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help about create a big file and select right partition

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# 1  
Old 08-24-2012
help about create a big file and select right partition
I want create a 40G file one one disk if the disk free space is more than 45G

Code:
[root@localhost ~]# fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000c9518

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1306    10485760   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2            1306        2612    10487690+  83  Linux
Partition 2 does not end on cylinder boundary.
/dev/sda3            2612        3917    10485760   83  Linux
Partition 3 does not end on cylinder boundary.
/dev/sda4            3917       60801   456923798    5  Extended
/dev/sda5            3917       10444    52431164   83  Linux


Note some of them has been auto mounted

Code:
[root@localhost ~]# df 
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             10321208   6479336   3317584  67% /
tmpfs                 32958812       100  32958712   1% /dev/shm
/dev/sr0               3592530   3592530         0 100% /media/RHEL_6.3 x86_64 Disc 1
/dev/sda5             51608052   6378976  42607520  14% /mnt2

# 2  
Old 08-24-2012
u can get the location by

Code:
 
df -gt|awk 'NR>1&$4>45{print $NF}'

use this in your code as per ur convinience
# 3  
Old 08-24-2012
Quote:
Originally Posted by vidyadhar85
u can get the location by

Code:
 
df -gt|awk 'NR>1&$4>45{print $NF}'

use this in your code as per ur convinience

Code:
[root@localhost ~]# df -gt
df: invalid option -- 'g'
Try `df --help' for more information.

I'm on the redhat, and this only got the mounted disk size
# 4  
Old 08-24-2012
okies how about

Code:
df -k|awk 'NR>1{if(($4/1024/1024)>45){print $NF}}'

# 5  
Old 08-24-2012
Quote:
Originally Posted by vidyadhar85
okies how about

Code:
df -k|awk 'NR>1{if(($4/1024/1024)>45){print $NF}}'

It should be $3...

Code:
df -k|awk 'NR>1{if(($3/1024/1024)>45){print $NF}}'

# 6  
Old 08-24-2012
stat -f filesystem will give you some output like
Code:
stat -f /
  File: "/"
    ID: 1d07822b0456aa89 Namelen: 255     Type: ext2/ext3
Block size: 4096       Fundamental block size: 4096
Blocks: Total: 2491942    Free: 1349083    Available: 1224083
Inodes: Total: 625856     Free: 363409

# 7  
Old 08-24-2012
Quote:
Originally Posted by vidyadhar85
okies how about

Code:
df -k|awk 'NR>1{if(($4/1024/1024)>45){print $NF}}'


you also assume the disk has been mounted, but not all of them mounted

---------- Post updated at 12:25 AM ---------- Previous update was at 12:24 AM ----------

Quote:
Originally Posted by pamu
It should be $3...

Code:
df -k|awk 'NR>1{if(($3/1024/1024)>45){print $NF}}'


you also assume the disk has been mounted, but not all of them mounted
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