15k sas 3gbps vs 10k sas 6gbps drives

gettothechopper · 27 May 2011 at 10:57

we currently use servers with a raid 5 array of 5 x SAS 15k 250GB 3.5" 3gbps drives

we are speccing new servers with a raid 5 array of 4 x SAS 10k 600GB 2.5" 6gbps drives

any one have a clue if this would be faster / slower / the same? (roughly)

thanks!

LizardKing · 27 May 2011 at 11:07

Access times will be slower but throughput should be better. Though I'm not totally convinced that duel port drives are actually any quicker?

edit - just noticed your going to 2.5" as well, that should offset some of the performance loss going to 10k

gettothechopper · 27 May 2011 at 11:13

do you mean that the smaller platter size would actually increase performance due to the head having less distance to move?

matthab · 27 May 2011 at 11:15

Id say a small loss but not enough to worry about. RAID5 isnt the quickest RAID about so I would worry about it. Mechanical Hard drives cant make use of 6gbps it barely uses 3gbps.

For through put and redundancy RAID10 is the shizzle.

jaybee · 27 May 2011 at 11:33

It would be slower. Does that help? Surely you should be measuring performance and testing this out first?

daz · 27 May 2011 at 11:34

gettothechopper said:
do you mean that the smaller platter size would actually increase performance due to the head having less distance to move?

We find 2.5" 10K drives offer similar random access times to 15K 3.5" drives.

Vanilla · 27 May 2011 at 12:05

It would be slower.

- Firtly you're going from a 5 drive set to 4 drives. This is a drop in overall capability IF you push your drives.
- The 15k drives can do about 180 IOPS (worst case, random), the 10k drives can do about 130 IOPS (slightly more due to the smaller size).
- You won't notice any improvement with the move from 3Gbps to 6Gbps.

If you're putting these servers under any kind of load it may become noticable.