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Drives on a RAID card & RAID 1 rendering

post #1 of 7
Thread Starter 
Hey there,

I'm building a new workstation. Data safety and redundancy is key. I want to put two SSDs in RAID 1 for the OS and software, and couple of HDDs in RAID 3 or 5 for storage. For this i will most likely use a RAID card.

My question is, will all the drives be immediatly be seen by the PC in the BIOS through the RAID card before i install the OS? Or do i need to plug the SSDs in the available SATA600 ports on the motherboard, set up the RAID 1 and then install the OS?

Also, a seperate question: What happens when a HDD crashes while rendering, when it is in a 2 drive RAID 1 array. Will the rendering continue on the drive that still runs, or will rendering stop and fail?

Please advice.

Thanks.
Edited by DutchChilles - 3/27/13 at 2:30am
post #2 of 7
Yes, you'll have to build the RAID 1 array with the two SSDs first, then install Windows.
In RAID 1 or RAID 10 the failure of one drive will not effect an on-going operation nor the in-flight I/Os.
It takes at least 3 drives to build a RAID 5 array and would not be recommended if your main apps tend to be write heavy due to the RAID 5 write penalty.
Better to go with four drives in RAID 10.
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post #3 of 7
Thread Starter 
Thnx for the answer smile.gif

I'm set on doing a RAID 3 for the HDDs, this is recommended by some bigshot on the Adobe forums.

As for the SSD's: When i plug these in the RAID card, will the BIOS see them so that i can build the RAID 1, or do i need to plug them in the mobo? My first guess is the mobo, because there will be no OS and drivers installed yet.
post #4 of 7
Connect the SSDs to the raid card; during boot you'll have the opportunity to build the array using the BIOS of the raid card.
Well, bigshots aren't always correct now are they? See: http://www.thegeekstuff.com/2011/11/raid2-raid3-raid4-raid6/ RAID 3 has the same write penalty as RAID 5, and like I said, if what you do is disk write intense you'll be very disappointed.
Again, I highly recommend RAID 10.
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post #5 of 7
Thread Starter 
Ok thanks, i will reconsider the RAID config for storage then, although the guy on the Adobe forum looks reliable and it sounds like he knows his stuff.
Link: http://forums.adobe.com/thread/525263

Building the RAID array on the card doesn't sound to complicated then.
post #6 of 7
Quote:
Originally Posted by DutchChilles View Post

Ok thanks, i will reconsider the RAID config for storage then, although the guy on the Adobe forum looks reliable and it sounds like he knows his stuff.
Link: http://forums.adobe.com/thread/525263

Building the RAID array on the card doesn't sound to complicated then.
Yes, the info presented is accurate and well explained. But I'll say again, the write penalty associated with parity computation is significant for RAID 3, 5 and 6. If what you do most often is write intense *AVOID* RAID 3, 5 and 6!

The cluster and stripe size info, while accurate, leaves out how to chose a cluster and stripe size. Regarding "chunk size", note that most Windows operating systems (OSes, like Windows 7 and 8, Windows Server 2003, 2008 and 2012) have multi-block/page fetching turned on by default. In large commercial shops where I've worked we used RAID 10 exclusively after performance testing each type of RAID against the company's data. During that testing, what most companies discover is that stripe and cluster size choice has a heavy impact on performance. Thus most large commercial installations use many different arrays of varying stripe and cluster sizes, e.g. smaller sizes for real-time/online data and larger sizes for database data. And even larger sizes for data warehouse data. Now, be aware that larger cluster sizes tend to waste space but often has better performance for larger fetch sizes. Smaller cluster sizes use space very efficiently but will slow performance for larger fetches. For the *home user*, when choosing cluster size, take some advice from Microsoft, they use 8k for NTFS files, this will most often strike a good balance point between space utilization and performance.
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post #7 of 7
Thread Starter 
Awesome information, thanks! smile.gif
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