I THINK YOUR A VERY SAD BUNCH OF LIFES WAISTERS
On Wed, Dec 8, 2010 at 7:00 PM, <rsync-request at lists.samba.org>
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> Today's Topics:
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> ? 1. DO NOT REPLY [Bug 7854] New: Abysmal sparse file performance
> ? ? ?(samba-bugs at samba.org)
> ? 2. Re: Simple Question (Henri Shustak)
>
>
> ---------- Forwarded message ----------
> From:?samba-bugs at samba.org
> To:?rsync-qa at samba.org
> Date:?Tue, 7 Dec 2010 21:09:47 -0600 (CST)
> Subject:?DO NOT REPLY [Bug 7854] New: Abysmal sparse file performance
> bugzilla.samba.org/show_bug.cgi?id=7854
>
> ? ? ? ? ? Summary: Abysmal sparse file performance
> ? ? ? ? ? Product: rsync
> ? ? ? ? ? Version: 3.0.7
> ? ? ? ? ?Platform: x86
> ? ? ? ?OS/Version: FreeBSD
> ? ? ? ? ? ?Status: NEW
> ? ? ? ? ?Severity: major
> ? ? ? ? ?Priority: P3
> ? ? ? ? Component: core
> ? ? ? ?AssignedTo: wayned at samba.org
> ? ? ? ?ReportedBy: grarpamp at gmail.com
> ? ? ? ? QAContact: rsync-qa at samba.org
>
>
> I have a 5.5GB file, mostly sparse. Tar performs far[!] better than rsync.
> I have no ideas yet, so just an FYI as to current state.
> FreeBSD 8.1 i386 zfs
> Yes, I know the blocks used differs but don't know why yet, could
> be just how zfs does things or related to the large amount of sparseness.
> There are no media errors, CPU/IO load or anything like that and the source
> and dest paths are on the same filesystem.
> I've not tested times for files that are, say, 90% full instead of 90%
sparse
> Though a 50% 35MB file was 8.5x slower than tar and had identical
> block counts and sha256 with both.
>
> /usr/bin/time rsync -HaxiS ./a ../
>>f+++++++++ a
> ? ? ?271.13 real ? ? ? 101.44 user ? ? ? ?95.62 sys
> ls -sl ./a ../a ; rm -f ../a
> blocks bytes
> 3625 5535932416 ./a
> 3769 5535932416 ../a
>
> /usr/bin/time tar -cf - ./a | /usr/bin/time tar -C .. -Sxf -
> ? ? ? 57.67 real ? ? ? ? 1.10 user ? ? ? ?27.77 sys
> ? ? ? 57.67 real ? ? ? ?10.68 user ? ? ? ? 5.87 sys
> ls -sl ./a ../a ; rm -f ../a
> blocks bytes
> 3625 5535932416 ./a
> 2977 5535932416 ../a
>
>
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> ---------- Forwarded message ----------
> From:?Henri Shustak <henri.shustak at gmail.com>
> To:?rsync <rsync at lists.samba.org>
> Date:?Wed, 8 Dec 2010 23:49:26 +1300
> Subject:?Re: Simple Question
>> I have been using rsync on my laptop for some time to safeguard an
>> extensive image collection.
>> My usage has been: .. rsync -av --delete ~/Pictures /media/disk
>> I have found this exceptionally fast ... just as advertised!
>>
>> I now have set up a new computer system where I want to back up my
/home
>> to a sata drive.
>> My phrase for this is: .. rsync -av --delete /home/david /media/Sata
>> Which appears to be identical to my earlier usage .. but .. rsync
>> appears to be totally rewriting the backup and instead of being able to
>> get a quick refresh, the backup is now taking an hour or more.
>>
>> Any idea what is going on?
>
>
> On which operating system are you executing rsync? If you are using Mac OS
X, often permissions are ignored on non-boot drives by default.
>
> Information on enabling permissions is available from the following URL
(Instructions at the following link are specific for Mac OS X systems) :
<lbackup.org/permissions>
>
> This is just one possible reason you are having issues.
>
>
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