Incorrect free space

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deejay01
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Incorrect free space

Post by deejay01 » June 19th, 2017, 1:16 am

I have sabnzbd version 2.1.0 running on a raspberry pi. Downloads automatically pause when the size is greater than the free space, which is fair enough, but a problem arises when the calculated free space doesn't match the actual free space. sabnzbd is saying that I have 700MB free space whereas the actual figure is about 60GB. So the question becomes how does it calculate its free space value?

Thanks in advance...

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safihre
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Re: Incorrect free space

Post by safihre » June 19th, 2017, 1:43 am

It does a basic request to the system service statvfs.
What is the output when you run that command on the command line?

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Re: Incorrect free space

Post by deejay01 » June 19th, 2017, 3:24 am

Does this help?

Code: Select all

#!/usr/bin/python
import os
print os.statvfs("/media/pi/SANDISK128");

posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=1278529L, f_bfree=247545L, f_bavail=176838L, f_files=333248L, f_ffree=203806L, f_favail=203806L, f_flag=1024, f_namemax=55)

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Re: Incorrect free space

Post by safihre » June 19th, 2017, 5:23 am

We use f_bavail*f_bsize, where f_bavail=available blocks to the user and f_bsize=block size.
If I do that calculation on the data you provided it comes to 687MB. So maybe it's a permission issue?

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.maxx
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Re: Incorrect free space

Post by .maxx » June 26th, 2017, 10:31 am

Same problem here.
  • The 'complete' folder is on my NAS which has 4,xTB of free Space.
  • My Mac shows me 4,xTB of free space.
  • SAB 2.1.0 shows me 196GB of free space.
I've changed the folder to an other one, but still the same.
The permission in SAB is at 777.

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safihre
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Re: Incorrect free space

Post by safihre » June 26th, 2017, 11:14 am

Unfortunately, nothing we can do. This is what the OS is reporting to us. Maybe it's some permissions issue or some other network related problem that it's getting wrong information.
We just don't have another way to read it than using the system functions..

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Re: Incorrect free space

Post by safihre » June 26th, 2017, 11:16 am

Maybe you can also run on the command line the same commands in python as above, and post what it outputs? (but with the path to your NAS of course)
Maybe we can diagnose!

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.maxx
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Re: Incorrect free space

Post by .maxx » June 27th, 2017, 3:21 am

Sorry but I don't know how to use the statvfs command on macOS.

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sander
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Re: Incorrect free space

Post by sander » June 27th, 2017, 3:35 am

.maxx wrote:
June 27th, 2017, 3:21 am
Sorry but I don't know how to use the statvfs command on macOS.
Do you know how to open a terminal / command prompt, and run python?

If so, run this, and post the output here

Code: Select all

python -c "import os; print os.statvfs('/home/me/');"
Example from my Linux:

Code: Select all

$ python -c "import os; print os.statvfs('/home/sander/');"
posix.statvfs_result(f_bsize=4096, f_frsize=4096, f_blocks=3916268L, f_bfree=509852L, f_bavail=305155L, f_files=1003680L, f_ffree=564690L, f_favail=564690L, f_flag=4096, f_namemax=255)

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.maxx
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Re: Incorrect free space

Post by .maxx » June 27th, 2017, 3:45 am

Do you know how to open a terminal / command prompt, and run python?

If so, run this, and post the output here

Code: Select all

python -c "import os; print os.statvfs('/home/me/');"
Thanks got it:

Code: Select all

posix.statvfs_result(f_bsize=1048576, f_frsize=1024, f_blocks=2332848292, f_bfree=153868548, f_bavail=153868548, f_files=2332848290, f_ffree=153868548, f_favail=153868548, f_flag=2, f_namemax=255)

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sander
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Re: Incorrect free space

Post by sander » June 27th, 2017, 5:00 am

Code: Select all

posix.statvfs_result(
f_bsize=1048576, 
f_frsize=1024, 
f_blocks=2332848292, 
f_bfree=153868548, 
f_bavail=153868548, 
f_files=2332848290, 
f_ffree=153868548, 
f_favail=153868548, 
f_flag=2, 
f_namemax=255)
OK, good: no negative or strange values reported.

Can you also post the disk path you used in your command?

This is how sabnzbd calcutates:

Code: Select all

                s = os.statvfs(_dir)
                if s.f_blocks < 0:
                    disk_size = float(sys.maxint) * float(s.f_frsize)
                else:
                    disk_size = float(s.f_blocks) * float(s.f_frsize)
                if s.f_bavail < 0:
                    available = float(sys.maxint) * float(s.f_frsize)
                else:
                    available = float(s.f_bavail) * float(s.f_frsize)
                return disk_size / GIGI, available / GIGI
So
disk_size = float(s.f_blocks) * float(s.f_frsize) = 2332848292 * 1024 = 2224 GigiB

available = float(s.f_bavail) * float(s.f_frsize) = 153868548 * 1024 = 146 GigiB

Hmmm ... does that match what you reported what SAB was telling? Was the python run against the NAS path?

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.maxx
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Re: Incorrect free space

Post by .maxx » June 27th, 2017, 5:16 am

Hi sander,

I used that command:

Code: Select all

python -c "import os; print os.statvfs('/Volumes/Medien/');"
The macOS Finder (10.12.5) tells me that my Synology NAS got:
  • 28,78TB of capacity
  • 4,65TB of free space
  • I mount it correctly via SMB and it shows up in /Volumes
  • I restarted the NAS and my Mac several times
  • I did a fresh SAB install
  • SAB still tells me that I now only got 235,5GB (deleted some today)

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sander
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Re: Incorrect free space

Post by sander » June 27th, 2017, 5:22 am

Strange.

What is the output of:

Code: Select all

df -h

Code: Select all

dh -h /Volumes/Medien/

Code: Select all

df -h /Users

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.maxx
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Re: Incorrect free space

Post by .maxx » June 27th, 2017, 5:26 am

df -h

Code: Select all

Filesystem                      Size   Used  Avail Capacity     iused      ifree %iused  Mounted on
/dev/disk0s2                   465Gi   40Gi  425Gi     9%     1289380 4293677899    0%   /
devfs                          180Ki  180Ki    0Bi   100%         626          0  100%   /dev
map -hosts                       0Bi    0Bi    0Bi   100%           0          0  100%   /net
map auto_home                    0Bi    0Bi    0Bi   100%           0          0  100%   /home
//[email protected]/Medien      26Ti   22Ti  4.2Ti    84% 23560704746 4541947320   84%   /Volumes/Medien
//[email protected]/Dokumente   26Ti   22Ti  4.2Ti    84% 23560704746 4541947320   84%   /Volumes/Dokumente
df -h /Volumes/Medien/

Code: Select all

Filesystem                   Size   Used  Avail Capacity     iused      ifree %iused  Mounted on
//[email protected]/Medien   26Ti   22Ti  4.2Ti    84% 23560704746 4541947320   84%   /Volumes/Medien
df -h /Users

Code: Select all

Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk0s2  465Gi   40Gi  425Gi     9% 1289383 4293677896    0%   /

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sander
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Re: Incorrect free space

Post by sander » June 27th, 2017, 7:20 am

Aha. We don't understand what is going on ... is statvfs() wrong (it is depcreceated, after all)? Are we calculating wrong? Is your disk size too big for statvfs()? Do you have quota enabled?

So we have to think about this. The problem is we can't reproduce it.

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