Date: Fri, 12 Sep 2014 09:19:03 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Shane Ambler" <FreeBSD@ShaneWare.Biz>, <freebsd-stable@freebsd.org> Subject: Re: Snapshots that won't delete [was: Re: ZFS on root booting...] Message-ID: <E13A5BF5177545C0B03F1617BBEA98D7@multiplay.co.uk> References: <FE64613E-B083-436C-8A08-13923ED88797@icloud.com> <7F008C560B48412AB66A1EBD9382DDAE@multiplay.co.uk> <CC276D59-F83C-4C78-BD9B-84040D3DE3E4@icloud.com> <9315C209-701A-49EF-85D3-ACCCD1513EC3@icloud.com> <959C54D2C8EB4AC8983DC1DA3CE042E3@multiplay.co.uk> <9F24DD48FBEA46C39F98DF600D46DA1A@multiplay.co.uk> <B4A16726-142D-458A-9B3A-153BDD579A63@icloud.com> <BAB9F50F-9D2C-435C-8035-659E2B412FC7@icloud.com> <4450778127F4407EB6566A0FE11CD651@multiplay.co.uk> <090135D4-8B1F-42B4-82FC-6FD2F1DBDDA8@icloud.com> <20140911071233.GA50585@anubis.morrow.me.uk> <541280D8.9090500@ShaneWare.Biz>
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Is there a hold on the snapshot? ----- Original Message ----- From: "Shane Ambler" <FreeBSD@ShaneWare.Biz> > On 11/09/2014 16:42, Ben Morrow wrote: >> Quoth Adam McDougall <mcdouga9@egr.msu.edu>: >>> >>> Were you running a newer kernel with an older format zpool? I heard >>> ixsystems had customers doing that and ran into corruption when they >>> tried to modify the zpool in some way (expand? I don't remember). >>> http://www.bsdnow.tv/episodes/2014_07_09-zfs_war_stories >> >> Oh! Might this be what's causing a problem I've been meaning to ask >> about? >> >> My desktop at home is running (a patched, but not anywhere to do with >> ZFS) 10-STABLE from a while ago, with a zpool that was created under >> 8.2-R and is still at version 15. I have been deliberately not upgrading >> it, because I saw no reason to and it seemed safer to leave things as >> they were. >> >> Recently, though, my dump script has started having occasional problems >> with snapshots that won't delete. Pending further investigation I have >> been renaming them to allow the recursive delete to succeed, and (so >> far) rebooting has always made it possible to get rid of them. > > I have seen that issue with 9.2 and at least one other person mentioned > it as well. I currently have a snapshot that I accessed at least 3 weeks > ago and renamed to keep rotations working and have not accessed since, > it still won't delete as it is busy. I can only delete these snapshots > after a reboot. > > The only cause I know is accessing the snapshot. > I can simply ls .zfs/snapshot/daily.01/somefolder to prevent it being > deleted. With a manual zfs destroy I get "dataset is busy" and have not > found a way to find any process that has hold of it. > > It seems that some aging of the snapshot needs to happen. Testing a > rotate, access, rotate keeps working ok, but access last nights > snapshot and then rotate and it blocks. > > I'm fairly sure that I was running 9.1 when I created this zpool and > then later upgraded to 9.2. zpool upgrade says "This system supports > ZFS pool feature flags" and "Pool 'zrpleader' already has all supported > features enabled". > > -- > FreeBSD - the place to B...Serving Data > > Shane Ambler > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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