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post #11 of 15
Quality controllers and quality drives are always a must when talking about hardware RAID.

RAID 5 and 6 both have their places. For data that is mostly write once and read many, and data that is sequential. RAID 10 is great for random r/w, or sequential, and is great for transactional DBs and VMs. RAID 5 and RAID 6 have write hits but are not necessarily slow. RAID 5 arrays should definitely stay under 8TB, and RAID 50s and 60s are also worth considering, depending on the workload.
post #12 of 15
Quote:
Originally Posted by ndoggfromhell View Post

I bought an Areca card off eBay and it's been a beast so far.

This. The performance and reliability of a RAID topology is always down to the implementation, not the topology itself. For parity-based RAIDs (levels 4, 5 and 6) either a true hardware controller (LSI, Areca) or a known decent software implementation (ZFS, Linux MD) will perform well.

Cheap on-board controllers are an absolute no-no.
Edited by parityboy - 9/16/13 at 10:43am
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post #13 of 15
Thread Starter 
thanks for your advice i was think of going with an LSI or Adaptec cards and about the £400 mark witch is about $600 does any body have any good recommendations
post #14 of 15
LSI MegaRAID 9260-8i, or the 9261-8i (same thing, just low profile) is what I recommend. I use one myself, and several others around here also have them. Great cards and support RAID 0/1/5/6/50/60/10.
post #15 of 15
I've had excellent success with LSI 9622-8i controllers in the last few servers I built. No hiccups, great performance.

Anybody that tells you RAID 5 and RAID 6 are bad hasn't spent any time running a modern high-speed hardware RAID controller. I'm not talking about some little 2-4 channel Promise or SIIG piece of crap, but something 512MB+ of it's own local cache, a RISC processor for parity calculations, and a battery-backed cache module.

The last server I built had 7x 3TB Hitachi Ultrastar Enterprise SATA 3 drives in RAID 6 plus a hot spare, a 9266-8i controller with 1GB cache and a battery backed cache module, and that thing would do 850 MB/sec sequential -AFTER- the 1 GB cache was flushed.

Greg

p.s. RAID 5 is unacceptable with any more than about 4-5 disks these days due to the large size of the drives, and potential for unrecoverable read errors during the rebuild. You should ALWAYS be using Enterprise-grade SATA or SAS disks when doing RAID 5, without exception. Having a URE during a rebuild on RAID 5 means total array loss.
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