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Abysmal performance of 2 vdev mirror * 7 vs 2 vdev mirror

Western Digital Drives - The Preferred Drives of FreeNAS and TrueNAS CORE

nwm

Cadet
Joined
May 4, 2020
Messages
1
We were having performance issues initially on a S45 and decided to replace all drives (iirc had 8 drives initially) our 2 drive mirror pool gets ~700MB/s and our 14 drive mirror gets ~650MB/s. All drives are identical type

2 drive 1 vdev mirror pool with identical drives:
Code:
root@storage-03:/mnt/syslog # dd if=/dev/zero of=test bs=8k count=256000256000+0 records in
256000+0 records in
256000+0 records out
2097152000 bytes transferred in 3.119743 secs (672219545 bytes/sec)


14 drive 7 vdev mirror pool with same identical drives as above:
Code:
root@storage-03:/mnt/pool # dd if=/dev/zero of=test bs=8k count=256000
256000+0 records in
256000+0 records out
2097152000 bytes transferred in 3.210907 secs (653133830 bytes/sec)
 
Joined
Oct 18, 2018
Messages
969
Can you tell us a bit more about your setup? What kind of drives exactly are they? How full are your pools? What version of FreeNAS? How full are the pools? What kind of network connection are you using in typical use cases?
 
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