3 Replies Latest reply on Dec 18, 2009 12:01 PM by Harm Millaard

    Should I disable RAID 0?

    StarPathOne

      I need some advice on what to do with my present system. I will be using CS4 Prod Prem for editing HD, AVCHD, SD, etc. ...here's the issue -

       

      I bought a custom built comp with -

      Antec 902 Mid Tower ATX case

      750Watt Corsair power supply w/140mm fan

      2-120mm fans

      ASUS P6T mobo

      Core i7 920 CPU

      Kingston V-Series SSD 128gb drive (for Win 7 + app's)

      2- WD Caviar Black 1TB

      12gb RAM (mushkin 4gbx3)

      nVidia Quadro FX 1800 + Elemental Accelerator

      +

      I have 4 USB external drives, and one Firewire 800 drive attached as well. (Unfortunately these are 'mostly' maxed out, but I can still defrag.)

       

      I had originally asked for the 2 WD Caviars to be set to RAID 0, but after I realized I would have no redundancy I asked for it just to be set up as two single drives. But, they kept it in RAID 0 . The RAID is controlled by the ASUS mobo. I am thinking a RAID 3, for now....eventually expanded to RAID 30 will be my best option.

       

      I know I'll have to get more HDD's, but I need to know what would be my best option.....

       

      1. Should I disable the RAID 0 until I can get more HDD's so I won't lose data? If so, how do I go about that....I would need to re-install Win 7 correct?

       

      2. Or, should I just go ahead, get 2 more drives and go with a different RAID (x)?

       

      3. If I have to get a RAID controller card for RAID 3, what's my cheapest/most reliable option? I just don't think I can swing the high end Areca cards right now.

       

      4. If I go RAID 3, and want to expand to RAID 30, will I have to run an external RAID tower instead of internal discs?

       

      5. If a drive goes down, how fast do I need to get the new drive in?

       

       

      Lost, dazed and confused....please help!

        • 1. Re: Should I disable RAID 0?
          Harm Millaard Level 7
          1. Should I disable the RAID 0 until I can get more HDD's so I won't lose data? If so, how do I go about that....I would need to re-install Win 7 correct?

           

          Win 7 and your programs are on the SSD, so there is no need to re-install Win7. To disable the current raid0, you have to know how it was setup. Was this done in the BIOS using the ICHR10 or the Marvell chip or was it done in software under Windows? Look in the user guide in section 4.4 for instructions on how to break out the raid to individual disks.

           

           

          2. Or, should I just go ahead, get 2 more drives and go with a different RAID (x)?

           

          Getting 2 more internals is always wise, since they are a lot faster than your current USB externals and these are already pretty full. I would make sure you get the identical model as your current WD Caviar Black. Also make sure that ACPI is disabled in the BIOS, because it can disrupt reliable operation of the Caviars in a raid. BTW, I'll explain later, but consider getting 3 Caviars instead of 2.

          3. If I have to get a RAID controller card for RAID 3, what's my cheapest/most reliable option? I just don't think I can swing the high end Areca cards right now.

           

          AFAIK Areca is the only controller card to offer Raid3. Also keep in mind that buying an Areca controller card is like buying a Vinten or Sachtler tripod and fluid head. Pretty expensive, but usually they last a lifetime. Now the Areca may not last a lifetime, but can certainly last a couple of PC generations.

           

          4. If I go RAID 3, and want to expand to RAID 30, will I have to run an external RAID tower instead of internal discs?

           

          Not at all, if your case is large enough. For instance in my case I currently have 2 BRD burners and 17 3.5" disks. If I want I can increase that to 2 BRD burners plus 21 3.5" disks of which 15 hot-swappable.

           

          5. If a drive goes down, how fast do I need to get the new drive in?

           

          As I said above, I suggest you get 3 WD CB disks. You can then configure them in a 4 disk raid5 array plus 1 hot-spare. The dilemma is that AFAIK neither the ICHR10 nor the Marvell support hot-spares, so you may need an Adaptec, Areca or 3Ware controller to get hot-spare support. If you don't have the budget for an Areca controller, then in the future you may find that the more affordable Adaptec or 3Ware card (or even Hightpoint or LSI) have no further use if the time comes for a raid3 card.

           

          With a hot-spare in a raid5 when one disk fails, you can take your time with getting a new one (although with reduced security untill replacement). If one disk fails, you will have reduced performance for less than an hour, maybe only for minutes, untill the hot-spare kicks in. You can easily take a week or even two weeks to get a replacement disk if you can live with the reduced security of not having a hot-spare available anymore.

           

          With hot-swappable drive cages you gain easy access to all your disks, like for instance the SuperMicro CSE-M35T, http://www.newegg.com/product/product.aspx?Item=N82E16817121405

           

          Hope this helps.

          • 2. Re: Should I disable RAID 0?
            StarPathOne Level 1

            Thanks Harm, that pretty much confirmed what I was thinking, and I think you're spot on with going on to the Areca card and at least 3 more drives. I dread the extra cost, but at least it will last.I will check the Adaptec cards though too.

             

            Does RAID 5 and RAID 3, in a 5 disc array give about the same speed/performance? I know RAID 3 is more for dedicated long reads, whereas RAID 5 is better for both read/writes, correct?

             

            In your opinion, is RAID 3 (or 30) really the way to go?

            • 3. Re: Should I disable RAID 0?
              Harm Millaard Level 7

              Raid5 can deliver more IO transactions, but the main advantage of dedicated parity (raid3) versus distributed parity (raid5 or 6) is that rebuilding an array with a failed drive is far less taxing for the system and allows you to continue working on your editing with much less performance degradation than a raid5 or 6. In general raid3 or 5 will deliver about the same perfomance, more than enough for video editing, it is only when a drive fails that raid3 has a distinct advantage.

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