Date: Mon, 4 Feb 2013 22:25:33 +0100 From: mhca12 <mhca12@gmail.com> To: dweimer@dweimer.net Cc: freebsd-questions@freebsd.org Subject: Re: geli overhead? Message-ID: <CAHUOmanYfr2B0sM%2B4mtzJnwyAWXf7uLTWF8mKWSMpiqJcg6fgQ@mail.gmail.com> In-Reply-To: <abe71e782475fd98aef8e77721e3be9b@dweimer.net> References: <CAHUOmamYud7md9=5yYfWvEsQZUWKHgPRUdwhUpaNae71B-nxvA@mail.gmail.com> <abe71e782475fd98aef8e77721e3be9b@dweimer.net>
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On Mon, Feb 4, 2013 at 10:19 PM, dweimer <dweimer@dweimer.net> wrote: > On 02/04/2013 2:56 pm, mhca12 wrote: >> >> Is there some overhead associated with the geli setup as >> described earlier? >> >> $ df -h >> Filesystem Size Used Avail Capacity Mounted on >> /dev/ada0p3.eli 127G 6.9G 119G 5% / >> devfs 1.0k 1.0k 0B 100% /dev >> /dev/gpt/boot 991M 339M 642M 35% /bootdir >> $ gpart show >> => 34 312581741 ada0 GPT (149G) >> 34 128 1 freebsd-boot (64k) >> 162 2097152 2 freebsd-ufs (1.0G) >> 2097314 310484461 3 freebsd-ufs (148G) >> >> Where did 21G from the 148G go? >> >> As suggested in dan.me.uk geli install guide I used geli init -a >> HMAC/SHA256 >> and also ran dd if=/dev/zero of=/dev/gpt/enc.eli across the eli volume. >> _______________________________________________ >> freebsd-questions@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-questions >> To unsubscribe, send any mail to >> "freebsd-questions-unsubscribe@freebsd.org" > > > Did you use the -a option when doing the geli init? > > > -a aalgo Enable data integrity verification (authenti- > cation) using the given algorithm. This > will > reduce size of available storage and also > reduce speed. For example, when using 4096 > bytes sector and HMAC/SHA256 algorithm, 89% > of > the original provider storage will be avail- > able for use. Currently supported > algorithms > are: HMAC/MD5, HMAC/SHA1, HMAC/RIPEMD160, > HMAC/SHA256, HMAC/SHA384 and HMAC/SHA512. > If > the option is not given, there will be no > authentication, only encryption. The recom- > mended algorithm is HMAC/SHA256. Yes I did (see above). Do I have to init the volume again to skip authentication? Does skipping authentication also remove the requirement of zeroing the whole eli disk for the checksums?home | help
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