On Mon, Apr 29, 2013 at 08:33:42AM +0000, James Harper wrote:
> When loading the data into postgresql absolutely crawled along (~50kb/second
> disk write speed with 100% iowait) I knew I had a problem.
> Something, somewhere has changed in my system that absolutely kills tiny sync
> writes. Or alternatively, something has changed in my system that makes mysql
> do tiny sync writes.
What do you expect from sync writes regarding bacula?
I don't use sync writes there as I am very sure they won't give me a
benefit. As soon as the DB-server dies, the job is failed, you can't add
the remaining attributes in a reasonable way later and sd/dir both
refuse to work without a database server.
I suggest turning sync writes off.
This is valid for bacula, not for some random other database
application.
> I'm working on trying to track down wtf is going on there, but in the
> meantime I have set innodb_flush_log_at_trx_commit=0 which means it won't run
> an fsync after each tiny little write but will instead wait for around a
> second then flush everything. This means I stand to lose 1 second of database
> commit in the event of a crash, but I also probably lose the whole backup job
> anyway so I don't see it as a loss.
Exactly.
Regards,
Adrian
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