I have an ASRock X79 Extreme 11 motherboard which has an onboard LSI 2308 RAID controller. Into this I have plugged 4 x 512GB Samsung 840 SSD drives and created a RAID 10 array, giving me a 929GB volume.
The array is created at boot time, and onto it I have installed Windows 7 x64. I did some testing today and found that the write speed seems ridiculously slow.
I'm getting a sequential read speed of ~900MB/s, but my write speed is ~30MB/s. Yes, I didn't forget a zero!
I have checked all the settings of the drive and they are as LSI recommend, i.e.
Stripe Size: 64KB (actually they recommend 256KB but I don't think I had the option to change this)
Access Policy: Read Write
Disk Cache Policy: Disable
Read Policy: No Read Ahead
IO Policy: Direct IO
Write Policy: Write Through
If I enable Disk Cache Policy then I get a write speed of almost 300MB/s. However, there's a big warning that any power loss or crash could destroy the whole volume, and I have no UPS.
I have tried updating the Windows driver (from 2.0.57 to 2.0.63), and have updated the RAID controller firmware (from 13.00.57 to 16.00.00), but neither have brought any improvements.
Can anyone suggest what the problem could be, and if there is anything I can do to improve this?
Thanks,
Campbell
The array is created at boot time, and onto it I have installed Windows 7 x64. I did some testing today and found that the write speed seems ridiculously slow.
I'm getting a sequential read speed of ~900MB/s, but my write speed is ~30MB/s. Yes, I didn't forget a zero!
I have checked all the settings of the drive and they are as LSI recommend, i.e.
Stripe Size: 64KB (actually they recommend 256KB but I don't think I had the option to change this)
Access Policy: Read Write
Disk Cache Policy: Disable
Read Policy: No Read Ahead
IO Policy: Direct IO
Write Policy: Write Through
If I enable Disk Cache Policy then I get a write speed of almost 300MB/s. However, there's a big warning that any power loss or crash could destroy the whole volume, and I have no UPS.
I have tried updating the Windows driver (from 2.0.57 to 2.0.63), and have updated the RAID controller firmware (from 13.00.57 to 16.00.00), but neither have brought any improvements.
Can anyone suggest what the problem could be, and if there is anything I can do to improve this?
Thanks,
Campbell