Hello Everyone
Specs for the machine listed below. I am seeing some weird mirrored vdev behavior and don't understand. I have (8) 6TB HGST NAS Drives that R/W at about 210MB/s. I set them all up in a 2x4 mirror vdev pool expecting about 800MB/sread write and 1600MB/s write read, but I only was getting 800MB/s write and 700MB/s read. The same machine is running 4TB HGST NAS drives in a 2x14 mirror vdev pool and I was able to get about 1400MB/s write and 2500MB/s read. So down the troubleshooting stage I went.
First I ran solnet array test on the 6TB drives. It reported about 200 +/- MB/s performance for all drives. I then decided to build 4 single vdev pools, and test them individually. Using dd from /dev/zero with compression off, I would get equal read and write performance, just over 220MB/s.
Why am I not getting normal double drive mirror read performance.
Specs
FreeNAS-11.2-U3
Chenbro NR 40700
SuperMicro X8
96GB ECC RAM
Chelsea T-420BT
LSI 9210i
LSI 9707e
Internal Drives (All One Pool)
36 8TB Drives in 5 RAIDz2 vdevs
6 3TB drives in RAIDz2
Expansion Chasis
Supermicro CSE847 45 Drive JBOD
All 24 Front Drives loaded with 4TB HDST NAS DRIVES
4 Additional 4TB HGST Drives on Rear Backplane
2 1TB Sandisk SSD's on Rear Backplane
8 6tb HGST NAS on rear backplane
I am sure I am doing something wrong, but how can I see true mirrored vdev performance?
Specs for the machine listed below. I am seeing some weird mirrored vdev behavior and don't understand. I have (8) 6TB HGST NAS Drives that R/W at about 210MB/s. I set them all up in a 2x4 mirror vdev pool expecting about 800MB/s
First I ran solnet array test on the 6TB drives. It reported about 200 +/- MB/s performance for all drives. I then decided to build 4 single vdev pools, and test them individually. Using dd from /dev/zero with compression off, I would get equal read and write performance, just over 220MB/s.
Why am I not getting normal double drive mirror read performance.
Specs
FreeNAS-11.2-U3
Chenbro NR 40700
SuperMicro X8
96GB ECC RAM
Chelsea T-420BT
LSI 9210i
LSI 9707e
Internal Drives (All One Pool)
36 8TB Drives in 5 RAIDz2 vdevs
6 3TB drives in RAIDz2
Expansion Chasis
Supermicro CSE847 45 Drive JBOD
All 24 Front Drives loaded with 4TB HDST NAS DRIVES
4 Additional 4TB HGST Drives on Rear Backplane
2 1TB Sandisk SSD's on Rear Backplane
8 6tb HGST NAS on rear backplane
I am sure I am doing something wrong, but how can I see true mirrored vdev performance?
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