Amahi Forums

Posted: **Thu Oct 14, 2010 4:19 pm**

Am I really this bad at math?

[root@localhost ~]# greyhole --stats

Greyhole Statistics
===================

Storage Pool
                                   Total -  Used =  Free + Attic = Possible
  /var/hda/files/drives/drive1/gh:  229G -   18G =  200G +    0G =  200G
  /var/hda/files/drives/drive2/gh:  917G -   10G =  860G +    0G =  860G

I feel so sure 917 minus 10 is 907...

Posted: **Thu Oct 14, 2010 6:06 pm**

Its the new math!

Hey it's just a few GB.

Posted: **Fri Oct 15, 2010 3:34 am**

benolding: If you try the same command now, does it work?
If not, the output of "df -k" would help.

Those numbers are taken from "df" commands.

Total and Used are from this command:

Code: Select all

df -k /var/hda/files/drives/drive2/gh | awk '{print $(NF-4),$(NF-3)}' | tail -1

which should show the 5th and 4th from last columns, which should be the total and used columns.

And the free is from this command, the result of which is cached and reused for 15 seconds before it's refreshed:

Code: Select all

df -k /var/hda/files/drives/drive2/gh  2>&1 | grep '%' | grep -v "^df: .*: No such file or directory$" | awk '{print $(NF),$(NF-2)}'

which should show the mount point, and the 3rd from last column (available).

Posted: **Fri Oct 15, 2010 8:06 am**

Still doesn't work:

Code: Select all

[root@localhost ~]# greyhole --stats

Greyhole Statistics
===================

Storage Pool
                                   Total -  Used =  Free + Attic = Possible
  /var/hda/files/drives/drive1/gh:  229G -   18G =  200G +    0G =  200G
  /var/hda/files/drives/drive2/gh:  917G -   32G =  838G +    0G =  838G

[root@localhost ~]# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1            117137748  57119240  54068252  52% /
tmpfs                   254832         0    254832   0% /dev/shm
/dev/sdb1            240364732  18627860 209526972   9% /var/hda/files/drives/drive1
/dev/sdc1            961432072  33409124 879184948   4% /var/hda/files/drives/drive2

Don't think it's a caching problem; nothing's going on on the system.

Posted: **Fri Oct 15, 2010 8:13 am**

Greyhole reports the correct values (the same as df).
Your problem is what df shows.

Maybe that partition has 5% reserved (for root) on it?

Code: Select all

tune2fs -l /dev/sdc1

Look for "Reserved block count".
5% would be expected for a partition that was formatted by a Linux installer when creating a partition to be used as the root of the OS (/). Maybe that drive was formatted that way, and you didn't touch it since, so it kept using 5%.

The -m parameter of tune2fs allows you to change that value to something smaller if you'd like. See "man tune2fs".
A typical value for data drive would be 1%.

Posted: **Fri Oct 15, 2010 8:48 am**

Wow - thanks! Didn't realize the reserved portion was in that little math equation, and you're right! I had the reserved set way too high.

Code: Select all

[root@localhost ~]# greyhole --stats

Greyhole Statistics
===================

Storage Pool
                                   Total -  Used =  Free + Attic = Possible
  /var/hda/files/drives/drive1/gh:  229G -   18G =  209G +    0G =  209G
  /var/hda/files/drives/drive2/gh:  917G -   32G =  876G +    0G =  876G

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