Disk performance

m4a2t0t · Post by **m4a2t0t** » Thu Jan 08, 2009 4:07 pm

Take a look at these and tell me whatca think.

RAID 1+0, 256KB Stripe, Read/Write Caching enabled.

40GB WD 400JB PATA

Tyan Thunder K7
2x Athlon MP 2400
Adaptec 2410SA
4x WD2500KS
1GB Registered ECC DDR
Windows Server 2003 SP2

I have the newest mobo BIOS, RAID Card BIOS/Drivers. It seems the only available drivers for the AMD762/768 are the ones that came with windows.

The burst speed on the RAID array seems very slow to me.

Thanks for any help
Matt

YARDofSTUF · Post by **YARDofSTUF** » Thu Jan 08, 2009 4:28 pm

RAID 10, 256k stripe, not really surprising. Is RAID 5 an option?

m4a2t0t · Post by **m4a2t0t** » Thu Jan 08, 2009 5:26 pm

I had it setup as RAID 5 with 3 disks and it was worse. I am going to try RAID 5 again with the 4 disks and see how it goes. SHould I go with 256K stripe again? I am mainly storing multimedia files.

YARDofSTUF · Post by **YARDofSTUF** » Thu Jan 08, 2009 5:43 pm

ive usually gone with 32k or 64k, I did 128k once and it was slower.

Raid 5 should increase the read times.

m4a2t0t · Post by **m4a2t0t** » Thu Jan 08, 2009 6:10 pm

Ill try a smaller stripe size. Will post some new benchs whenever the array finishes building.

m4a2t0t · Post by **m4a2t0t** » Thu Jan 08, 2009 9:26 pm

4x250GB WD2500KS RAID 5 - 64K Stripe

Mark · Post by **Mark** » Thu Jan 08, 2009 10:19 pm

i'm no expert on this kinda thing, but that seems kinda slow for raid, unless raid-5 is slower than raid-0 ? ?

YARDofSTUF · Post by **YARDofSTUF** » Thu Jan 08, 2009 11:58 pm

Mark wrote:i'm no expert on this kinda thing, but that seems kinda slow for raid, unless raid-5 is slower than raid-0 ? ?

Read times should be on par or better, write times slower, due to the backup ability.

Something is really sucky there.

m4a2t0t · Post by **m4a2t0t** » Fri Jan 09, 2009 2:39 pm

Same RAID 5 with 256k Stripe

bilbus · Post by **bilbus** » Wed Feb 04, 2009 11:35 pm

Your benchmarks are quite slow. My single drive desktop on atto benchmark was 110mb for both read and write.
Raid 5 is much slower then raid 0. It also has a huge slowdown when a drive fails.

Raid 0 is not safe, and should never be used on data

As for raid 10, its generaly faster then raid 1 or raid 5.

Raid 1 is about as fast as a single drive.

Using HDtach
One of my raid 5 servers 6x750gb SATA - gave me 319mb burst, 174 read.

One of my raid 10 servers 4x146GB SAS raid 10 - gave me 316mb burst, 195 read.

Raid 1 on that same server 2x146GB SAS raid 1 - gave me 191mb burst, 114 read

As you can see the raid 10 was faster then the raid 5 ... if it was 6 disks on raid 10 it would have been even faster. the raid 10 server was 15k rpm SAS drives so thats helps alot also.

I would have posted the pics, but i cant seem to attach em here ... all i can do is link pics and they are not online.