Date: Mon, 10 Aug 2015 19:46:37 +1000 From: Da Rock <freebsd-fs@herveybayaustralia.com.au> To: Willem Jan Withagen <wjw@digiware.nl>, freebsd-fs@freebsd.org Subject: Re: Urgently need some help solving lost space due to snapshots during receive op Message-ID: <55C872FD.1060608@herveybayaustralia.com.au> In-Reply-To: <55C863DE.3000200@digiware.nl> References: <55C82BCD.2050404@herveybayaustralia.com.au> <55C863DE.3000200@digiware.nl>
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On 10/08/2015 18:42, Willem Jan Withagen wrote: > On 10-8-2015 06:42, Da Rock wrote: >> I'm trying to move a pool from one system to another - exact same hdd >> and config, different in other areas. Both register same space >> available, and so should be no issue. The old system is quite full - >> still at least 5% free though. > Hi, > > Are the versions of your FreeBSD also equal? No. 9.1 to 10.1. > > Because in newer version, the free space reservation is significantly > bigger. So if disks are equal size, then with newer FreeBSDs you have > less usable space available. > Don't know the exact SVN commit where it happened. But there are more > question on this topic in the list, and they all boil down to the same > thing: ZFS needs more reserved space to be able to do certain things > without freezing the system. > > I've not read any suggestions that you can circumvent this setting. Crap. So I guess my best will be to compress as best I can for the moment or something like that. > > As a second note I think is is more or less general understanding that a > ZFS systeem needs a lot more space left free than 5% to actual be able > to perform. > Last number I remember as sensible maximum fill level is around 70%. > If you go over it, your system is going to be busy with ZFS bookkeeping > instead of data storage. Yeah, I noticed that. Something I'm working on... backlog of sorting activities really :) Once I'm done it'll drop to well below 50% I'd say. > (One of the things I remember from the ZFS lecture by Kirk McKusik, > which I no longer can find on YouTube :( ) > > --WjW Thanks for the info - I owe you a beer! At least I know why now and eases my growing headache from banging my head on the brick wall. > >> I have done a recursive snapshot on the system and a send/receive over >> ssh. Near the end, it final croaks and says no space left. The snapshot >> it is sending is nowhere to be found on the receiving system. >> >> Ok, checked free space - should be enough - so I try a simple cp op on >> the last dataset, but then it again croaks no space near the end, but at >> least I have some data. >> >> Checking space again, it says free space of an expected value, but still >> won't allow further data. >> >> I can't seem to figure out why this is not working, I'm currently trying >> using compression on the dataset to see if it can't squeeze it on there, >> but I still have a couple of no space messages so far. >> >> Where has my space gone?! >> >> TIA >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"
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