When should I use a RAID 4 or RAID 5 volume?
Both RAID 4 and RAID 5 volumes give you very high performance while still protecting your volume from disk failure. They are a great choice if you need high performance for writing large files or for reading files of any size, ie for video editing, animation studios, digital photography, prepress and graphic arts. With RAID 4 and RAID 5, the volume will keep working even after a disk gets an error or fails completely.
If you are using SSDs, RAID 4 is preferable to RAID 5; with SSDs, RAID 4 reads are up to 20% quicker, so it’s great for things like large video files which need to be read fast.
RAID 4 and RAID 5 are good for reading small files which are frequently read. They are not a good choice if you need to write a lot of small files as fast as possible. If you need to write many small files, we suggest you use RAID 1+0.