On Mittwoch, 5. Januar 2011 Lukas Czerner wrote: > If we > notice that we are running out of space in advance (how much in > advance?), we can start trimming smaller chunks, until we reach > reasonable a reasonable pool of reclaimed space, or until we trim > the whole device. Would it be possible that all blocks that have been in use since the last FITRIM run can be logged? Like this, we would only need to clean those. If you have a 2TB volume, probably only 25% of it have been rewritten (=500GB) since the last run, and of that maybe 80% are still in use at the time we run FITRIM, so only 100GB would need the cleanup. Maybe each AG could store a bitmap of written blocks, that are reset by a FITRIM run. That could be an asynchronous written bitmap and shouldn't disturb performance too much. Maybe it's even only needed to store a bit per sunit*swidth blocks, to keep that table small. A mount option could be used to enable that feature, so only those which use thin provisioning or SSDs or similar devices enable it at wish. Especially for 100TB size devices that seems like something that should be thought of, as maybe if you run FITRIM once a week there, only <10TB have been rewritten, if at all, and such a table would boost a FITRIM run a lot. But maybe this is just bullshit of my tired brain, and I'm not a dev so I have no idea how hard it would be to implement that. -- mit freundlichen Grüssen, Michael Monnerie, Ing. BSc it-management Internet Services: Protéger http://proteger.at [gesprochen: Prot-e-schee] Tel: +43 660 / 415 6531 // ****** Radiointerview zum Thema Spam ****** // http://www.it-podcast.at/archiv.html#podcast-100716 // // Haus zu verkaufen: http://zmi.at/langegg/
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