Hi, after a bit of advice.
I'm getting very slow transfer speeds when writing to disks attached to my RAID card.
Whilst I might get the odd burst of 150MB/s+, I average at 5-10 - and am trying to understand;
1 - Whether this is expected behavior
2 - Whether this is down to the RAID controller
3 - What I can do to improve it
Hardware:
Tyan S7012 board with x2 Xeon L5520, 24GB DDR3 Ram
Adaptec 51245 SAS controller connected to 12 SATA drives via 3x Mini-SAS-->4xSATA
Multiple WD 4TB Green disks, all empty, formatted as xfs, setup in JBOD within the controller
OS:
unRaid 6.3.3, with 1 parity disk
Couple of dockers running, but nothing intensive, no VMs, no Cache disks etc
The Tests:
I created a series of 1GB dummy files in the root of one of the drives, then used rsync to copy them to the root of another drive attached to the same controller. (I've also used other utilities for moving / copying, and tried copying from a drive connected to the standard sata port - the results are all consistent)
The attached file shows the results from transferring the files. I know I'm not using the fastest drives, or the latest hardware - and i know there'll be some overhead from writing to the parity disk (but get the same issue when writing to the disk on the sata port which does not fall under the parity disk anyway) - but surely these can't be the right speeds?
The drives themselves seem to operate fine when I use them in my Ubuntu microserver - so I'm leaning to the raid card being the culprit here. Is there anything else obvious i should rule out?
What would be best course of action be? Replace the raid card? Is there an alternative model I should consider? (On a bit of a budget!). I've only had the kit a couple of weeks - is it worth dropping the vendor a note, seeing if they have a replacement?
I don't need break-neck speeds, but need better than 5-10MB/s
I'm getting very slow transfer speeds when writing to disks attached to my RAID card.
Whilst I might get the odd burst of 150MB/s+, I average at 5-10 - and am trying to understand;
1 - Whether this is expected behavior
2 - Whether this is down to the RAID controller
3 - What I can do to improve it
Hardware:
Tyan S7012 board with x2 Xeon L5520, 24GB DDR3 Ram
Adaptec 51245 SAS controller connected to 12 SATA drives via 3x Mini-SAS-->4xSATA
Multiple WD 4TB Green disks, all empty, formatted as xfs, setup in JBOD within the controller
OS:
unRaid 6.3.3, with 1 parity disk
Couple of dockers running, but nothing intensive, no VMs, no Cache disks etc
The Tests:
I created a series of 1GB dummy files in the root of one of the drives, then used rsync to copy them to the root of another drive attached to the same controller. (I've also used other utilities for moving / copying, and tried copying from a drive connected to the standard sata port - the results are all consistent)
The attached file shows the results from transferring the files. I know I'm not using the fastest drives, or the latest hardware - and i know there'll be some overhead from writing to the parity disk (but get the same issue when writing to the disk on the sata port which does not fall under the parity disk anyway) - but surely these can't be the right speeds?
The drives themselves seem to operate fine when I use them in my Ubuntu microserver - so I'm leaning to the raid card being the culprit here. Is there anything else obvious i should rule out?
What would be best course of action be? Replace the raid card? Is there an alternative model I should consider? (On a bit of a budget!). I've only had the kit a couple of weeks - is it worth dropping the vendor a note, seeing if they have a replacement?
I don't need break-neck speeds, but need better than 5-10MB/s
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