As our applications are commercial available software, we don't have any influence on their buffering behaviour. But it's important that the iSCSI targets honours SCSI sync cache requests to ensure that critical data is flushed to disk. I couldn't do any benchmarks last week cause I had to travel to...

RAID-5 is not the best mode if you need good performance. RAID-1+0 would show better throughput and redundancy. Sure, but RAID5 delivers us enough performance for our projected applications. The main objective is storage consolidation. Also I'd like to point out that the total performance depends o...

DJ_Datte,

read my thread "some questions", there was the answer from valery (buffering:"yes" at the imagefile line.

Hi, Thank you for sharing your test results! No problem. Will do some further benchmark with kind of sophisticated access patterns to see where the improvements of buffering are. It seems your test ImageFile is placed on a single drive's partition (is it an IDE drive?). So there is no benefit from u...

Did some quick IOMeter benchmarks with different settings: First column is IO/s, second one is MB/s. Maybe I'm making some typical workload and test the whole thing again. sync, unbuffered sync, buffered async, unbuffered async, buffered SMB Linear Read 201,12 20,13 158,71 15,94 189,91 19,45 153,03 ...

Windows can do it too, if you dont require unbuffered reads only. And I am sure more people will be interested in a "fast" networked iSCSI, as iSCSI and SAN's become more popular with the buisiness world ? We did some experiments on a linux based iSCSI target with different buffering meth...

2) No. There is no buffering for ImageFile devices.

Are there are plans for supporting this in the near future? Would speed up some things very much.

Hi,

1) Are there are reasons not to use asynchronous mode?
2) Are reads and/or writes to image files buffered?
3) I always used mksparse -o but the whole file is even on a blank disk heavily fragmented. Do you just open the file for writing without telling the win32 api how big the file would be?

Hi...

What's the difference between turning "asynchronous mode" on and off?

Are reads and writes to SPTI devices or image files are buffered?

Why is mksparse always creating heavily fragmented files on the host system?