1 TB SATA Drives

[kopper27]

hi guys

I usually wrk with SAS - FC hard Drives....

But now I have a customer that has 19 Hard Drives 1 TB SAta.

What would you recommend to go with this.

First I think RAID 1 for write Apps and Raid 5 for Read Apps.

What about LUN design.

I was thinking for example a big RAID 5 8 Hard Drives and 700-800 GB Luns? and the similar stuff for RAID 1?

what do you think? is that OK you recommend another setup?

thanks a lot

[idle-jam]

a typical sata gives about 70 IOPS per disk. a disk say 8 disk would only give you about 560 iops (without any raid penalty). I would suggest doing a RAID 1 for better IOPS performance.

[kopper27]

got you

so RAID 1is the way to go..... now I have convince my customer that he needs RAID10 and he will more space now...

thanks any other thought?

[AndreTheGiant]

A big RAID5 on a lot of disks can create some bottleneck on write I/O.

If you need best performance as you can go to a RAID1+0.

About LUN sizing, be sure to stay under 2TB-512B for each LUN

Andre

[DSTAVERT]

Simple IOS calculator  http://www.wmarow.com/strcalc/

[kopper27]

If I go with RAID 5 how many disk?

If I go with RAID 10 how many disk guys?

[AndreTheGiant · Accepted solution]

With RAID10... more disks as possible

With RAID5 it depends by your storage type... Some suggest no more than 7-9 disks... other (like Equallogic) also 15 disks.

With RAID5 be sure to have a global hot spare.

Andre

[kopper27]

thanksa  lot guys

I will go with RAID 10 - 8 Hard Drives,  1TB Size

900 GB Luns for Vmware, like 4 DataStores o Luns in total