Date: Thu, 24 Jan 2013 16:37:07 +0100 From: Adam Nowacki <nowakpl@platinum.linux.pl> To: freebsd-hackers@freebsd.org Subject: Re: ZFS regimen: scrub, scrub, scrub and scrub again. Message-ID: <51015523.2060701@platinum.linux.pl> In-Reply-To: <CACpH0McdJOrCgNWCsRwqnO_AvzzzDCx5gQxJL1nvF%2B8=ysqwRg@mail.gmail.com> References: <CACpH0Mf6sNb8JOsTzC%2BWSfQRB62%2BZn7VtzEnihEKmEV2aO2p%2Bw@mail.gmail.com> <alpine.BSF.2.00.1301211201570.9447@wojtek.tensor.gdynia.pl> <20130122073641.GH30633@server.rulingia.com> <alpine.BSF.2.00.1301232121430.1659@wojtek.tensor.gdynia.pl> <51013345.8010701@platinum.linux.pl> <CACpH0McdJOrCgNWCsRwqnO_AvzzzDCx5gQxJL1nvF%2B8=ysqwRg@mail.gmail.com>
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On 2013-01-24 15:45, Zaphod Beeblebrox wrote: > Ok... so my question then would be... what of the small files. If I write > several small files at once, does the transaction use a record, or does > each file need to use a record? Additionally, if small files use > sub-records, when you delete that file, does the sub-record get moved or > just wasted (until the record is completely free)? Each file is a fully self-contained object (together with full parity) all the way to the physical storage. A 1 byte file on RAID-Z2 pool will always use 3 disks, 3 sectors total for data alone. You can use du to verify - it reports physical size together with parity. Metadata like directory entry or file attributes is stored separately and shared with other files. For small files there may be a lot of "wasted" space.
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