SATA, Raid 1, LVM and controller question.
Robin.Laing at drdc-rddc.gc.ca
Thu Dec 15 16:31:37 UTC 2005
I have a question about peoples experience with SATA and RAID 1.
I have 4 SATA drives, 2 which are presently md0 in an initial LVM. I
am about to add the second two drives as md1 to the LVM. One
controller is onboard and the other is a PCI card.
Now with the present setup, I have the md0 drives on the same SATA
controller chip and I notice that when large files are written to the
array, there is a pause in the operation of the workstation. Anything
being done is affected.
I was wondering if moving the drives to different controllers would
benefit in throughput as putting IDE drives on different controllers?
I am thinking of doing it but I have not seen any information on
physically moving md drives from lets say sda to sdc.
As the LVM is looking at md0 and not the sd* devices, I don't think I
will have to do anything with LVM during this.
I will backup the data just to be safe.
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