Date: Tue, 11 Aug 2009 19:09:47 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Jay Hall <jhall@socket.net> Cc: freebsd-questions@freebsd.org Subject: Re: Backup Size Message-ID: <20090811170947.GA88617@slackbox.xs4all.nl> In-Reply-To: <D0D2566C-8912-4F77-BB54-714C7DB4B2D2@socket.net> References: <6206A242-7226-48E3-8D09-A1D3A651F2A8@socket.net> <20090810162528.GA49364@slackbox.xs4all.nl> <20090810170921.GC49364@slackbox.xs4all.nl> <D0D2566C-8912-4F77-BB54-714C7DB4B2D2@socket.net>
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[-- Attachment #1 --] On Mon, Aug 10, 2009 at 09:24:19PM -0500, Jay Hall wrote: > > On Aug 10, 2009, at 12:09 PM, Roland Smith wrote: > > >> The fact that you are using tar also plays a part. Tar has some > >> overhead to > >> store information about the files it contains. > > Is it possible to calculate the amount of overhead tar will use? Just execute the tar command, and dump the output to /dev/null through dd: tar -cf - /etc |dd of=/dev/null tar: Removing leading '/' from member names 3160+0 records in 3160+0 records out 1617920 bytes transferred in 0.057690 secs (28045115 bytes/sec) This will give you the exact size without writing anything to disk. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkqBpdsACgkQEnfvsMMhpyXt6wCeNAXOJ0BDs/vVk4DAi1wybZVX qLUAnRS3LC5zAUCc0G7a1Pq5wdgdOsa1 =Xdht -----END PGP SIGNATURE-----help
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