Date: Thu, 4 Dec 2014 19:16:10 -0500 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: Steven Hartland <killing@multiplay.co.uk> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ASHIFT=13 by default. Message-ID: <CACpH0MergALpgxc82PtxJ2h_Ud8wexwpJwYA_MiOs1wuir0f6w@mail.gmail.com> In-Reply-To: <5480C336.8020901@multiplay.co.uk> References: <CACpH0Mc%2Bs9xwjNyrAPCh3%2BzxSAgr396h7jJGWxah7Zhx4CFyRg@mail.gmail.com> <5480C336.8020901@multiplay.co.uk>
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Well in this case the "space" was a file created with zfs create -V 10g On Thu, Dec 4, 2014 at 3:25 PM, Steven Hartland <killing@multiplay.co.uk> wrote: > If thats the case the underlying storage will be reporting a logical block > size of 8k. > > Assuming that's the case then this is expected / correct behavior. > > > On 04/12/2014 19:05, Zaphod Beeblebrox wrote: > >> So... I think I answered at least a small part of my confusion with the >> test ZFS datasets. I created them with 'zpool create vrx raidz >> /dev/zvol/*' ... and it would appear that the default behavior for this is >> to assign ASHIFT to be 13 ... which makes these test pools rater >> unrepresentative of ordinary zfs pools. >> >> That means that many people using test ZFS pools are testing with 8k >> blocks >> (not even just 4k blocks). While I can immediately understand what I need >> to do to get a representative test, I'm posting because other people may >> have been similarly confused. >> _______________________________________________ >> 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" >> > > _______________________________________________ > 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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