RabidSmurf
n00b
- Joined
- Jun 30, 2009
- Messages
- 56
Ok so if you read my other thread you'll know I've been having trouble getting a RAID card to work with an onboard video, suffice to say I finally got it working with a new board.
Now my problem is absolutely atrocious write performance, like we're talking barely 100Mb/s (Yes megabits not bytes). This is drive to drive, not over the network.
The setup:
Zotac IONITX L-E Atom 330 Board
4GB DDR3 RAM
LSI Perc 5/i RAID Controller w/ 256MB RAM
Windows 7 Ultimate installed on a single 7200RPM 74GB HDD
4x 1.5 TB Western Digital "Green" drives in RAID 5 (2 are 32mb caching and 2 are 64mb caching).
RAID Config:
RAID Level: 5
Stipe Size: 128k
Disk Cache Policy: Enable
Current Write Policy: Write Through (I can't use Write Back yet since my battery backup isn't here yet, could this be the problem?).
Read Policy: Adaptive Read Ahead
IO Policy: Direct IO
Access Policy: Read Write
Now, I am aware that green drives aren't best for RAID, I went with them because they're cheap, I also know someone else who has a virtually identical setup and can manage around 80MB/s while writing to the RAID 5. I am getting about 15. So I am pretty sure it's not the drives...
I have a single 1.5TB with all my stuff on it that I am trying to transfer onto the RAID, I've tested writing from it to other single drives and get around 70MB/s which acceptable, to the RAID i get 15.
I know RAID 5 has parity calculations and won't be as good as something like RAID 0 but there is no way it can be this bad even with those green drives. I must've done something wrong.
Is it simply the fact that I am using Write Through right now, or do you guys have any other suggestions for improving this?
EDIT: What about PCI-E Settings in the BIOS?
Thanks in advance,
Kevin
Now my problem is absolutely atrocious write performance, like we're talking barely 100Mb/s (Yes megabits not bytes). This is drive to drive, not over the network.
The setup:
Zotac IONITX L-E Atom 330 Board
4GB DDR3 RAM
LSI Perc 5/i RAID Controller w/ 256MB RAM
Windows 7 Ultimate installed on a single 7200RPM 74GB HDD
4x 1.5 TB Western Digital "Green" drives in RAID 5 (2 are 32mb caching and 2 are 64mb caching).
RAID Config:
RAID Level: 5
Stipe Size: 128k
Disk Cache Policy: Enable
Current Write Policy: Write Through (I can't use Write Back yet since my battery backup isn't here yet, could this be the problem?).
Read Policy: Adaptive Read Ahead
IO Policy: Direct IO
Access Policy: Read Write
Now, I am aware that green drives aren't best for RAID, I went with them because they're cheap, I also know someone else who has a virtually identical setup and can manage around 80MB/s while writing to the RAID 5. I am getting about 15. So I am pretty sure it's not the drives...
I have a single 1.5TB with all my stuff on it that I am trying to transfer onto the RAID, I've tested writing from it to other single drives and get around 70MB/s which acceptable, to the RAID i get 15.
I know RAID 5 has parity calculations and won't be as good as something like RAID 0 but there is no way it can be this bad even with those green drives. I must've done something wrong.
Is it simply the fact that I am using Write Through right now, or do you guys have any other suggestions for improving this?
EDIT: What about PCI-E Settings in the BIOS?
Thanks in advance,
Kevin
Last edited: