Re: Will xfs_growfs succeed on a full file system?

["Geir A. Myrestrand" <geir.myrestrand@falconstor.com>]

Eric Sandeen wrote:
> Geir A. Myrestrand wrote:
>> Does xfs_growfs depend on some space left on the file system in order to 
>> be able to grow it?
>>
>> I have a colleague who ran into an issue where a file system resize 
>> failed. The file system is 100% full.
>>
>> Aside from analyzing what happened in his case, should XFS be able to 
>> grow a file system that is 100% full?
>>
>> The device has already been expanded, it is the XFS file system that 
>> fails to resize. I just wonder if that is by design, or whether it is an 
>> issue.
>>
> 
> Off the top of my head, I think it should work ok even if full, although
> I could be (and apparently I am) wrong here.  How exactly did the growfs
> fail?
> 
> I actually wasn't able to completely fill my filesystem, got stuck at
> 20k left.  :)  but growing that from 50M to 100M worked fine for me.
> 
> -Eric

The only error I saw in his output was this line:

xfs_growfs:
XFS_IOC_FSGROWFSDATA xfsctl failed: No space left on device

He claims that the file system is actually resized after it has been 
re-mounted. He verifies with df:

After expansion (with xfs_growfs):

# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/vbdi6               93504     93504         0 100% /nas/NASDisk-00006

# df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/vbdi6                64       6      58   10% /nas/NASDisk-00006

After re-mount:

# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/vbdi6              200000     93516    106484  47% /nas/NASDisk-00006

# df -i
Filesystem            Inodes   IUsed   IFree IUse% Mounted on
/dev/vbdi6            204800       6  204794    1% /nas/NASDisk-00006


-- 

Geir A. Myrestrand