On 02/08/2014 07:17 PM, Markus Falb wrote:
On 08.Feb.2014, at 11:25, Mogens Kjaer wrote:
On 02/07/2014 11:47 PM, Matt wrote:
Having a single drive is slowing down reads as well, I think.
This depends upon how the RAID is set up.
No, mdraid 1 is mdraid 1.
A standard Linux RAID1 setup does not give better reading performance when reading large files than a single disk.
I don't know if the RAID system is cleaver enough to save some seek time.
Process X is utilizing only one single disk, so no performance gain. But if you have 2 processes in parallel, then you potentially have a gain, because the process Y can read from another disk.
process X -> disk 0 process Y -> disk 1
In order to get better read performance you'll have to set it up as RAID10 with far copies.
Yes, mdraid 10 could be a solution for the "1 process should utilize more than one disk" goal. I haven't tried it though, what a shame.
Why is that far copies thing important?
Better read from "the horses mouths": https://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10