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iSCSI strange behavior with random write (utorrent)

WingDog
Guide

iSCSI strange behavior with random write (utorrent)

Hello,

I'm using RND6 Pro with E7300/4Gb/6*2Tb WD Black (x-raid/raid5 mode) and windows 8.1 x64 as client.

all NICs are Gigabit. One NIC at client and one NIC at RND.

Later I had FW 4.2.27 and one LUN (500Gb) connected to client as utorrent downloads target.

I was able to download 2-3 torrents with ISO files (linux distro or MS distro) at the same time, before "disk overloaded 100%" at utorrent.

 

Now I've updated to FW 6.3.5 (nothing else were changed!), created Thick LUN, conncted it to client and start utorrent.

 

Even with one torrent file (two ISOs) I got "disk overloaded 100"

100.JPG

 

Need any advice about this problem.

 

P.S. Please don't advice to use smb/cifs - I need iSCSI disk.

 

Message 1 of 7
mdgm-ntgr
NETGEAR Employee Retired

Re: iSCSI strange behavior with random write (utorrent)

Is the LUN thin/thick?

Did you enable bit-rot protection?

What about snapshots?

What about sync writes?

Message 2 of 7
WingDog
Guide

Re: iSCSI strange behavior with random write (utorrent)

Hello, mdgm.

 

LUN is Thick.

no, bit-rot protection is off (default setting)

no snapshot (disabled)

 

sync write is allowed (default setting)

Message 3 of 7
mdgm-ntgr
NETGEAR Employee Retired

Re: iSCSI strange behavior with random write (utorrent)

Can you disable sync writes and see what difference this makes?

 

Do you recall which firmware you were running when you created the LUN?

Message 4 of 7
WingDog
Guide

Re: iSCSI strange behavior with random write (utorrent)

mdgm

I think this is one cause

https://community.netgear.com/t5/ReadyNAS-in-Business/MPIO-slow-speed/td-p/964959/highlight/false/pa...

 

with Disabled sync writes it's a very-very little faster.

 

 

FW R4toR6_latest-beta.bin from your post at previous forum.

 

Message 5 of 7
mdgm-ntgr
NETGEAR Employee Retired

Re: iSCSI strange behavior with random write (utorrent)

If your speed when not using MPIO is a lot faster then that would suggest the problem is with how you are using that.

Message 6 of 7
WingDog
Guide

Re: iSCSI strange behavior with random write (utorrent)

there is no difference, MPIO or single path.

now I believe that there is one root cause.

check MPIO thread.

 

Message 7 of 7
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