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Mac Pro RAID 5 Question

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Eric KuehnapfelMac Pro RAID 5 Question
by on Apr 27, 2008 at 3:32:06 pm

A few questions about RAIDs in a Mac Pro tower: I am interested in using the Mac Pro RAID card to stripe three internal 1TB SATA drives in a RAID 5 configuration. Has anyone done this and used it for HD video playback? I know RAID 0 provides the best performance but I would like the protection from disk failure and I'm wondering if RAID 5 is fast enough to use for editing purposes in Final Cut. Also, does anyone know how much actual storage would be available from the 3TB after the RAID 5 was configured? Last question - although I know it's not recommended, has anyone ever striped all four drive bays together and run the Mac OS from the RAID? I'm thinking four 1TB drives striped together in a RAID 5 configuration would provide the maximum storage and maximum protection possible in a single tower. But obviously if there's a potential for major problems with this setup then it's not worth it. Just curious if anyone has done it and what their experience has been. Thanks!



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Jerry LeeRe: Mac Pro RAID 5 Question
by on Apr 28, 2008 at 8:41:23 am

Hi Eric,

If you stripe 3 of your internal drives under RAID 5, say if you have 1TB each. Instead of getting 3 TB, you will end up something close to 2 TB for you to use .

Using 3 regular sata drives under RAID 5 will let you edit 4 streams of ProRes HQ according to apple's site. I think if you want to do 10 bit uncompressed HD, you will need to use 4 drives which like you said it's not recommended.

Caldigit has a similar products call caldigit raid card which they claims to have external ports to connect more drives(more speed?). Maybe you can call them up or check out their website. http://www.caldigit.com

Good luck



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Rufus JakobacRe: Mac Pro RAID 5 Question
by on Apr 28, 2008 at 3:39:12 pm

3 drives in RAID 5 will not be able to do do 10-bit HD. Each SATA drive is about 80MB/s, so 3 drives in RAID 5, the best performance you can reach is 160 - 170MB/s.

The 10-bit HD requires at least 165MB/s plus 20% safe margin, so you need to find a raid card that can support at least 220MB/s in RAID 5.

According to Apple, in order to playback 10-bit uncompressed HD, you need 4x SAS drives in RAID 5.
http://www.apple.com/macpro/technology/storage.html

Another alternative, in the lower price region, is CalDigit's raid card. The performance test page is here
http://www.caldigit.com/RAIDCard/raidcard_performance.html

It appears robust and a bit more refined (supports 4x internal & 12x external..RAID6...), not to mention less expensive.




Rufus Jakobac


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Eric KuehnapfelRe: Mac Pro RAID 5 Question
by on Apr 28, 2008 at 4:05:10 pm

Thanks for the helpful feedback. Not only were my suspicions confirmed but the CalDigit RAID Card is a great tip. I was only looking at the Mac RAID card and HighPoint RocketRAID. I'll wait until the CalDigit card ships in June before reconfiguring my current - and woefully small - Huge RAID array. Thanks again!



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Jon SchillingRe: Mac Pro RAID 5 Question
by on Apr 29, 2008 at 4:36:44 pm

Gentlemen,

I have read through the thread here & thought I would help out with a link to a comparison that we did a little while back:

http://www.caldigit.com/support/RAIDCard.pdf

We believe that this chart will go a long way towards helping you make the best decision in your purchase.

Thanks.



Jon Schilling | Sales Manager
CalDigit Inc.
Storage Solutions that work for un-compressed SD & HD, Photography & Audio
http://www.caldigit.com
Tel: 714-572-9889 X234
Fax: 714-572-9881
e-mail: jons@caldigit.com
Skype me: cgijon
msn: mpujon


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