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Re: dropped frames, slow raid write rates


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Re: dropped frames, slow raid write rates
by Bob Zelin on Jun 29, 2009 at 12:41:25 am

Hi Jason -
well, I reread your post, and I am an idiot. You said that you have an 8 drive SATA array - and you erased everything and now have 2 Terabytes. So you do not have an XServe RAID - you have an older 8 bay SATA array (I can't guess what one you own), but you must have eight 250 Gig SATA drives, all stripped together. You are getting 160Mb/sec write speed - which is barely enough to do uncompressed HD. Even though you need a theoretical speed of 118Mb/sec to do this, you need over 200Mb/sec for sustained playback. You said that it "used" to work - but at 160Mb/sec - you are pushing it. Again, 3 modern SATA drives in a new MAC Pro stripped RAID 0 will give you a higher data rate than this. I know its easy for me to say "spend money", when it's not my money, but the data rate you are getting on an old PCI-X system with older 250 Gig drives sounds typical, not slow for what you own.

BobZelin

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Current Message Thread:

dropped frames, slow raid write rates by Jason Longo on Jun 28, 2009 at 6:31:07 pm
- Re: dropped frames, slow raid write rates by Bob Zelin on Jun 28, 2009 at 7:49:40 pm
  - Re: dropped frames, slow raid write rates by Bob Zelin on Jun 29, 2009 at 12:41:25 am
- Re: dropped frames, slow raid write rates by walter biscardi on Jun 30, 2009 at 1:12:00 am
  - Re: dropped frames, slow raid write rates by Ramona Howard on Jun 30, 2009 at 3:01:50 pm

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