Slow relocation speed over ISCSI

[lordkiwi]

While using three diffrent brands of ISCSI Nas, Netgear, Thecus and Qnap I noticed the same issue.

Each nas gives a normal file copy performance of 60Mb/s and are quite stable

Download and upload performance of torrents store on the NAS are fast and stable.

However, using either move torrent on completion or Set download location when going from either Fixed disk to ISCSI the transfer rate drops to at best 1Mb/s. the write buffer does not flush during this period so eventualy the disk gets overloaded. This issue does not occure with either fixed to fixed or USB to Fixed or Esata to Fixed transfers. I also tested with and without jumbo frames enabled on NAS and Switch.

[kipi]

i can confirm this same problem with windows 7 initiator, solaris 11 iscsi target and utorrent 3.1.3.

[DreadWingKnight]

and what about 3.2.1 and 3.3?

[kipi]

with 3.2 it is a little better. In the start of the transfer it shows disk overloaded 100% for quite some time but after that it will settle, so i can live with it.

Meanwhile ordinary file transfers go fast with promised gbit speeds over iscsi so there should not be network overload or something like that.

[infusednz]

What is it with uTorrent and iscsi disks?

I have run the betas and alphas and they still haven't fixed this issue. uTorrent constantly bitches about disk usage @ 100%. It's not. Disk caching helps to a point, but even that seems to be bugged on a high end connection.

I have a Windows box directly connected to QNAP with 2x 1gbit. I am only pushing across 50mb/s and it gives me grief.

Suggestions?

(Also this thread should really be moved).

[kipi]

i ended up switching back to ordinary disk since iscsi speed was like only the half of the speed i will get normally, does not matter what version of utorrent i tryed, speed still sucked. Also it seems it does not matter how many seeds i have, speed is always better with ordinary disks.