Double-disk failure on 6 disk, raid-5 array. One disk failed on the hardware ... drive and all data is good on it and the remaining 4 disks, I'm not sure how to UNFAIL the array.

BR><BR>Current plan is for RAID 5 under CentOS 5.<BR><BR>How much of a performance improvement will a 4 disk RAID 5 be over a 3 disk one?

However, many other large capacity drives aren't at the higher spec. If you use a low-spec drive in a RAID, there's a good chance the rebuild won't work. I have a couple of 4 drive RAID 5 arrays.

Factor in the rising failure rate with age and over 4 years you are almost certain to see a disk failure during the life of those disks. But you're protected by RAID 5, right? Not in 2009.

RAID 10, or 1+0, requires 4 disks to both mirror and stripe data so that you get both speed and security. RAID 5 also combines mirroring and striping, but does it in a way that lets you use fewer ...

RAID 5 explained: RAID 5 sees the distribution of ... 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 ...

With 4 TB disks, the FlashDisk RAID disk arrays are ideal for "big data ... 3U shelves to 448 TB FlashDisk FX-2300 Series 5 GB/sec, 2U shelves to 432 TB FlashDisk FX-3400 Series 5 GB/sec, 3U ...

Reads in a RAID 5 system are very fast, but writes can be slow because of the need to write redundantly. RAID 10: you need at least 4 disks. This is a mirrored RAID 0 system in which one striped ...