I suspect it to be the cause of slow transfer rates on my Adaptec RAID 3805 RAID6 (5x Hitachi 2TB 7200 RPM) array.
Nodesoft Disk Bench only gets 100MB/s writes and 80MB/s reads (these figures are more in line my Windows File Copy performance)
http://www.nodesoft.com/diskbench
But I don't know why the following benchmarks report so much higher
Atto/HDtach:
Crystal:
However,
I think I have confirmed that my array is not aligned, but am not sure.
State of Array:
Results:
Alignment Calculator:
http://www.techpower...icles/other/157
Alignment Checking Script:
http://www.ocztechno...ll=1#post518021
Device ID: Disk #2, Partition #0
=======================================================
Total Volume Size: 5 TB
Starting Offset: 134235136 (131089 KB)
Partition Alignment: ** NOT ALIGNED!! **
VM Check Alignment Tool:
http://ctxadmtools.m...lignment10.html
My Calculation:
Formula: ((Partition offset) * (Disk sector size)) / (Stripe unit size)
Source: http://support.microsoft.com/kb/929491
Partition off set = 134235136b
Disk sector size = 512b
stripe unit size = 262144b
block size = 512b
answer = 262178
This is an integer, thus indicates the array is aligned. But this conflicts with the conclusions of the other calculators, so WTF? I have no idea what I'm doing lol :weep:
Array Info:
Adaptec RAID 3805 RAID6
HD 5x (Hitachi 2TB) Sector Size: 512Bytes
Stripe Size: 256K
Disk Format: GPT
Windows Disc mode, Basic or Dynamic: Basic
Answered
