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Old 08-17-2007, 07:38 PM   #1
bluethumb
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Question 2 TB quota limit on a RAID box?


Scientific Unix (clone of Red Hat Enterprise 5), x86_64
ext3 file system

I just set up a 6 TB RAID for a small group of users. There are some of them who will fill up all space available, so I decided to set quotas. I chose to make a hard quote of a little more than 2 TB, and I got a surprise. When I used edquota, it reduced the quota for a small number. After a bit of thought I realized that the number of disk blocks in 2 TB is the biggest number that will fit in a 32-bit unsigned integer. I cut the limit down to a little less than 2TB, and it seems to be happy.

Inquiring minds want to know:
Is this a general limit on ext3 file systems?
How would other file systems compare?
(Feel free to start a religious war about the various file systems; I'm curious.)
 
Old 08-17-2007, 08:11 PM   #2
cgjones
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Depending on the block size, there might be a limit of 2 TB. I don't think that is the issue though, seeing as how you already have a 6 TB partition.
 
Old 08-17-2007, 08:15 PM   #3
bluethumb
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Thanks. That clarifies my thinking. Probably the limit I hit is in the edquota program. I suppose I could write my own little program to set quotas using the quotactl() call. It appears to use 64-bit integers, according to the man page. Is there another way?

Last edited by bluethumb; 08-17-2007 at 08:22 PM. Reason: I learned about quotactl just after posting.
 
Old 08-17-2007, 08:38 PM   #4
cgjones
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How did you define the hard and soft limits, and what was the size difference between your quota and the reduced quota?
 
  


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