Re: [zfs-discuss] Re: Re[2]: 6410 expansion shelf

2007-03-30 Thread Roch Bourbonnais
Le 30 mars 07 à 20:32, Anton Rang a écrit : Perhaps you should read the QFS documentation and/or source. :-) I probably should... QFS, like other write-forward and/or delayed-allocation file systems, does not incur a seek per I/O. For sequential writes in a typical data capture applic

Re: [zfs-discuss] Re: Re[2]: 6410 expansion shelf

2007-03-30 Thread Roch Bourbonnais
Le 30 mars 07 à 08:36, Anton B. Rang a écrit : However, even with sequential writes, a large I/O size makes a huge difference in throughput. Ask the QFS folks about data capture applications. ;-) I quantified the 'huge' this as such 60MB/s and 5ms per seek means that for a FS that requ

[zfs-discuss] Re: Re[2]: 6410 expansion shelf

2007-03-29 Thread Anton B. Rang
However, even with sequential writes, a large I/O size makes a huge difference in throughput. Ask the QFS folks about data capture applications. ;-) (This is less true with ATA disks that tend to have less buffering and much less sophisticated architectures. I'm not aware of any dual-processor A