Re: is xfs good if I have millions of files and thousands of hardlinks?

[Tomasz Chmielewski <mangoo@wpkg.org>]

Mark Goodwin schrieb:

> defragmenting by copying from the ext3 filesystem to a new filesystem
> should help, for a while at least. Whether xfs would have an on-going
> performance problem compared to ext3 depends on your usage patterns ..
> does "all the time" mean you are continuously adding new files and links
> and removing files at a high rate/second? Are multiple threads doing this?

Yes. Multiple threads adding new files (or hardlinks, if there are such 
files already) all the time (24h/day).
Normally, there is only one thread removing the files. Because of this 
performance problem I described, it also does its job 24h/day - it just 
can't finish removing the unneeded files in a couple of hours, not to 
say one day.


> Are all the files the same size? Block-size been tuned?

No, file sizes are mostly random stuff you will normally find on any 
rootfs, home, etc. directory.
It's a backup system which uses hardlinks so that files which are 
already in backup do not take additional place.

I didn't do any block-size tuning, as I don't really know where to bite.


-- 
Tomasz Chmielewski
http://wpkg.org