File transfer speeds seem very slow.

Sorry for the confusion, I am building the array after the install. I just happened to notice during the install that one of the disks was listed as NTFS.

I have reinstalled, rebuilt the array (averaged 50-80MB/s according to /proc/mdstat). I have copied some data to it.

Upload speed: 20-30MB/s (copying data to the drive from another machine).
Download speed: 30-40MB/s (copying data to another machine from the other machine). Significantly up on 22MB/s previously.

..again I notice that one and somethings two drive lights are on a lot more than the others. Two of the drives are slightly older and seem to have different firmware but are the same model id for Western Digital Caviar Green (64MB). Maybe the older firmware is slightly slower.

Best / anyway to align the drive firmware ?

Thanks
RB
 
Ok, looks like the issue could be related to these drives being advance format drives and so having to align the partition to the drives geometry

Now to find an easy to understand guide for doing that.

RB
 
Right, the drive where the light kept on whilst the others were flickering had been tested with WD drive testing tool and has failed with too many bad sectors.

I have also used 'parted' to align to 4k sectors on the remaining 4 drives. The array is rebuilding now with an eta of around 260 minutes (:() but with a throughput of 90-93MB/s :). Here is the link to the WD article on setting 4k blocks.

seems better but the proof will be with the copying to and from the drive.

Only 257minutes to go plus fs formatting time.

RB
 
Last edited:
Ok,

70->80MB/s download or upload from a PC from 2 raid0 vertex2 ssd's

Much happier. Hopefully when I get the faulty drive replaced and it rebuilds it will maintain the same speeds. Hopefully the Perc6 should come soon and then it all starts again.

RB
 
A few more stats for you.

I started copying my movies from the NAS back to a backup single drive on my workstation. 740GB. The speed dropped to 15MB/s within 5 minutes.

I then rebooted the workstation and the switch and it is now running at 53MB/s.

Results from HDParm;
[root@nas hdparm-9.36]# hdparm -tT /dev/md0

/dev/md0:
Timing cached reads: 6280 MB in 2.00 seconds = 3145.43 MB/sec
Timing buffered disk reads: 590 MB in 3.01 seconds = 196.23 MB/sec
Click to expand...
Would be interested to know others benchmarks for like systems to know if the results are as expected / slow or, deep breath, actually quite good.

The Perc6 has arrived but I am still awaiting the cables. The motherboard in the NAS PC only has one PCI x16 slot and no on board video :(. New motherboard time. Have ordered a dual PCI-e x16 board as the Prec6 is a PCI-e x8 card so the PCI-e x1 slots are no good.

Thanks
RB
 
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