Date: Thu, 09 May 2019 08:45:28 +1000 From: Michelle Sullivan <michelle@sorbs.net> To: Karl Denninger <karl@denninger.net> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS... Message-ID: <EF8D7BE4-B904-42D4-9E38-CBC29908567C@sorbs.net> In-Reply-To: <4a3b65e1-f3a6-58cf-3de3-bdd11cf30b02@denninger.net> References: <30506b3d-64fb-b327-94ae-d9da522f3a48@sorbs.net> <5ED8BADE-7B2C-4B73-93BC-70739911C5E3@sorbs.net> <d0118f7e-7cfc-8bf1-308c-823bce088039@denninger.net> <2e4941bf-999a-7f16-f4fe-1a520f2187c0@sorbs.net> <20190430102024.E84286@mulder.mintsol.com> <41FA461B-40AE-4D34-B280-214B5C5868B5@punkt.de> <20190506080804.Y87441@mulder.mintsol.com> <08E46EBF-154F-4670-B411-482DCE6F395D@sorbs.net> <33D7EFC4-5C15-4FE0-970B-E6034EF80BEF@gromit.dlib.vt.edu> <A535026E-F9F6-4BBA-8287-87EFD02CF207@sorbs.net> <26B407D8-3EED-47CA-81F6-A706CF424567@gromit.dlib.vt.edu> <42ba468a-2f87-453c-0c54-32edc98e83b8@sorbs.net> <4A485B46-1C3F-4EE0-8193-ADEB88F322E8@gromit.dlib.vt.edu> <14ed4197-7af7-f049-2834-1ae6aa3b2ae3@sorbs.net> <453BCBAC-A992-4E7D-B2F8-959B5C33510E@gromit.dlib.vt.edu> <92330c95-7348-c5a2-9c13-f4cbc99bc649@sorbs.net> <d9086e22-fa73-1b01-d455-c32e0be70783@denninger.net> <CAOjFWZ4hb=Sixj4B6TScu6wWmcvXHs3_f7P38svwZKGP4ri3UQ@mail.gmail.com> <4a3b65e1-f3a6-58cf-3de3-bdd11cf30b02@denninger.net>
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Michelle Sullivan http://www.mhix.org/ Sent from my iPad > On 09 May 2019, at 03:04, Karl Denninger <karl@denninger.net> wrote: > >> On 5/8/2019 11:53, Freddie Cash wrote: >>> On Wed, May 8, 2019 at 9:31 AM Karl Denninger <karl@denninger.net> wrote: >>> >>> I have a system here with about the same amount of net storage on it as >>> you did. It runs scrubs regularly; none of them take more than 8 hours >>> on *any* of the pools. The SSD-based pool is of course *much* faster >>> but even the many-way RaidZ2 on spinning rust is an ~8 hour deal; it >>> kicks off automatically at 2:00 AM when the time comes but is complete >>> before noon. I run them on 14 day intervals. >>> >> .... (description elided) > > That is a /lot /bigger pool than either Michelle or I are describing. Not quite... My pool is 16*3T SATA (real spindles not SSD and no cache) =48T raw.. It is storage, remember write once or twice, read lots elsewhere in the thread? > > We're both in the ~20Tb of storage space area 20T +6T zvol was what was left on it whilst shuffling stuff around.. I had already moved off 8T of data.. the zvol is still fine and accessible. > . You're running 5-10x > that in usable space in some of these pools and yet seeing ~2 day scrub > times on a couple of them (that is, the organization looks pretty > reasonable given the size and so is the scrub time), one that's ~5 days > and likely has some issues with parallelism and fragmentation, and then, > well, two awfuls which are both dedup-enabled. > > -- > Karl Denninger > karl@denninger.net <mailto:karl@denninger.net> > /The Market Ticker/ > /[S/MIME encrypted email preferred]/
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