Bad Read Performace only 31MB/s !

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09-17-2009, 09:55 AM
juergenb52

Bad Read Performace only 31MB/s !

Hi,

i use a ACER H340 Homeserver, with ATOM 230
.
I have added one a WD 1TB Disk and a System Disk of 120GB (2GB FAT32) for DSS v6 Lite.

I use some benchmarking tools from Heise (ct´ ; benchmarks for USB Sticks).
I created a 5GB Testfile, the software will first create the file and then reads it.

It gives me a write performance of 57MB/s and a read performance of 31MB/sec.

Write 57 from PC to NAS
Read 31 from NAS to PC.

System:
Intel OEM Board
Atom 230
2GB Memory
Marvel GBit NIC
WD Green 1TB
Seagte 120GB for System
64 Bit OS!

3COM Officeconnect GBit Switch - 5 Port

Has anyone confirmed bad READ performance?

Thanks

Jürgen
09-17-2009, 05:58 PM
symm

What type of drive is it (model #, interface type etc)

Please Note:
Writing to a single disk will result in slower speeds than writing to RAID array

try testing with raid array
09-21-2009, 09:02 AM
juergenb52

Hi,

writing is not the problem. The system write with 55-60MB/sec.

The Problem ist reading, here the system is slow at all!

I know that writing could be slow with a software raid or a bad disk.

But reading is slow with cifs!
09-21-2009, 02:10 PM
juergenb52

Solved: Bad Read Performance

After a change in the test scenario the read performance seems to fine.

With totalcommander it could test a read performance of 55MByte/sec and a write performance of 57MByte/s in a RAID0 with one disc!!
12-02-2009, 12:11 AM
wta

Quote:

Originally Posted by juergenb52

After a change in the test scenario the read performance seems to fine.

With totalcommander it could test a read performance of 55MByte/sec and a write performance of 57MByte/s in a RAID0 with one disc!!

Hi,

I've also found writes faster than reads, in our case using block mode iSCSI. Not completely got to bottom of it yet. Had a similar issue with OpenFiler, although with DSS the gap seems slightly smaller. This is on a HP DL380G5 with P400 SmartArray 256MB BBWC and 8x SAS disk in RAID6. Get around 60-90MB/sec write and 30-40MB/sec read.

Just wondered if you could elaborate on the scenario issue? Do you mean you tweaked how you were measuring performance and got a faster speed or did you make some changes to DSS config? I'm also not clear on the significance of RAID0 with one(?) disk.

Thanks for any feedback, Andrew
12-02-2009, 06:25 AM
johnsonabigail23

Quote:

Originally Posted by symm

What type of drive is it (model #, interface type etc)

Please Note:
Writing to a single disk will result in slower speeds than writing to RAID array

try testing with raid array

Hi..

yes, maybe.. I have also tried that one.