Re: btrfs raid1 balance slow

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Forgot to mention; I'm running kernel 5.4.10-200.fc31.x86_64 .

Op 20-Jan-20 om 23:08 schreef kjansen387:
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




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