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Re: IDEA: Shortening boot-time



On July 24, 2004 05:03 am, Russell Coker <russell coker com au> wrote:
> Last time I did some tests on Linux software RAID I found that it was
> lacking in this regard.  I would have hoped to see some read benchmarks
> showing that a RAID-1 with two disks is nearly twice as fast as a single
> disk, however I didn't find any test that showed such a result or anything
> close to it. Optimising the read performance of Linux software RAID is one
> thing that can be done to improve such things (and generally improve all
> Linux performance).

You actually expect to get twice the performance out of a RAID 1 array in 
software RAID? First of all writes are not going to be any faster than a 
single drive and could be slower depending on your hardware. Reads could be 
faster depending on you hardware but twice? Only very highend (expensive) 
SCSI raid cards do that and only theoretically. Practically you won't get 
twice the performance.

regards,
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