HP Proliant Smart Array P410 mix 15k & 10k SAS disks

Guys/Gals,

I have been checking the internet and think I know the answer, your input to the contrary would be appreciated. I have a HPDL360G6 with P410i/256MB controller. Currently 1 array with 4x300GB in RAID5, share OS and SQL/logs. We have severe disk IO contention.

I will be adding 4 more 300GB SAS disks, paired as two RAID1's, one for SQL DB and the other for SQL logs to alleviate the disk IO.

Considering the existing array is 10k disks, could I benefit by creating the next two arrays with 15k disks? I will be looking to increase the BBWC from 256 either 512/1024.

The note I found in the quick specs suggest that the system bandwidth will be negotiated down for drives, hba etc These components should operate at the same data transfer rate.

Any ideas?

15moorgateAsked:
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andyalderConnect With a Mentor Commented:
Additional arrays are independant of the original (apart from gobbling up a bit of cache which you're upgrading anyway) so the new arrays with fast drives will be faster than the new arrays with slower drives; they shouldn't affect the other current array.

The spin speed isn't negotiated downwards, nor is the SAS bus affected since there's one dedicated SAS lane per disk with a P410 connected to an 8 disk backplane. The note you found refers to putting 6Gb disks on a 3Gb controller or vice versa, that bus speed is negotiated to match the slowest, as I said previously it's on a per-lane basis anyway.
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15moorgateAuthor Commented:
Top man Andy. Thank you sir.
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