Strange atto score

seraglioseraglio
edited April 2005 in Hardware
attachment.php?attachmentid=15778&stc=1

Has anyone seen an atto like this before?

My PC crashed and I am rebuilding it with a RAID0 setup for data. My setup is 2 WD 120gig hdd on a HighPoint RocketRaid 133.

However when I set this up I wasnt sure of the relationship netween cluster size and stripe size.

So I set up a 256k stripe and 2k cluster on this 100gig primary partition. Worse yet i didnt realize you could run BOTH RAID channels, so I set it up master slave. I'm sure theres numerous other things I screwed up as well.

Despite that it runs fine (pretty quick to me) and gives me this score. Whats going on? Is it measuring in kilobytes? Its not possible to have a score above 133mb/s is it?

Comments

  • TexTex Dallas/Ft. Worth
    edited April 2005
    Just curious what might of caused you to use a 256k stripe and a 2k cluster.
    Formating with a 2k cluster is a unique and highly unusual choice in and of itself for anything but ....... combined with your 256k stripe well .... it's "special" to say the least.

    Tex
  • seraglioseraglio
    edited April 2005
    I hate to ask this, I feel like such a newb. But how do I post attachments? I fumbled away at it last nite and I could see my screenshot in the post but today its gone. I successfully uploaded the attachment .jpg, but getting it to show in the post was a bit of a bear. Can someone point me to the newbie faq?

    I'll repost the results but it shows READ speeds as high as 900 with WRITE speeds between 20-90.

    As to why I chose these numbers, lack of knowledge. Theres a lot of conflicting info about clusters/stripe sizes. I just found this site and had already created the RAID set based on other (mis)information. Like I said, I had no clue what I was doing, still trying to sort it out.
  • TexTex Dallas/Ft. Worth
    edited April 2005
    Go to the advanced mode for replying or posting and use the "attachements" thing. Be careful as they have a size limit!

    For IDE/SATA raid a stripe of 16 to 32k is usually the sweetspot for general usage. You never want a cluster smaller then the 4k default.

    Usually benchmarks show a gain with a 8k to 16k cluster size using a 16k to 32k stripe.

    Unless you want to play a whole lot to find some small gain use 16k/16k in general. On any new setup if I had only one shot and didnt want to tune and tweak forever I would choose 16k/16k.

    When you atto remember to change ONLY the length of the test to 32mb.

    Tex

    With raid-0 be sure you plan a way to back it up. Your chances of losing it all are much greater.
  • seraglioseraglio
    edited April 2005
    trying attachment again...

    attachment.php?attachmentid=15790&stc=1


    I am going to manage attachments, getting my file, uploading it, and closing window.

    That alone does not make it viewable in posting windoow.

    If I click on the attachment it brings me to a page where I cn see the url. Ive cut and pasted that URL into the post as an image. Is this the procedure?

    I can see it from this computer, but I could not see it from work later.

    Try as I might I cannot find a 'forum faq' jusr general rules of coduct type stuff. Please help.
  • seraglioseraglio
    edited April 2005
    Thanks tex think I figured it out, its case sensitive, .jpg not .JPG

    What do you make of this weird atto?
  • TexTex Dallas/Ft. Worth
    edited April 2005
    I have seen ATTO's like that but they are usually a fluke. Reads that high are not possible in real life.

    Tex
  • lemonlimelemonlime Canada Member
    edited April 2005
    Those are some very odd read scores. I'm not sure why that is occuring, but the writes are about where they should be with those WD drives. (Maybe just a little on the low side, depending on how full your drive is). I dont think your odd cluster/stripe sizing should have anything to do with the atto. If you do rebuild, I would second Tex's recommendation of 16K/16K. That seems to be a good overall configuration. You could also set your stripe to 16K and leave your windows clusters at the default 4096K. This would likely yeild you more predictable results.
  • TexTex Dallas/Ft. Worth
    edited April 2005
    I have had a couple installs that would barf up scores like that from time to time. But they are not reproduced with any other benchmark program so its a problem with atto.

    My $600 state of the art scsi hardware raid cacheing disk controller with on board risk cpu and 6 15k drives can't do a third that in a pci-x slot on a dual opteron.

    With scsi hardware raid a much larger stripe cache is usually used.

    With ide raid 32k/16k or 16k/16k is just about right on!

    Tex
  • seraglioseraglio
    edited April 2005
    I'll definitely rebuild when I am done restoring my lost data (which is not on this array). Thanks for the advise. My other malfunction was the fact I built the array as master slave. I think I read somewhere someone say that WD's like to have jumpers removed rather than master setting, and of course each drive on its own channel. Is this the best way to configure RocketRaid 133?
  • TexTex Dallas/Ft. Worth
    edited April 2005
    WD's are the trickiest ones sometimes and how they need to be jumperd even depends on the controller.

    Its better to have a two drive array spread across multiple channels. Look at the top of the drive and see how to jumper it.

    You want them as CS (cable select) or master usually but some controllers want them jumpered as a "single drive" and the diagram on the top should outline what that is.

    If I were you I would try cable select first, master second and "single drive" last.

    And put the drive on the end connector of the cable!

    Tex
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