Seagate 7200.11 in RAID 0/5 - SLOW performance!!

[The Real Zardoz]

Hi,

Just got a RAID going with some 7200.11 drives on my RAIDcore. Both ATTO and HD tach reflect the same issues and would explain why an array expansion from 3 to 4 drives is going to take 91 hours...:



Using a small data/block size in ATTO yields a 500MB(!)/sec read however as soon as it hits the disk, I see around 50MB/sec maximum.

What's going on!?! Have Seagate burned me again, the one time I finally get over the same problem I had with the Barracuda IV?

 

[Dangman]

Maybe it's the controller? What exact controller do you have?

 

[The Real Zardoz]

Hi,

I'm using a Broadcom RAIDcore BC4852. This controller can do 200MB/sec+ and has done so on the older array which was originally made up of 6x250GB Maxtor MaxLine IIs (until four of them failed, got replaced, then failed again and were replaced with a mix of Seagate 7200.9 and .10 drives and still performed around the same).

 

[Madwand]

Have you tried a disk rescan?

Are all the disks OK?

Is this on a PCI bus?

 

[fibroptikl]

What firmware level is on the drive?