sas disk difference
Recently i request an offer from IBM partners for SAS disks 600GB 15K for two different storage- for Nseries storage and for DS3400 series storage. My surprise was when I received the offer , SAS disks for N series storage was 8 times more expensive. What the hell is the difference for this disks? How many models there is for SAS 600GB 15K. Why there is so big difference.
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Well lots of differences, but in a nutshell you get what you pay for, and they are worth it if performance, consistency and availability/uptime is worth it.
I work with a fair number of sites that have petabytes of data. Only one of them went down the path of using SATA disks (the other knew better) .. that SATA site has since bought 7 figures worth of SAS drives to replace the SATA drives. Too many lockups and performance was awful (for their datasets).
Go to the IBM site and look at the specs for the disks. It isn't just throughput and IOPs. Look at things like SAS disks are dual-pathed, and the firmware does background data scrubbing, and higher tolerance for vibration which translates into performance.
But 8X? You probably aren't factoring footprints. While you can buy a 3TB SATA disk, no such thing as a 3TB SAS drive (outside of the test labs). So you need more HDDs to get that much data.
If downtime and availability is important, go SAS. If you are flexible, go SATA. Your call.
I work with a fair number of sites that have petabytes of data. Only one of them went down the path of using SATA disks (the other knew better) .. that SATA site has since bought 7 figures worth of SAS drives to replace the SATA drives. Too many lockups and performance was awful (for their datasets).
Go to the IBM site and look at the specs for the disks. It isn't just throughput and IOPs. Look at things like SAS disks are dual-pathed, and the firmware does background data scrubbing, and higher tolerance for vibration which translates into performance.
But 8X? You probably aren't factoring footprints. While you can buy a 3TB SATA disk, no such thing as a 3TB SAS drive (outside of the test labs). So you need more HDDs to get that much data.
If downtime and availability is important, go SAS. If you are flexible, go SATA. Your call.
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dlethe, i am not talking about sata drives, my request was for 600GB SAS 15k 6Gb/s disk. And what i receive was 8 times difference.One SAS disk for N series storage cost more than 2000$.
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Are they Enterprise disks?
Possible they are 6.gb also which your controller may or may not be able to access.
Just a couple of thoughts.