From: Russell Coker <russell@coker.com.au>
To: linux-btrfs@vger.kernel.org
Subject: ditto blocks on ZFS
Date: Fri, 16 May 2014 13:07:05 +1000 [thread overview]
Message-ID: <2308735.51F3c4eZQ7@xev> (raw)
https://blogs.oracle.com/bill/entry/ditto_blocks_the_amazing_tape
Probably most of you already know about this, but for those of you who haven't
the above describes ZFS "ditto blocks" which is a good feature we need on
BTRFS. The briefest summary is that on top of the RAID redundancy there is
one more copy of metadata than there is of data, so copies=2 implies 3 copies
of metadata and the default option of 1 copy of data means that metadata is
"dup" in addition to whatever RAID redundancy is in place.
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
next reply other threads:[~2014-05-16 3:07 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-16 3:07 Russell Coker [this message]
2014-05-17 12:50 ` ditto blocks on ZFS Martin
2014-05-17 14:24 ` Hugo Mills
2014-05-18 16:09 ` Russell Coker
2014-05-19 20:36 ` Martin
2014-05-19 21:47 ` Brendan Hide
2014-05-20 2:07 ` Russell Coker
2014-05-20 14:07 ` Austin S Hemmelgarn
2014-05-20 20:11 ` Brendan Hide
2014-05-20 14:56 ` ashford
2014-05-21 2:51 ` Russell Coker
2014-05-21 23:05 ` Martin
2014-05-22 11:10 ` Austin S Hemmelgarn
2014-05-22 22:09 ` ashford
2014-05-23 3:54 ` Russell Coker
2014-05-23 8:03 ` Duncan
2014-05-21 23:29 ` Konstantinos Skarlatos
2014-05-22 15:28 Tomasz Chmielewski
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