file system size limits
Hi,
I need to know if 18TB file system is possible in RHEL 5.5 I know that ext3 file system size limit is 16TB and LVM decide can go upto 8EB but if i create LVM of 18TB, i still have to create ext3 file system on it which is limited to 16TB am i missing something ? also, what are the disadvantages of creating such as large file system? is chkdsk type facility going to take forever? |
According to Red Hat, you would be looking at XFS or GFS2 to get 18TB.
LVM is your disk partition, ext3 is your filesystem. Compare LVM to adding a 18TB HDD and/or SAN LUN and then needing to put a filesystem on it to actually use it. Unless of course whatever application has it's own proprietary filesystem and can handle direct I/O (like oracle ASM). in terms of disadvantages, it depends on what you are putting on there. A single large DB on an 18TB LUN shouldn't cause any problems. An 18TB LUN full of tiny files will create a big headache. As for chkdsk, you could really say any application/tool that needs to access many of the blocks will take forever. It is a function of your disk speed. Don't forget to consider how you will back it up too. |
Ask yourself if you really NEED 18TB in a single volume, would you be better served having smaller volumes on different mount points?
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