Slow speed with Open-E and vSphere ESXi 4

[hugor99]

Update: I've done more iometer testing with RAID 10 arrays (using 6 intel x-25M SSDs) using 512k, 256k and 128k stripe sizes. The best results I got were at 128K stripe size.

In IOMeter, I got +200 MB/s transfer speeds for 16k and 32k both random and sequential. I used 8 workers and 64 oustanding ops.

I pretty much always got terrible results the lower I go, is that normal? Like 6MB/s writing (both random and sequential) at 512b.

Everything with the VMs seems pretty fast now, I can copy a large file from one folder to another at about 35MB/s, but any time I try to clone a VM it is incredibly slow, like 1MB/s. I haven't had the patience to let it complete yet. Anyone have any suggestions?

[hugor99]

Update:
I'm getting great speeds with IOMeter right now with the following settings:
MaxRecvDataSegmentLength 65536
MaxBurstLength 524288
MaxXmitDataSegmentLength 65536
FirstBurstLength 262144
MaxOutstandingR2T 8
InitialR2T No
ImmediateData Yes

My VMWare paths are configured for roundrobin, IOPS of 1.

The speeds I'm getting are:
Size Seq Write Seq Read Seq 50% Rnd Wr Rnd Read
512b 6.9 35 16.8 15 35
4K 99 174 147 108 174
16k 222 223 300 222 222
32K 224 208 307 222 210

So I'm totally happy with that so far, but still I max out at 1.5MB/s read and 1.5MB/s write when cloning a machine. I've checked the switches for collisions or something, and can't find anything. And the 50/50 speeds look nice and fast, so I have no idea what is going on there.

[hugor99]

Fixed the table so it was a bit more readable:
Size______Seq Write_Seq Read_Seq 50%__Rnd Wr___Rnd Read
512b_____6.9_______35_______16.8______15_______35
4K_______99_______174______147_______108______174
16k______222______223______300_______222______222
32K______224______208______307_______222______210