If you're using a RAID level with parity, like RAID 4, 5, or 6, you're introducing more writes to your array. In the context of RAID, parity means that the array can be rebuilt if a drive fails.

Since the dawn of computing, long-term mass storage has been a primary factor in the design of systems. At issue is speed, density of storage, and of course, fault recovery.

Broadly speaking, however, when an all-flash array is a legacy product that’s been retrofitted with flash capacity then you find Raid levels that span the possible combinations of mirroring ...

The second stripe would contain data on disks 1, 2, 3 and 5 with parity information on disk 4, and so on. In our example of a 10 MB file size, we would get an almost identical amount of data on ...

I had a couple dev boxes, app server and db, and with raid5 more than 3 users and it slowed down. This was on a 5 spindle array. I rebuilt it as mirror pairs (using the hot spare in the 3rd pair ...