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Unpacking/Moving Performance Issue

Posted: January 20th, 2012, 6:39 am
by MoeenD
Hi Guys,

I got this problem recently on a new setup, I hope someone here can help me or point me in the right direction. So when sabnzbd is at the unpacking or moving stages (hard to figure out which one) and I am playing a HD movie (over the network) from the same drive my video player (MCP-HC) stops and hangs, then becomes unresponsive, I don't remember have this type of issue before. After the unpack/move is finished I would have to re-open the movie again. I also tried this from another system with the same result.

My sabnzbd dedicated box setup is a Windows 2008 R2 box, and the drive that I am downloading to and reading from should have enough bandwidth to handle this, using and Intel RAID Controller SRCSASRB, 6x2TB drives in raid 5, CPU is a brand new i5 2400. I also tried putting sabnzbd in a VM (Hyper-V) with the same issue, and also tried using a different HDD as a temporary folder, and setting allow_64bit_tools to 0, with the same effect. I looked everywhere event logs and ran some of my own tests to try and figure out if this is hardware related, but so far I am coming up empty and thinking this problem is from sabnzbd, I came to the forum as a last resort, any help on this would be greatly appreciated.

Thank you in advance.

Version: 0.6.14
OS: Windows Server 2008 R2
Install-type: Windows Zip
Skin (if applicable): Plush
Firewall Software: SEP (Symantec Endpoint Protection, only virus app for server editions :-)
Are you using IPV6? No
Is the issue reproducible? yes

Re: Unpacking/Moving Performance Issue

Posted: January 20th, 2012, 10:30 am
by shypike
The basic problem with Windows is that it allows a single process to consume
all disk channel bandwidth.
unrar is almost fully disk-bound, it's easy to choke your hard disk with it.
As an experiment you could let WinRAR unpack a large archive and see whether that
triggers the same behaviour.

Re: Unpacking/Moving Performance Issue

Posted: February 6th, 2012, 8:29 am
by MoeenD
Just wanted to post an update on my progress, I think I determined the root cause, it was not sabnzbd related really, my raid 5 was set to Write-Through on the raid card I have, I set it to Write back and performance for reading and writing at the same time was a huge improvement! Thanks for replying and trying to help me with the issue :-)
Also as a side note I set the temp folder on another Raid 5 array I have and verify/repair/extract just got a lot better than the singular drive I had set to before.

Thanks again, I really appreciate the help.