Comments on: NILFS – may be not yet

By: Kevin Burton

Kevin Burton — Thu, 13 Aug 2009 08:20:46 +0000

I seem to remember some caveats about the cleaner in NILFS…. like it wasn’t written yet or isn’t always scheduled.

There are some ‘hacks’ like this but I’m really just convinced that we need to start designing databases from the ground up to think like flash.

InnoDB is designed to think like HDDs.

If you want to get the full performance you need to think like flash. And I don’t mean SSD. I mean flash.

Even FusionIO is too high level I think…

There are just too many levels of indirection here now and I think they jut need to be removed.

Of course, I don’t have the time to write the system so I suspect it will take a few more years

By: Maxim

Maxim — Tue, 11 Aug 2009 00:00:48 +0000

Ah… Sorry, Vadim, sloppy me. Your result is an interesting one but kinda expected given the state of affairs with NILFS. I was wondering if you’ve done similar benchmarks with ext4, xfs. And whether the particular ssd brand is more “mysql/innodb friendly” given that each manufacturer implements own algorithms of ssd memory management.

By: Vadim

Vadim — Mon, 10 Aug 2009 23:23:31 +0000

Maxim

I mentioned that in post – Intel X25-E 32GB

By: Maxim

Maxim — Mon, 10 Aug 2009 22:33:54 +0000

Vadim, What SSDs (brand, type, etc.) and RAID type did you use for your tests?

By: Ufaria

Ufaria — Mon, 10 Aug 2009 15:20:18 +0000

Hello, i have a fusion-io card to make tests. is nilfs is not ready to use.. what fs is ready to use with ssd ?