Zero-filled blocks in HAMMER
Tomohiro Kusumi
kusumi.tomohiro at gmail.com
Sun Aug 28 09:25:48 PDT 2016
This might be off topic as I brought this from tux3 ml archive,
but what does "FS converted zerod blocks to hole like hammerfs"
supposed to mean here ?
Is this talking about sparse file ?
(and do BSDs including DragonFly even support sparse file ?)
http://phunq.net/pipermail/tux3/2015-August/002327.html
> Also, if FS converted zerod blocks to hole like hammerfs, simply ENOSPC happens.
This is the result of
# dd if=/dev/zero of=xxx bs=16384 count=10
against a newly created fs, and there are 10 zero-filled data records,
which is what I was expecting to see in fs level from the way hammer
is implemented.
--
HAMMER zone statistics
zone # blocks items used[B] used[%]
zone 0 0 0 0 0
zone 1 0 0 0 0
zone 2 0 0 0 0
zone 3 0 0 0 0
zone 4 0 0 0 0
zone 5 0 0 0 0
zone 6 0 0 0 0
zone 7 0 0 0 0
zone 8 1 1 4096 0.0488281
zone 9 1 4 572 0.00681877
zone 10 1 10 163840 1.95312
zone 11 0 0 0 0
zone 12 0 0 0 0
zone 13 0 0 0 0
zone 14 0 0 0 0
zone 15 0 0 0 0
----------------------------------------------------------------------
total 3 15 168508 0.669591
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