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From Apache Wiki <wikidi...@apache.org>
Subject [Cassandra Wiki] Update of "CassandraHardware" by JonathanEllis
Date Tue, 23 Feb 2010 13:52:24 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for change notification.

The "CassandraHardware" page has been changed by JonathanEllis.
The comment on this change is: mention file system limits.
http://wiki.apache.org/cassandra/CassandraHardware?action=diff&rev1=7&rev2=8

--------------------------------------------------

  
  As covered in [[MemtableSSTable]], compactions can require up to 100% of your in-use space
temporarily in the worst case, free on a single volume (that is, in a data file directory).
 So if you are going to be approaching 50% or more of your disks' capacity, you should raid0
your data directory volumes.
  
+ On ext2/ext3 the maximum file size is 2TB, even on a 64 bit kernel.  On ext4 that goes up
to 16TB.  Since Cassandra can use almost half your disk space on a single file, if you are
raiding large disks together you may want to use xfs instead (16TB max on a 32 bit kernel,
basically unlimited on 64 bit).
+ 

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