Mailinglist Archive: opensuse (1239 mails)

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Re: [opensuse] Re: XFS and openSUSE 12.1
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On 2013-06-13 01:09, Anton Aylward wrote:

If and only if both a) you have this data on a separate file system
from the 'system', and b) each file system can have its won cache
then setting the cache(data) size to zero for the file system where
you are storing the images will achieve what you want.

I don't think a zero (write) cache is appropriate either. He needs a
cache in case the system is doing something else at the moment, so
that it can delay the actual writing for some seconds.

Normally the cache would be used all for this application, it writes
so much. So being able to separate an appropriate cache for this
application or this filesystem (whatever is feasible, if any) would be
best. Say 2..4 GB for this, the rest for the system.

Is this possible?


But if you can't use separate caches then shrinking the cache to
zero will hurt other parts of the performance.

Right. And his real work system has more tasks to do.


I think being aggressive about page ageing and flushing aged pages
is the best approach in that case.

Other tasks will be affected.

Linda idea of using "posix_fadvise" and opening the file for write
only seems to me a very good one. But she also said "the calls are
advisory".


- --
Cheers / Saludos,

Carlos E. R.
(from 12.3 x86_64 "Dartmouth" at Telcontar)
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