[OpenAFS] Not enough disk space
Mon, 10 Dec 2012 21:04:55 +0000
[ ... ]
>> most of our file servers exceed the magical limit of 2TiB per
>> partition. When I try to save a file via MS Word 2010 on a
>> volume there, an error is shown "There is not enough disk
>> space. Free enough disk space, and the try again." It seems
>> to be related to the free disk blocks on the partition
>> exceeding 2^31 . I'm not quite sure, if my users started
>> using MS Word for files on those partitions recently of if
>> the Windows AFS Client's behaviour changed during an upgrade.
> This has been discussed on the list before.
>>> For 1.6.1, ...
>>> commit a64864529d1fca2b5a3f4d21ec598982be335368
>>> Author: Jeffrey Altman <email@example.com>
>>> Date: Mon Apr 2 22:35:41 2012 -0400
>>> viced: AFSDisk, AFSFetchVolumeStatus Int31 PartSize
>>> The AFSDisk and AFSFetchVolumeStatus structures use signed
>>> 32-bit integers for representation partition size and
>>> available blocks. RoundInt64ToInt31() should be used instead
>>> of RoundInt64ToInt32() when assigning their values.
Please help me understand what this implies, as I am aware that
OpenAFS (or more generally I think AFS) volumes can be larger
than 2TiB,unless they are subject to quota (which are limited to
* Can OpenAFS partitions be larger than 2TiB? It seems they
* Are the limits above (31 bits) expressed in bytes or blocks
(of what size)?
* Does the bug fixed above affect the reporting of free space
or the handling of free space in partitions larger than
2TiB, or with more than 2TiB of free space?
* Does the bug affect only MS-Windows clients or GNU/Linux
Since there is conversion of 64 to 31 bits I guess that OpenAFS
accounts for space in 64 bit bytes/blocks but reports in 31 bit
Or put another way, what are the theoretical (in-the-protocol)
limits for "partition", "partition" free space, "volume"? And
what are the current implemented limits, disregarding the limits
of the underlying filesystem?
BTW as to volumes, looking at 'volsize-caution.pod' the version
with 1.6.1 says:
=ABCurrently, the maximum size of a volume is 2 terabytes (2^31
and more recent versions say:
=ABCurrently, the maximum quota for a volume is 2 terabytes
(2^41 bytes). Note that this only affects the volume's quota;
a volume may grow much larger if the volume quota is disabled.=BB
Was there a limit to volume size of 2TiB in 1.6.1 or was it
always just a quota size limit?