raid - how many disks can saturate a 6GSAS controller ? :LSI 9260-8i

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This is my
build:

LSI 9260-8i: MAX
read throughput of 2,875 MB/s, write performance of 1,800
MB/s

24x SAS 10K RPM
drives

2x 100GB Dell SSDR (SATA) drives for ZIL and
L2ARC

All
plugged to same
controller.

With ZFS as
the file system, can the LSI9260-8i sustain the peak
loads?

Do I need dedicated RAID controller for
SSD's?

Can use any SATA RAID like
SAS6i?

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class="normal">Answer

The LSI 9260-8i has 8 x 6Gb/s SAS ports and that's the amount of throughput
you'll get.

However, depending on your
workload/application, disks rarely run at 100% throughput. It's more likely you'll reach
the max number of IOPS of your disks (unless you're doing bulk reads, streaming,
etc).

It also depends on how your SAS backplane
"exports" these disks. For instance, some backplanes will have as many mini-SAS or
standard SAS ports as there are disks. Others will use an expander like the SuperMicro
846E1 (24 disks for a mini-SAS x4
port).

SuperMicro has a chassis that (TQ
edition) that exports all disks individually, in that case you'd need 3 x 8-port HBAs to
connect all 24-disks. It makes cable management a bit trickier but has better
performance.

My suggestion is that you first
determine what workload your application will be throwing at this server before
considering it doesn't fit your needs. If it's a NAS/SAN appliance, pay
attentio

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