From: Rich Freeman <rich0@gentoo.org>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Hard drive storage questions
Date: Tue, 28 Apr 2015 13:38:55 -0400 [thread overview]
Message-ID: <CAGfcS_nCKvCoquH=+T=_c3YDAnhBk2L9=6b9=GrikuWy2MC7Sw@mail.gmail.com> (raw)
In-Reply-To: <20150428162448.160e1683@digimed.co.uk>
On Tue, Apr 28, 2015 at 11:24 AM, Neil Bothwick <neil@digimed.co.uk> wrote:
> The same is also possible with BTRFS, including built in RAID. RAID5 in
> btrfs is expermiental, but its RAID1 is like RAID5 in some ways, such as
> giving the capacity of n-1 disks and tolerating a single disk failure.
>
btrfs raid5 is still fairly experimental (though now it supports
recovery) and works more-or-less how you'd expect raid5 to work.
Raid1 on btrfs gives you the capacity of n/2 and not n-1 disks, as you
would expect. It does allow disks to be of different size, in which
case it gives you up to n/2 capacity (and usually more than you'd get
with traditional raid1 - it tries to fill the largest disks first so
3+1+1+1 TB will give you 3TB of storage, not 2TB as you'd get with
mdadm raid1).
Here is a btrfs raid1:
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sdh2 3.2T 2.7T 477G 86% /data
btrfs fi df /data
Data, RAID1: total=2.93TiB, used=2.65TiB
System, RAID1: total=32.00MiB, used=472.00KiB
Metadata, RAID1: total=16.00GiB, used=14.08GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
btrfs fi sho /data
Label: 'datafs' uuid: cd074207-9bc3-402d-bee8-6a8c77d56959
Total devices 5 FS bytes used 2.67TiB
devid 1 size 2.73TiB used 2.63TiB path /dev/sdh2
devid 2 size 931.32GiB used 832.03GiB path /dev/sda2
devid 3 size 931.32GiB used 834.00GiB path /dev/sde2
devid 4 size 931.32GiB used 832.00GiB path /dev/sdd2
devid 5 size 931.32GiB used 833.00GiB path /dev/sdb2
2.7TiB of data is stored on the array, which has nearly exhausted the
space of 6.4TiB of drives (or 7TB). There are ~500GiB free, which
would let me store ~250GiB of data.
--
Rich
next prev parent reply other threads:[~2015-04-28 17:39 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-28 8:39 [gentoo-user] Hard drive storage questions Dale
2015-04-28 14:49 ` Francisco Ares
2015-04-28 15:01 ` Alan McKinnon
2015-04-28 15:24 ` Neil Bothwick
2015-04-28 17:38 ` Rich Freeman [this message]
2015-04-28 18:11 ` Neil Bothwick
2015-04-28 18:31 ` Rich Freeman
2015-04-28 18:41 ` Neil Bothwick
2015-04-28 22:02 ` [gentoo-user] " walt
2015-04-29 1:24 ` Rich Freeman
2015-04-29 6:20 ` Alan McKinnon
2015-04-29 14:31 ` Grant Edwards
2015-04-29 6:13 ` [gentoo-user] " Alan McKinnon
2015-04-29 7:52 ` Neil Bothwick
2015-05-04 7:39 ` Dale
2015-05-04 7:46 ` Neil Bothwick
2015-05-04 8:13 ` Mick
2015-05-04 8:26 ` Dale
2015-05-04 8:23 ` Dale
2015-05-04 10:31 ` Neil Bothwick
2015-05-04 10:40 ` Dale
2015-05-04 11:26 ` Neil Bothwick
2015-05-09 10:56 ` Dale
2015-05-09 12:59 ` Rich Freeman
2015-05-09 14:46 ` Todd Goodman
2015-05-09 18:16 ` Rich Freeman
2015-05-04 11:35 ` Rich Freeman
2015-05-04 18:42 ` Nuno Magalhães
2015-05-05 6:41 ` Alan McKinnon
2015-05-05 10:56 ` Rich Freeman
2015-05-05 11:33 ` Neil Bothwick
2015-05-05 12:05 ` Mick
2015-05-05 12:21 ` Neil Bothwick
2015-05-05 12:39 ` Mick
2015-05-05 12:53 ` Rich Freeman
2015-05-05 21:50 ` Neil Bothwick
2015-05-05 22:21 ` Bill Kenworthy
2015-05-05 22:33 ` Bill Kenworthy
2015-05-04 10:57 ` Alan Mackenzie
2015-04-28 15:02 ` Rich Freeman
2015-05-04 7:23 ` Dale
2015-05-05 3:01 ` Walter Dnes
-- strict thread matches above, loose matches on Subject: below --
2018-11-09 1:16 Dale
2018-11-09 1:31 ` Jack
2018-11-09 1:43 ` Dale
2018-11-09 2:04 ` Andrew Lowe
2018-11-09 2:07 ` Bill Kenworthy
2018-11-09 8:39 ` Neil Bothwick
2018-11-09 2:29 ` Rich Freeman
2018-11-09 8:17 ` Bill Kenworthy
2018-11-09 13:25 ` Rich Freeman
2018-11-09 9:02 ` J. Roeleveld
2018-11-11 0:45 ` Dale
2018-11-11 21:41 ` Wol's lists
2018-11-11 22:17 ` Dale
2018-11-09 9:24 ` Wols Lists
2015-04-27 7:41 Dale
2015-04-28 18:25 ` Daniel Frey
2015-04-28 21:23 ` Dale
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