[ZendTo] Re: Upload stalls on dropoff

Worthington, William w.j.worthington at herts.ac.uk
Fri Aug 1 13:03:35 BST 2014

Hi,  following up on both replies:

1) re: bandwidth – agreed. User's just don't realise the difference in speed, especially upload speed,  between their JANET connection at their desk and even a fast home connection (~10 x , > 20 x for most people)

I have a help page on our instance which give examples and advises that a multi-GB file is likely to timeout off JANET  https://www.exchangefile.herts.ac.uk/about.php#uploadtimes

2) re: disc capacity/ clamd    You might be able do a little bit of debug  -  ssh into your server and run

watch -d df –kh

Then start an upload.

Filesystem Size  Used Avail Use% Mounted on
/dev/sda1        18G  2.7G   14G  17% /
tmpfs           1.9G     0  1.9G   0% /dev/shm
/dev/sdb1 135G  544M  128G   1% /data
/dev/sdc1        39G  531M   36G   2% /var

In our system the temp upload folder is in /var  and the dropoff is in /data. So you can watch the bytes arrive into /var and then move into /data as the file is passes through clamd. This at least this would allow you to see at what stage it fails.

You would see if any of your partitions were full from this too.

I had a case where the browser thought it was still uploading but you could see the file system stop and dispose of the truncated file (it stopped doing anything). It turned out an OS upgrade brought in a php version with a bug that imposes a 2GB limit unless you set max_upload_size = 0.

Hope this helps.

best wishes,  Bill


Dr. W J Worthington
University of Hertfordshire

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