John Drescher wrote:
>>>> Yes, but most people use hardware compresion with LTO drives. Sooner
>>>> or later he has to test the drive with compression.
>>>>
>>>>         
>>> ----
>>> funny thing is that amanda developers are adamant that you disable
>>> hardware compression and use software compression instead.
>>>
>>>       
>
> Do they even say this for LTO4? I mean I have not seen a CPU can
> compress any where near 120MB/s.

I don't have LTO4, but I do have a few Sun T5220 servers. The T2 chip 
has 8 core with 8 threads per core. Each core also has an FPU and an 
encryption accelerator. The Solaris 10 system libraries have direct 
tie-ins to the accelerators, and the openssl and compression tools that 
are part of the Solaris 10 install use those libraries. The T5220 also 
has 4 GigE interfaces, and the T2 chip has circuitry for two 10GigE 
connections directly on the chip.

In any case, Amanda would typically be configured with holding disk 
space and the backups would be spooled and compressed there before 
pushing it out to tape. So, again, the sysadmin would juggle and tune 
those options to get the best overall system performance. With the T2, 
there could be multiple backup processes running and compressing 
simultaneously.

-- 
---------------

Chris Hoogendyk

-
   O__  ---- Systems Administrator
  c/ /'_ --- Biology & Geology Departments
 (*) \(*) -- 140 Morrill Science Center
~~~~~~~~~~ - University of Massachusetts, Amherst 

<hoogendyk AT bio.umass DOT edu>

--------------- 

Erdös 4



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