Date: Fri, 6 Dec 2013 13:46:56 +0100 (CET) From: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> To: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Does FreeBSD's ZFS reserve 1/64 of the capacity for COW? Message-ID: <alpine.BSF.2.00.1312061325420.75198@mail.fig.ol.no>
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Hi, Today I came across "Becoming a ZFS Ninja Part 1" http://www.youtube.com/watch?v=tPsV_8k-aVU featuring Ben Rockwood who stated that ZFS reserves 1/64 of the capacity for COW safe-guarding. Fast forward to 00:49:44. Thus, one should take this fact into account when planning the storage capacity of your (larger) zpools. Does FreeBSD's ZFS also reserve 1/64 of the capacity for COW? If it's true, then I guess this should be noted in zpool(8) and in the Handbook. Any comments or insights? Do you think I should file a PR? Have a nice weekend! ;-) -- +-------------------------------+------------------------------------+ | Vennlig hilsen, | Best regards, | | Trond Endrestøl, | Trond Endrestøl, | | IT-ansvarlig, | System administrator, | | Fagskolen Innlandet, | Gjøvik Technical College, Norway, | | tlf. mob. 952 62 567, | Cellular...: +47 952 62 567, | | sentralbord 61 14 54 00. | Switchboard: +47 61 14 54 00. | +-------------------------------+------------------------------------+
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