On 05/03/12 21:37, Alan Brown wrote:
> On 05/03/12 19:51, Alex Crow wrote:
>
>> Thanks Alan,
>>
>> I am specifically addressing the encryption support within Bacula:
>>
>> http://www.bacula.org/en/dev-manual/main/main/Data_Encryption.html
> Openssl compresses _if_ compiled with zlib (it usually is)
>
> It's not hard to test, write to a file instead of tape media and compare
> size vs a tarball.
>
> If you are using a LTO device with built-in encryption then it's much
> faster as there is a dedicated engine for the task (LTO encryption is
> posrtable across drives as long as the key is retained)
>
> On that basis I'd only use bacula encryption for disk-based backups or
> on tape devices without builtin encyption.
>
>
>
Alan,
We tried removing the compression on some jobs, and we got a great speed
boost. However, the SSL compression was either absent or minimal, even
though OpenSSL libs are compiled with zlib:
[root@backup ~]# ldd /usr/lib/libssl3.so
linux-gate.so.1 => (0xffffe000)
libnss3.so => /usr/lib/libnss3.so (0xf7e6b000)
libnssutil3.so => /usr/lib/libnssutil3.so (0xf7e52000)
libplc4.so => /usr/lib/libplc4.so (0xf7e4e000)
libplds4.so => /usr/lib/libplds4.so (0xf7e4a000)
libnspr4.so => /usr/lib/libnspr4.so (0xf7e10000)
libpthread.so.0 => /lib/libpthread.so.0 (0xf7df7000)
libdl.so.2 => /lib/libdl.so.2 (0xf7df2000)
libc.so.6 => /lib/libc.so.6 (0xf7c99000)
libz.so.1 => /lib/libz.so.1 (0xf7c86000)
/lib/ld-linux.so.2 (0x00a5e000)
[root@backup ~]#
Any ideas why compression in OpenSSL does not seem to be working?
Thanks
Alex
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