With RAID 5 capability is lost if there are disks of different sizes? Same as RAID 0 and RAID 1. If something happens the speeds are different? 10K and 15K.
RAID 5 with different sizes and different speeds
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With RAID 5 capability is lost if there are disks of different sizes? Same as RAID 0 and RAID 1. If something happens the speeds are different? 10K and 15K.
Best Answer
Yes, in a RAID5 array the smallest physical volume (disk or partition) will define the size of the array, so any extra space on larger volumes in the array is not used.
You should not see any issues with drives of different speeds other than the fact the the slower drive(s) will reduce average performance.
If one of the drives is much much faster than the others then RAID4 is better then RAID5 as it keeps the parity on one one disk. If you select the faster drive for the parity area you essentially have RAID0 on the other two+ drives for read access, and parity on the faster drive (for every write, the parity drive much be written to too, as with the distributed parity blocks of RAID5). But I doubt that the difference between 15K and 10K drives will make much difference to overall performance either way here. RAID4 offers the same protection as RAID5 (it can survive one drive failing), though is not always offered as it is very rarely desirable in practise.