Re: Linux software RAID assistance

[Phil Turmel <philip@turmel.org>]

On 02/19/2011 03:43 AM, Simon Mcnair wrote:
> Phil,
> Sorry for the spamming, but I'm just keeping you informed :-).
> 
> proxmox:/home/simon# ./block2gz.sh sdd /media/ntfs3g/sdb
> 953869+1 records in
> 953869+1 records out
> 1000204886016 bytes (1.0 TB) copied, 95384 s, 10.5 MB/s

[trim /]

> Have just started sdj,sdk,sdl,sdm.  I was thinking of renaming the
> .gz's with the serial number as this would seem to me as more useful,
> is this a good idea ?

Yes.  I guess they'll finish some time tomorrow?

> These numbers are not at all reflective of the drive or controller
> speed as I took the lazy route and was writing 2 sets of images at the
> same time to the same drive and in addition gzip was also running
> (although not really stressing the system from what I could tell).

The CPU was busy, but not overloaded.  The per-drive data rates were 1/5th to 1/10th what I would have expected.  The Asus P6T SE motherboard has a lot of bandwidth.  Something's odd.

Can you attach a copy of your dmesg?

> I suspect also that the drives may be pretty fragmented as the space
> was not allocated at the start of the write, so that may have had some
> impact too.

Ntfs-3g can push 70+ MB/s onto my heavily fragged Windows laptop partition with only 50% of a Core2 Duo.  I doubt that's it.

Phil