Re: Fibre controlled raid (mediavault 4210)

Hi Alan!

You might want to check your read-ahead settings, e.g.

blockdev --getra /dev/sdb
blockdev --getra /dev/sdc
blockdev --getra /dev/hugeraid/huge

This should be a bigger number, like 65535 and not 128 or 256. You can 
change it with:

blockdev --setra 65535 /dev/...

Also mkfs.xfs might not be able to find out the underlying disk 
structure and might consider both devices as standard disks. This might 
hurt as well. You could check out the man-page for an explanation of 
stripe units and sizes, but as a start making the filesystem with:

mkfs.xfs -l su=32k /dev/hugeraid/huge

could give you a starting point.

       Hope this helps. Best,

                Frank...

Alan Jones schrieb:
> Hi All,
>
> Thanks to all for the help with tracking down playback options. I was
> hoping to wait until
> I had everything working to post and detail my solution, but I'm stuck.
>
> While the playback software side is sorted using djv I'm having issues
> getting the correct
> performance out of our mediavault 4210 which is hooked up with a Celerity fibre
> controller. Running the 2.6.20 kernel.
>
> I setup the two channels of the fibre controller using lvm2 software
> raid as follows:
>
> pvcreate /dev/sdb
> pvcreate /dev/sdc
> vgcreate hugeraid /dev/sdb /dev/sdc
> vgdisplay
> lvcreate -i2 -I4 -L2.27TB -nhuge hugeraid
> mkfs -t xfs /dev/hugeraid/huge
>
> The write performance is over 400MB/sec as expected, but read is only 120MB/sec.
> Unfortunately support is unfamiliar with linux so they've been unable
> to resolve it.
>
> The read performance is pretty much identical when I just work on a
> single channel, but
> write slows down as expected.
>
> I'd be grateful for any assistance.
>
> Cheers,
>
> Alan.
>
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-- 
-----------------------------------------------
Frank Hellmann     [email protected]     www.vfx.to
Reimarusstr. 17    20459 Hamburg    Germany


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