The card is a PCI-X 133 although there is also a PCI-E 8x card.
The PCI-E card uses a PCI-X 133 bus on the card so there shouldn't be
much of a difference. The card supposedly can do the speeds
but I haven't been able to get
>Could you explain in more details what you have and what you are
doing?
14 x WD raptors (73GB), 3.2GHz dual EMT64, 2GB, Supermicro motherboard.
This is essentially a box that needs to backup data coming
in over infiniband. The data will be written in 16mb files.
>It depends, large streeam O_DIRECT writes to preallocated space is
>probably worth experiementing with. I would also let mkfs.xfs know
>about the underlying RAID topology and see if that helps.
Thanks. Is opening files on the fly till a bit slow as it used
to be on IRIX? Sounds like preallocating and opening is the best
way to go then? Is there a fast way to preallocate in XFS (my xfs experience
dates back a few years on irix and I need to catch up on what's been done
since then). I did try sunit=256 and swidth=256*14 (I'm not testing raid
5/6
yet) but it didn't seem to help much. I also tried setting both to zero
but it still didn't help.
>600MB/s is a fair amount of bandwidth, you probably need 2x or 3x this
>in the system to achieve this and depending on what you are doing that
>might not even be enough --- more details?
It's a fairly straightforward case... 16MB files all written
sequentially. In this case, would it be better to use one thread
for writing or multiple threads?
Thanks.
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