On 01/23/2015 12:22 PM, Radosław Korzeniewski wrote:

> If you are using a vchanger then I guess it is a disk only backup, so why
> do you spool data? It is not required but making you backup slow down at
> least 2 times then standard job.

It's 2 times slower if your spool/despool is strictly sequential and the
same size pipes go in and out. If you have 10 clients spooling over a
1Gb/s link, that's roughly 10MB/s/client. Iostat clocks ext4/basic sata
drives at around 110MB/s write speed, so despooling is 10 times faster.
If only the clients could keep the pipe full, it could be ~10 times
faster than the "standard" job. In a purely hypothetical perfectly
spherical world of uniform density, obviously, but still: no, 2x slow
down is not how it really works.

-- 
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu

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