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From: Jorge Bastos <jorge.mrbastos@gmail.com>
To: Robert Krig <robert.krig@render-wahnsinn.de>
Cc: Chris Murphy <lists@colorremedies.com>,
	Linux Btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: How long should a btrfs scrub with RAID5/6 take?
Date: Thu, 9 Jan 2020 08:57:16 +0000	[thread overview]
Message-ID: <CAHzMYBSrZdjwJcMj86u8Dr_imxyiRN5yE=cFgNC9Tofb42umXw@mail.gmail.com> (raw)
In-Reply-To: <0530e18f43a5f31ff8d446be362951f68068b5db.camel@render-wahnsinn.de>

I reported recently to the list there there's a performance problem
with scrubs on raid5/6 pools, initial report and followups here:

https://lore.kernel.org/linux-btrfs/CAHzMYBTXvY1VgcoFDUvc2NFmVKq2HJRHuS0VXzoneUMh79cySA@mail.gmail.com/

Quick recap:

4 disk raid5 (raid1 metadata)

UUID:             b75ee8b5-ae1c-4395-aa39-bebf10993057
Scrub started:    Wed Nov 27 07:32:46 2019
Status:           running
Duration:         7:34:50
Time left:        1:52:37
ETA:              Wed Nov 27 17:00:18 2019
Total to scrub:   1.20TiB
Bytes scrubbed:   982.05GiB
Rate:             36.85MiB/s
Error summary:    no errors found

11 disk raid5 (raid1 metadata)

UUID:             1236acc8-dbd5-41bd-bf3d-872a8fbbce49
Scrub started:    Sun Dec 15 11:23:45 2019
Status:           running
Duration:         0:51:34
Time left:        90:06:52
ETA:              Thu Dec 19 06:22:13 2019
Total to scrub:   18.10TiB
Bytes scrubbed:   175.12GiB
Rate:             57.96MiB/s
Error summary:    no errors found

Same 11 disk pool during a btrfs send to /dev/null confirming it's
capable of much better read speeds:

btrfs send /mnt/disks/Pics/T12_disk1_Pics_2019-12-15-0829/ | pv -bart
> /dev/null
At subvol /mnt/disks/Pics/T12_disk1_Pics_2019-12-15-0829/
 447GiB 0:13:19 [ 635MiB/s] [ 573MiB/s]

Current speed 635MiB/s, average speed so far 573MiB/s

  reply	other threads:[~2020-01-09  8:57 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-08 10:13 How long should a btrfs scrub with RAID5/6 take? Robert Krig
2020-01-08 17:07 ` Joshua
2020-01-08 21:49 ` Chris Murphy
2020-01-09  6:38   ` Robert Krig
2020-01-09  8:57     ` Jorge Bastos [this message]
2020-01-09 22:48     ` Chris Murphy

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