On 2011-01-14 at 11:43, Lewis, Dave ( [email protected] ) said:
Hi,
I'm wondering what is a reasonable size for large AFS volumes. I
understand that the maximum size of a volume is about 2 TB (assuming
that the partition is at least that size). From a practical standpoint,
is it reasonable to have a 2 TB volume? Should I expect any problems
doing operations like bos salvage or vos move on large volumes?
We've been running with some data volumes in the TB range for a while now
without problems. Biggest volume right now is ~3.2TB. Splitting these
large volumes isn't very practical.
vos move will seem to take forever, but we've moved TB scale volumes
without any problems.
You'll find, however, that around 2TB, some tools will start to report
negative numbers for volume size, and you can't set a quotas bigger than
2TB, so you get to set the quota to 0, disabling it entirely.
For example, I'm wondering if bos salvage has a "harder" time with a few
large volumes than with several smaller volumes. I figure that, with
smaller volumes, internal inconsistencies that bos salvage fixes would
be more isolated than with large volumes, and that that would be
beneficial. But I don't really know.
salvages will take longer certainly, but it hasn't had any problems in my
experience.
Currently we mount 25 GB volumes in users' home directories for their
image data, which grows a lot during data processing. Some users are
starting to feel limited by 25 GB volumes, so I'm considering going to
100 GB volumes. I would appreciate any advice. Should large volumes be
salvaged more often than small volumes?
Gee, how big are their homedirs then ;) Ours start out with a 50GB quota,
with some hovering somewhere between 100-200GB.
Our rule for allocating space is, don't give them too much right away, or
they'll use it up in no time. When most people hit their quota, they
naturally find ways to work within their quota without having to ask for
more space ;)
--andy
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