[Ocfs2-users] Defragmenting OCFS2

[Adurotec]

On 08/30/2011 10:34 AM, Werner Flamme wrote:
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> David [30.08.2011 17:18]:
>> Ran into an issue last week were a 150GB OCFS2 partition would not allow
>> any further data to be written to it.  The issue was first discovered as
>> a result of a PHP web app alarming that it couldn't write files to
>> disk.  When the issue was investigated initial indications showed; via
>> `df -h`, that the partition still had 56GB of space left.  When an an
>> attempt to create a random file using dd was performed it ran into the
>> same issue.
> Does `df -i` state that there are enough inodes free too? When the
> Volume was created with big clusters, any file will occupy at least one
> cluster, even if it is only 5 bytes in size.
>
> tunefs.ocfs -Q "%B %T\n" /dev/$yours
> should output the same number twice if many small files are stored on
> the volume (man tunefs.ocfs). They will differ when you used an option
> like "-T datafiles" when creating the filesystem (man mkfs.ocfs2).
>
> Regards,
> Werner
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I should have mentioned that in my original email, there were/are still 
1.8M inodes available on this volume.
tunefs.ocfs2 -Q "%B %T\n" /dev/sdb didn't result in the same number 
twice, instead it was 4096 32768 which
fits with what was specified during fs creation:

mkfs.ocfs2 -b 4k -C 32K /dev/sdb

Obviously didn't specify the -T which in reading the man page would 
suggest that we need to use the "mail" type
since we are writing small files and not large ones as indicated by 
datafiles option.

David

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