On Sun, 2 Jan 2000, Thomas Waldmann wrote:
[...]
> RAID5, WRITE: you will have better write performance than with single disk. The
> more disks you use, the better performance you will have. But: you will
> have quite some CPU load, so a fast CPU is good for performance (and if your
> apps also do a high cpu load, better go for a SMP system).
Conventional wisdom is that the parity calculation (actually, re-reading
non-new stripes to generate parity) gets increasingly expensive with more
disks in a rank.
Seven disks used to be considered the largest practical number for a RAID 5
rank because of this...
-Andy
