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From: kjansen387 <kjansen387@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: btrfs raid1 balance slow
Date: Mon, 20 Jan 2020 23:08:40 +0100	[thread overview]
Message-ID: <6bc329d9-6dc5-a4bc-e7c4-eccd377823eb@gmail.com> (raw)

Hello,

I had a btrfs raid1 with 2 4TB SATA 5400RPM disks . Regular disk I/O is 
about 2MB/sec per drive, ~40IOPS, mostly write. I had ~150GB free and 
added one 2 TB disk and started the balance:

btrfs device add -f /dev/sdb /export
btrfs filesystem balance /export

It's now running for 24 hours, 70% remaining:

# btrfs balance status -v /export
Balance on '/export' is running
1057 out of about 3561 chunks balanced (1058 considered),  70% left
Dumping filters: flags 0x7, state 0x1, force is off
   DATA (flags 0x0): balancing
   METADATA (flags 0x0): balancing
   SYSTEM (flags 0x0): balancing

I have searched for similar cases, but, I do not have quotas enabled, I 
do not have compression enabled, and my CPU supports sse4_2 . CPU 
(i7-8700K) is doing fine, 80% idle (average over all threads).

Is this normal ? I have to repeat this process 2 times (adding more 2TB 
disks), any way I can make it faster ?

Thanks!
Klaas


             reply	other threads:[~2020-01-20 22:08 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-20 22:08 kjansen387 [this message]
2020-01-20 22:13 ` btrfs raid1 balance slow Hugo Mills
2020-01-20 23:59 ` Qu Wenruo
2020-01-21  9:51 ` kjansen387
2020-01-22  8:18   ` kjansen387

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