Date: Tue, 28 Feb 2017 15:04:16 +0000 From: Shiva Bhanujan <Shiva.Bhanujan@Quorum.net> To: =?iso-8859-1?Q?Karli_Sj=F6berg?= <karli.sjoberg@slu.se>, Gary Palmer <gpalmer@freebsd.org> Cc: Jeremy Faulkner <gldisater@gmail.com>, "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: RE: FreeBSD restartable send/receive over WAN Message-ID: <3A5A10BE32AC9E45B4A22F89FC90EC0701BDB12619@QLEXC01.Quorum.local> In-Reply-To: <0719669324a44fe0bfba3e8e08b0ae99@exch2-4.slu.se>
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thanks for all the pointers for the compression algorithms. I ran a few tests to compare compression overhead. These are local zfs send/receive, and no network is involved. time zfs send -v <src-snapshot> | <compress> | <uncompress> | zfs receive -s <dst-snapshot> Here are the performance results that I got. no compression: real 0m20.892s user 0m0.000s sys 0m5.587s xz -0: real 8m38.569s user 10m28.551s sys 0m6.866s pxz -0: real 4m38.448s user 10m55.863s sys 0m13.324s gzip: real 3m51.297s user 4m12.035s sys 0m4.696s lz4: real 0m29.912s user 0m16.543s sys 0m10.810s lz4 has the least overhead in terms of time. pxz/xz seem to be prohibitive give the above results. Unless, there is something basic I'm missing? I was really hoping that compressed sends would be available, as that would actively eliminate this overhead, given that we use lz4 as the compression algorithm when writing to disks. ________________________________ From: Karli Sjöberg [karli.sjoberg@slu.se] Sent: Sunday, February 26, 2017 8:41 AM To: Gary Palmer Cc: Shiva Bhanujan; Jeremy Faulkner; freebsd-fs@freebsd.org Subject: Re: FreeBSD restartable send/receive over WAN Den 26 feb. 2017 4:16 em skrev Gary Palmer <gpalmer@freebsd.org>: > > On Sun, Feb 26, 2017 at 02:08:59PM +0000, Shiva Bhanujan wrote: > > The compression that we use on our ZFS filesystems is lz4. So, if I have to pipe it through a compression algorithm, that'd be uncompressing and compressing it 4 times. > > > > disk (lz4) -> zfs send (uncompress) -> compress (gzip) -> (network) -> uncompress (gzip) -> zfs recv (compress) -> disk (lz4) > > > > isn't this quite expensive? We have to transfer multi terabyte files on a WAN link. I'm also of the understanding that gzip by itself is single-threaded, so that'd peg one of the CPUs to 100%. there might be other compression algorithms that can be used, but sending the ZFS as it is compressed on the filesystem is something that would be optimal, and would reduce the overhead of the additional [de]compressions that are taking place? > > Without going into the efficiency part of your message: > > archivers/pigz: Parallel GZIP > archivers/pbzip2: Parallel BZIP2 > archivers/pixz: Parallel, indexing version of XZ > archivers/pxz: Parallel LZMA compressor using liblzma Also worth mentioning is, obviously: archivers/lz4 :) /K > > Regards, > > Gary > > > > > ________________________________________ > > From: owner-freebsd-fs@freebsd.org [owner-freebsd-fs@freebsd.org] on behalf of Jeremy Faulkner [gldisater@gmail.com] > > Sent: Saturday, February 25, 2017 4:03 PM > > To: freebsd-fs@freebsd.org > > Subject: Re: FreeBSD restartable send/receive over WAN > > > > Pipe it through a compressor > > > > On 2017-02-25 2:09 PM, Shiva Bhanujan wrote: > > > Hi, > > > > > > I just tried restartable send/receive in 10.3 and it works like a charm. I was wondering if compressed send has made its way into FreeBSD? I checked 10.3 and 11.0-RELEASE, and I don't see the -c/--compressed option. Any pointers? > > > > > > Regards, > > > Shiva > > > > > > > > > ________________________________________ > > > From: owner-freebsd-fs@freebsd.org [owner-freebsd-fs@freebsd.org] on behalf of Adam Nowacki [nowakpl@platinum.linux.pl] > > > Sent: Thursday, February 16, 2017 10:41 AM > > > To: freebsd-fs@freebsd.org > > > Subject: Re: FreeBSD restartable send/receive over WAN > > > > > > On 2017-02-16 19:22, Shiva Bhanujan wrote: > > >> Hello, > > >> > > >> I was wondering if restartable send/receive is available in FreeBSD? We're running 10.2 and have a requirement of sending and receiving ZFS snapshots over a WAN link. The snapshots could be more than a few terabytes. > > >> > > >> Can somebody please give me pointers, and if this feature is or isn't available in FreeBSD? > > > > > > FreeBSD 10.3 and later. > > > > > > _______________________________________________ > > > freebsd-fs@freebsd.org mailing list > > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > > _______________________________________________ > > > freebsd-fs@freebsd.org mailing list > > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > > > > _______________________________________________ > > freebsd-fs@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > _______________________________________________ > > freebsd-fs@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org"home | help
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