[TriLUG] SOLVED: Re: Failure Copying Large Amounts of Data

[boyle at laue.chem.ncsu.edu]

Hi Everyone,


On 16 Apr, boyle at laue.chem.ncsu.edu wrote:
> I have a problem copying > 90 GB of data between file systems.

Thanks for all the helpful feedback I received on this thread.  I
thought I would post the solution.  The problem was that my filesystem
was running out of inodes (the df -i command showed this).  After some
trial and error and some calculations of group size and inode size, I
decided to make my filesystem with the following mke2fs invocation:

mke2fs -c -m 1 -j -v -i 8192 -I 128 -T ext3 /dev/sdc1

I wanted to, as much as possible, emulate the filesystem parameters of
the partition I was backing up.  This is why I set the '-i' and '-I'
options on the command line.  These parameters gave me approximately 30
million inodes on 233GB partition.  In retrospect, given the size of
most of the files on this partition, the -i option could have been set
to 16384 (or 4 blocks, each block being 4096 bytes).  This, I think,
would have halved the number of inodes, but what the heck, I don't think
I'll run out of my 30 million inodes anytime soon.  

The information for various filesystem parameters can be had from the
dumpe2fs program, e.g. invoke as 

dumpe2fs /dev/sdc1

Again, thanks for the help.

Paul


-- 
Paul D. Boyle			    |	boyle at laue.chem.ncsu.edu
Director, X-ray Structural Facility |	phone: (919) 515-7362
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