 Jan 2011, at 17:30, Artem Belevich <fbsdlist@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. >>=20 >> Can someone point me to a reference describing the various zfs caches ava= ilable? What's the arc and zil? Ive been running some zfs for a few years no= w, and must have missed thus entire subject :/. >=20 > 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-ca= che-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 >=20 > Enjoy. >=20 > --=20 > | Jeremy Chadwick jdc@parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP 4BD6C0CB | >=20 >=20
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