Backup Central

Thanks for the advice, _most_ responsive list I belong to! cheers! gary

2011/12/19 Rados³aw Korzeniewski <radoslaw < at > korzeniewski.net>:
Hello,

2011/12/16 gary artim <gartim < at > gmail.com>

No, just Spool Attributes = yes. g.


A "direct" backup from FD into a SD tape device is performed with a little
buffering and require more computation, disk seeks and context switching. It
is a single, complicated chain with two threads one for FD and one for SD
connected through logical network layer (even when a full backup is
performed on local machine). With this chain it is very hard to get a full
LTO speed. As opposite when you perform SD data spooling, you can easy
achieve a full LTO speed because a writing chain (despooling) in SD is very
simple and effective. Unfortunately doing a data spool takes a long time and
slow down an overall backup speed.

best regards
--
Rados³aw Korzeniewski
radoslaw < at > korzeniewski.net

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Il 19/12/2011 17:32, gary artim ha scritto:
Thanks for the advice, _most_ responsive list I belong to! cheers! gary

2011/12/19 Rados³aw Korzeniewski <radoslaw < at > korzeniewski.net>:
Hello,

2011/12/16 gary artim <gartim < at > gmail.com>

No, just Spool Attributes = yes. g.


A "direct" backup from FD into a SD tape device is performed with a little
buffering and require more computation, disk seeks and context switching. It
is a single, complicated chain with two threads one for FD and one for SD
connected through logical network layer (even when a full backup is
performed on local machine). With this chain it is very hard to get a full
LTO speed. As opposite when you perform SD data spooling, you can easy
achieve a full LTO speed because a writing chain (despooling) in SD is very
simple and effective. Unfortunately doing a data spool takes a long time and
slow down an overall backup speed.

best regards
--
Rados³aw Korzeniewski
radoslaw < at > korzeniewski.net

Would be curious to know if data spooling made any difference...
Cheers!

--
Marcello Romani

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Hello,

W dniu 20 grudnia 2011 10:30 użytkownik Marcello Romani <mromani < at > ottotecnica.com ([email]mromani < at > ottotecnica.com[/email])> napisał:
>> A "direct" backup from FD into a SD tape device is performed with a little
buffering and require more computation, disk seeks and context switching. It
is a single, complicated chain with two threads one for FD and one for SD
connected through logical network layer (even when a full backup is
performed on local machine). With this chain it is very hard to get a full
LTO speed. As opposite when you perform SD data spooling, you can easy
achieve a full LTO speed because a writing chain (despooling) in SD is very
simple and effective. Unfortunately doing a data spool takes a long time and
slow down an overall backup speed.



Would be curious to know if data spooling made any difference...
Cheers!

In my reference system I've got an average backup speed of 30-40MB/s when I run a backup job with a FD->SD->LTO chain (without spooling) on local machine (full backup of a few very large files). And I've got an 80MB/s despooling speed on the same machine and LTO.

best regards



--
Radosław Korzeniewski
radoslaw < at > korzeniewski.net ([email]radoslaw < at > korzeniewski.net[/email])