Per Jessen wrote:
Lorenzo Cerini wrote:
It depends on your controller, but hardaware raid should anyway give you better performance. Beside, maybe 24 disks are pretty a lot, but which is the expectation to burst a second disk, before you change the first one?
Yes, the failure of a 2nd disk while a degraded array is being rebuilt.
And which is the expectation to burst a second disk before you can change the first one over a bunch of six?
The array will have hot spares, so when a disk fails, it will automatically pick a spare from a set and start rebuilding. I have no idea of the actual probability of a 2nd drive failing during the rebuild, but the more drives the higher the risk.
I would go with 2 raid5 hw-array.
RAID15?
/Per Jessen, Zürich
Just to keep on watching probabilities, costs, disk-space, overhead. If you raid-1 the two raid5 array you lost 7 disk space. Beside any raid thing, wuold be nice to have a daily backup. Likely it's easier that a bomb falls on your server farm and destroy everything than you lost any sensible data with 2 distinct raid5 and a backup politic. What i mean is that the gain of two raid 5 put in raid 1 (with 7 disk space loss) over 2 simple raid 5 array with 2 disk space loss, with a backup politic is not significant. L.