About mixed RPM in bay

[Copis_1]

I put 2 disks 10000rpm in raid1 and put 4 disks 15000rpm in raid5 into the same server (let's say ML350g4). Are all my disks going to run at 10000rpm?

greetz

[Igor Karasik]

RAID1 will work at 10K rpm and RAID5 will work at 15k rpm. (I assume you use SmartArray controller).

[Shameer.V.A]

Hi Greetz,
It is absolutely no relation with RPM of disk on a RAID array.
15 K rpm disk will work in 15K & 10K rpm disk will work in 10K eventhough both are in same array.

More rpm on a disk will reduce your seek time &write time.
Once data is given to the disk controller/buffer from RAID controller, it will hold there unless the current write/ read activity to complete. So if you have higher rpm disk, this process will complete faster than the other disk.

Hope now you can conclude...

Regards,

Shameer

[Mahesh Kumar Malik]

Hi greetz

Both sets will work at different speed, but this is not a recommended option.

Regards
Mahesh

[e4services]

Malik here is totally incorrect. Shameer.V.A is correct.
Who knows what Malik is talking about but it is not HP or the industry in general.
The RPM of the drive, as V.A. described, is absolutely unknown to and downstream of the controller. The interface (U160/U320) is the ONLY thing that will be shared between the controller and the drive.