RAID 5 verry slow on Starkeh S354UFER


I have a 4 bay StarTech RAID enclosure (S354UFER) with 4x2GB Smasung Spinpoint Drives. RAID 0 was very fast but RAID 5 is slower than my other UDB2 drives to write (I am using FW800 for RAID). Is this normal?

I am considering switching from RAID 5 to 10. I know it will give me less storage but it will be fast and secure (I gather I can loose 1 drive without data loss). I assume this is fast to write as well as read.

Everybody seems to be recommending RAID 5, odd they do not mention how slow to write it is;(.

All advise gratefully received.

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  1. Ben

    RAID5 is fast... It just what is the raid engine that the raid was built on...

    My eBOX-R5 with five 3.0TB Hitachi 5400rpm via Mobo internal SATA port (using eSATA bracket). I was able to transfer at 250MB/s under RAID5.

    I guess the PLX - OXUFS936QSE's IO processor does not have enough power to calculate the parity bit for the raid5.

    So it's fast if you are use/buy the correct one.

    One of my post that shows the RAID5 system of my client was able to transfer over 1000MB/sec.
  2. RAID 5 is not the fastest, RAID 0 is faster than RAID 5 for the same number of spindles. RAID 5 also incurs a write penality for parity calculations. Unless you have a dedicated hardware RAID controller WITH a processor you will actually steal CPU cycles for these calcs on RAID 5. RAID 5 is really only good for mass storage or write once, read many scenarios. If you want random IO speed, go RAID 0 or RAID 10.
  3. There are 1000's of raid5 using out there for database server...
    No one in the right mind would use software raid

    I would not use raid0, for about $100.00 hardware raid controller deliver over 230MB/sec.

    If you need speed use SSD, not RAID0
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