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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