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Please explain how to read df -k

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Special Forums Hardware Filesystems, Disks and Memory Please explain how to read df -k
# 1  
Old 06-09-2010
Please explain how to read df -k
What I'm trying to find out is how many gb do we actually have free, how do you calculate that with the following output from the df -k command.

Code:
Filesystem    1024-blocks      Free     %Used  Iused      %Iused    Mounted on
/dev/prod001     46137344      9200468   81%    26166     1%        /usr/prod001

# 2  
Old 06-09-2010
Why don't you use df -h instead?
Last edited by dr.house; 06-09-2010 at 11:56 AM.. Reason: Crap removed (to avoid confusion)
# 3  
Old 06-09-2010
Hi.

Looks like you 8.77 GB free (9200468 / 1024 / 1024) from 44 GB (46137344 KB)
# 4  
Old 06-09-2010
Like so?
Code:
df -k /dev/prod001 | awk 'NR>1 {print $2/1024/1024}'

# 5  
Old 06-09-2010
Quote:
Originally Posted by pseudocoder
Like so?
Code:
df -k /dev/prod001 | awk 'NR>1 {print $2/1024/1024}'

$3, but yes, like that Smilie
# 6  
Old 06-09-2010
Thanks alot, so can someone explain to me why a senior admin once told me that roughly adding 2 million units = 1 gb, and that is the number I should add to the units field to add space. Also how do I add more to the original number of 44gb or add space to the overall size? I guess what I'm asking is what is my limit, where do I see that?

Code:
         Change / Show Characteristics of a Journaled File System

Type or select values in entry fields.
Press Enter AFTER making all desired changes.
  
[TOP]                                                   [Entry Fields]        
  File system name                                    /usr/prod001            
  NEW mount point                                    [/usr/prod001]           
  SIZE of file system
          Unit Size                                   512bytes               +
          Number of units                            [92274688]               #
  Mount GROUP                                        []
  Mount AUTOMATICALLY at system restart?              yes                    +
  PERMISSIONS                                         read/write             +
  Mount OPTIONS                                      []                      +
  Start Disk Accounting?                              no                     +
  Fragment Size (bytes)                               4096                    
  Number of bytes per inode                           4096                    
  Compression algorithm                               no

# 7  
Old 06-15-2010
Hi.

Adding 2 million units would be approx. 1 GB because each unit it 512 bytes (0.5K).

Code:
> bc
scale=3
2000000*0.5               # 2 Million x 0.5 (i.e. divided by 2)
1000000.0                 # 1 Million KB
1000000 / 1024 ^ 2        #
.953                      # 0.953 GB

To add more space to the filesystem, first check if you have any free partitions in the VG and use chfs (and chlv if required) to grow the filesystem, otherwise a) shrink other filesystems in the VG to create free space; or extend the VG with another LUN.
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