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Hey guys, I have a NAS that I've built that is running freenas, and I'd like it to be capable of supporting 15 physical drives. I'm currently using the supermicro CSE-M35T-1B drive bays, and really like them. Problem is my transfer rates on each disk go from about 120-160MB/s to <30MB/s when installed in the bays. I've heard reports of others having this problem, but only a couple times. I have 3 of these, and they all test the same.
So unless anyone has some advice on how to make these work, I'd like any suggestions for fitting 15 drives in a 9 external 5.25 bay enclosure. Hot swappable isn't required, but would be preferred. Just much easier from a maintenance perspective.
So I called supermicro tech support last night and explained the problem I'm having with their drive bays.
In a nutshell, I'm running the following command:
Code:
dd if=/dev/zero of=testfile bs=2048k count=2k
This is run from the datastore that I'm testing, and with the drives connected directly to the mobo SATA controller, I get numbers real close to this each time:
Code:
/mnt/Test0# dd if=/dev/zero of=testfile bs=2048k count=2k
2048+0 records in
2048+0 records out
4294967296 bytes transferred in 30.675493 secs (140012984 bytes/sec)
When I connect the drives with the same cables, etc, using the SATA backplane, I get the following numbers:
Code:
/mnt/Test0# dd if=/dev/zero of=testfile bs=2048k count=2k
2048+0 records in
2048+0 records out
4294967296 bytes transferred in 250.289863 secs (17159973 bytes/sec)
The email I received from Supermicro support last night:
Quote:
Hi
Heres what I use to test the hard drive performance.
Motherboard: Supermicro H8QGi-F, south bridge is SP5100
HDD: two WD RE4 500GB, both connect from on-board SATA ports to CSE-M35T-1
OS: windows 2008 R2
I copied a 3GB ISO file from one WD to another within less than 4 seconds.
My hardware on this server is as follows:
MSI 870A-G54 Motherboard
AMD Athlon(tm) II X2 4400e Processor
4GB RAM
WD 20 EARS Disks
I'm running FreeNAS-8.2.0-RELEASE-p1-x64 (r11950) using one disk ZFS volumes for testing this.
Am I missing something, or is there clearly a problem with the backplanes?
So unless anyone has some advice on how to make these work, I'd like any suggestions for fitting 15 drives in a 9 external 5.25 bay enclosure. Hot swappable isn't required, but would be preferred. Just much easier from a maintenance perspective.
So I called supermicro tech support last night and explained the problem I'm having with their drive bays.
In a nutshell, I'm running the following command:
Code:
dd if=/dev/zero of=testfile bs=2048k count=2k
This is run from the datastore that I'm testing, and with the drives connected directly to the mobo SATA controller, I get numbers real close to this each time:
Code:
/mnt/Test0# dd if=/dev/zero of=testfile bs=2048k count=2k
2048+0 records in
2048+0 records out
4294967296 bytes transferred in 30.675493 secs (140012984 bytes/sec)
When I connect the drives with the same cables, etc, using the SATA backplane, I get the following numbers:
Code:
/mnt/Test0# dd if=/dev/zero of=testfile bs=2048k count=2k
2048+0 records in
2048+0 records out
4294967296 bytes transferred in 250.289863 secs (17159973 bytes/sec)
The email I received from Supermicro support last night:
Quote:
Hi
Heres what I use to test the hard drive performance.
Motherboard: Supermicro H8QGi-F, south bridge is SP5100
HDD: two WD RE4 500GB, both connect from on-board SATA ports to CSE-M35T-1
OS: windows 2008 R2
I copied a 3GB ISO file from one WD to another within less than 4 seconds.
My hardware on this server is as follows:
MSI 870A-G54 Motherboard
AMD Athlon(tm) II X2 4400e Processor
4GB RAM
WD 20 EARS Disks
I'm running FreeNAS-8.2.0-RELEASE-p1-x64 (r11950) using one disk ZFS volumes for testing this.
Am I missing something, or is there clearly a problem with the backplanes?