Performance on Linux of SSDs with hardware raid, good?

abefroman · 02-03-2012, 09:17 PM

Does anyone have performance feedback on Linux using SSDs with hardware raid.

For example raid 10.

Does the raid card degrade the performance fo the SSDs too much?

How necessary is raid redundancy with SSD drives?

TIA

jhwilliams · 02-04-2012, 05:25 PM

I'm running a RAID5 on a megaware card, with 5 Intel 600GB 320 series SSDs.

Here are a couple of metrics to give you an idea -- 100M sequential write and read:

Code:

jameson@raid5system:~$ time dd if=/dev/zero of=trash.bin bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 0.90293 s, 113 MB/s

real	0m0.930s
user	0m0.008s
sys	0m0.268s

jameson@raid5system:~$ time dd of=/dev/null if=trash.bin bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 0.0950648 s, 1.1 GB/s

real	0m0.098s
user	0m0.000s
sys	0m0.096s

If you have some particular workload and it's quick to run, I'd be happy to get back to you with the test result on this setup.

BTW, one of ten such disks I am overseeing has failed so far, but the failure rate is reportedly very low, below 1%.