Date: Wed, 14 Sep 2016 22:48:29 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: [ZFS] refquota is very slow ! Message-ID: <F0B1160A-B311-4510-8105-915118F6EFF6@gmail.com> In-Reply-To: <57CFE031.90308@quip.cz> References: <D559DE69-A535-427C-A401-1458C2AA8C31@gmail.com> <1472914773423.63807@kuleuven.be> <0E828163-AEAB-4C8C-BFCF-93D42B3DB3B6@gmail.com> <1524067530.1937.a66cb17f-9141-4bef-b758-5bb129d16681.open-xchange@ox.internetx.com> <EDDE17FC-1B3A-4912-B93C-08E18433A4C9@gmail.com> <f5969fc9-44e2-a8a0-1a7f-9475e65ab93a@internetx.com> <67B3E11E-22B7-4719-A7AF-B8479D35A6D2@gmail.com> <7df8b5ce-d9ae-5b05-0aa5-1de6b06fd29e@internetx.com> <5E3B106D-99CB-4F25-A363-6419C32FBF57@gmail.com> <57CFE031.90308@quip.cz>
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> On 07 Sep 2016, at 11:38, Miroslav Lachman <000.fbsd@quip.cz> wrote: >=20 > Ben RUBSON wrote on 09/07/2016 10:44: >>=20 >> OK ! >> Well, Juergen you put me on the right way. >> I investigated further and further and found that refquota slowness = is not due to the number of files but to the remaining free space. >> Let me explain this. >=20 > I don't have a bookmark so I can't send you a direct link but it was = mentioned before. refquota is similar to full pool in this case, so if = you are close to or over 80% full, you will notice this slowdown. > You can try to search the web for details. I found this interesting post from Matthew Ahrens : http://marc.info/?l=3Dfreebsd-fs&m=3D137184901423584 However it does not explain the (huge) performance difference between = quota and refquota. I did not found many more interesting things. > On 03 Sep 2016, at 16:59, Bram Vandoren <bram.vandoren@kuleuven.be> = wrote: >=20 > I think the userquota property works without any problem though. Yes you're right, Matthew Ahrens also indicates that userquota should = not impact performance : = http://www.archivum.info/zfs-discuss@opensolaris.org/2010-08/00218/Re-(zfs= -discuss)-ZFS-Group-Quotas.html (which I also tested and can confirm) Ben
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