July 21, 201015 yr Hey all, I'm sure everyone is playing with unRAID 5.0beta1 and once it's out of beta I will be upgrading as I have filled up my 15 disk array here. I recently updated and removed all the old IDE drives in my system to improve read and parity performance, but it seems that my parity is MUCH slower. Systemlog is attached... Anyone see anything that could be the culprit? I am using one of the Super Micro 8 port SATA PCI cards which is filled with SATA drives. The remaining drives are plugged into the MOBO... Thank you in advance! syslog-2010-07-21.txt
July 21, 201015 yr PCI Bus is 133MB/s You have 8 drives on it, all sharing that bandwidth. Max possible speed would then be 133 / 8 = 16MB/s when reading all the disks if it had exclusive use of the PCI bus and everything was perfect. Obviously, it is sharing some bus time with the other disks on the motherboard based disk controller. Joe L.
July 21, 201015 yr As Joe L pointed out, you are achieving near the maximum possible with that setup. Even if you utilized a PCI IDE controller, you'd still be as limited. This is why I advise people to use onboard SATA and then PCI-Express SATA cards. As a possibly alternative, using PCI-X is acceptable, but plain PCI is not unless you have at most 2 drives on it.
July 22, 201015 yr Author I see! So the way to get better speed is to get a PCI-Express card... THANK YOU!!!
Archived
This topic is now archived and is closed to further replies.