Date: Thu, 04 Dec 2014 14:47:40 -0800 From: Xin Li <delphij@delphij.net> To: Steven Hartland <killing@multiplay.co.uk>, freebsd-fs@freebsd.org Subject: Re: ASHIFT=13 by default. Message-ID: <5480E48C.6040801@delphij.net> In-Reply-To: <5480C336.8020901@multiplay.co.uk> References: <CACpH0Mc%2Bs9xwjNyrAPCh3%2BzxSAgr396h7jJGWxah7Zhx4CFyRg@mail.gmail.com> <5480C336.8020901@multiplay.co.uk>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 12/04/14 12:25, Steven Hartland 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. It is: 8k is the default zvol blocksize. BTW. Why bother to create zpools over zvols? Wouldn't it mean double checksumming? Cheers, > 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" - -- Xin LI <delphij@delphij.net> https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.0 (FreeBSD) iQIcBAEBCgAGBQJUgOSJAAoJEJW2GBstM+nsCyQP/12VpHMjMvDTDKzvJW2XeE5/ K4tF6YU8fP6/5MD+YIongCKeUBd9lkRaRH0WU0jdIwH60OlQMniJAngd+4ENw9Bn VBj3QWI7SmU0EQ5xJbxx6P68JjmA0ySZx2cq6qrAZSiE/yNkKfvFphYRNKAuHcdn m9CJBzP+THlVPCioeD++MF3AaQ8jSHQ59HRY2qU49vnrqc5HdNWRo79coh+tYlld xMNGSj9y4/r5LFjI2bUqKBqg5XoAdx6678WtDVq43i7FXTa0OUk/IEHhJDCuJuQ7 kIutG2Dz43ElezoLFSUTqlhR0rotHaHVZEWLb6pz01bb0FOgWP4YAHEaOIoLA2bT GOTjY6T4Y0drc0FBiIGpvNXSweEWxA259h9prr8JIjMnd/kiq3HyznoIxr2HYoPv Hznnli3aBl3I4SKyGOXfxV6qyv7RGIht7jjS94clLl+YcWiIWy68wEV351/yyRb9 ylx5zwqLkoW26r4Z+M0edZRtlsoVaRCvoekaQXYENqEsydfQcr4Xjng5ww20t/F5 aXTWa8mXmiPhSGxWaVNh5qY71yPIsPWhIHda0e4Kyo7N0/xBJUTuOHSN1vwInDgk 1ksulExXvIizR53zotzhLDm3wa0H5kxNav9A8KHoZJEtu//dbWb4JMnOn6UvqDfx 3E6GAv+bWgIRuYjtNgue =xpV9 -----END PGP SIGNATURE-----
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