Difference between revisions of "Quota"

From UMIACS
Jump to navigation Jump to search
(Per DOCS-839, added nfshomes to the list of fluidfs mounted home directories. Moved 'Tree Quotas' to the bottom and updated phrasing accordingly.)
Line 1: Line 1:
==Tree Quotas==
 
The current most prevalent style of quota management is done through tree quotas that show up in how much space is available in the file system by using the '''<tt>df</tt>''' command to inspect either the current path (no arguments given) or a given path.  [[NFShomes]] and many other file systems utilize this style of quota management.
 
 
For example to show my /nfshomes/derektest home directory quota i can just use '''<tt>df ~</tt>'''
 
<pre>
 
$ df ~
 
Filesystem          1K-blocks      Used Available Use% Mounted on
 
umiacsfs02:/nfshomes/derektest
 
                      1024000    49984    974016  5% /nfshomes/derektest
 
</pre>
 
 
 
==RPC Quotas==
 
==RPC Quotas==
Alternatively we now have some file systems that support RPC quotad quotas.  These are reported to the user by the '''<tt>quota</tt>''' command.  Home directories that are mounted from our Dell FluidFS NAS will support these kinds of quotas (/cliphomes, /cfarhomes, /cbcbhomes).
+
File systems that support RPC quotad quotas are reported to the user by the '''<tt>quota</tt>''' command.  Home directories that are mounted from our Dell FluidFS NAS will support these kinds of quotas (/cliphomes, /cfarhomes, /cbcbhomes, /nfshomes).
  
 
To find out what your current quota is, first run '''<tt>df .</tt>''' to find out what file system you are currently mounted from (in this example it is  <tt>fluidfs:/rama_cfarhomes/derek</tt>). '''Please note that the Use% here is for the entire file system and not your user-specific home directory.'''
 
To find out what your current quota is, first run '''<tt>df .</tt>''' to find out what file system you are currently mounted from (in this example it is  <tt>fluidfs:/rama_cfarhomes/derek</tt>). '''Please note that the Use% here is for the entire file system and not your user-specific home directory.'''
Line 32: Line 21:
  
 
If you have hit your RPC quota and haven't realized it, you may see some strange issues. For example, you will not be able to write-out files (although 'touch' and file concatenation will succeed). Some applications such as vi will throw "FSync" errors. Similarly, commands such as wget will appear to succeed but your files will be zero-length.
 
If you have hit your RPC quota and haven't realized it, you may see some strange issues. For example, you will not be able to write-out files (although 'touch' and file concatenation will succeed). Some applications such as vi will throw "FSync" errors. Similarly, commands such as wget will appear to succeed but your files will be zero-length.
 +
 +
==Tree Quotas==
 +
An alternate style of quota management is done through tree quotas that show up in how much space is available in the file system by using the '''<tt>df</tt>''' command to inspect either the current path (no arguments given) or a given path.
 +
 +
For example to show my /nfshomes/derektest home directory quota i can just use '''<tt>df ~</tt>'''
 +
<pre>
 +
$ df ~
 +
Filesystem          1K-blocks      Used Available Use% Mounted on
 +
umiacsfs02:/nfshomes/derektest
 +
                      1024000    49984    974016  5% /nfshomes/derektest
 +
</pre>

Revision as of 21:41, 8 August 2019

RPC Quotas

File systems that support RPC quotad quotas are reported to the user by the quota command. Home directories that are mounted from our Dell FluidFS NAS will support these kinds of quotas (/cliphomes, /cfarhomes, /cbcbhomes, /nfshomes).

To find out what your current quota is, first run df . to find out what file system you are currently mounted from (in this example it is fluidfs:/rama_cfarhomes/derek). Please note that the Use% here is for the entire file system and not your user-specific home directory.

# df .
Filesystem           1K-blocks      Used Available Use% Mounted on
fluidfs:/rama_cfarhomes/derek
                     1073741824 759351008 314390816  71% /cfarhomes/derek

Then run quota and that line will list your quota information for that file system. If you see errors such as "Error while getting quota from ..." you may safely ignore these as some of our file systems such as Gluster do not report quotas correctly.

$ quota
Disk quotas for user derek (uid 2174): 
     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
fluidfs:/rama_cfarhomes/derek
                 337560       0 10240000               0       0       0

If you have hit your RPC quota and haven't realized it, you may see some strange issues. For example, you will not be able to write-out files (although 'touch' and file concatenation will succeed). Some applications such as vi will throw "FSync" errors. Similarly, commands such as wget will appear to succeed but your files will be zero-length.

Tree Quotas

An alternate style of quota management is done through tree quotas that show up in how much space is available in the file system by using the df command to inspect either the current path (no arguments given) or a given path.

For example to show my /nfshomes/derektest home directory quota i can just use df ~

$ df ~
Filesystem           1K-blocks      Used Available Use% Mounted on
umiacsfs02:/nfshomes/derektest
                       1024000     49984    974016   5% /nfshomes/derektest