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6.1

Rsync Speed issue

Asked by bnoyzy in rSync Backup Utility, Unix Systems Programming, Hard Drives & Storage

Tags: Rsync, readynas, backups, linux, unix

Hi,
I am currently having a little trouble with the speed of my rsync command between 2 ready nas DUOs.

The rsync process runs between 2 netgear ready nas duo devices and the files involved are backup files created by Acronis True Image Backup software. These files are very large (a full backup is about 70GB and the differential backups are about 15GB each per day). This means a single directory can have over 100GB made up of just a few files within.

The command I am using currently outside my bash script to see the progress live is:

rsync --verbose --progress --stats --recursive --times --perms --links --delete /backup/* READYNAS01::backup

The command works how I intended but I believe I require more knowledge of what rsync is actually doing behind the scenes so I can understand why it is taking so long and how I can fix this issue.
I am guessing the problem is where rsync compares the directories for changes.
Does it look through the entire file for where data has changed or does it simply compare dates and sizes?
I find that with the above used information output switches (--verbose --progress --stats) there is a long period of time between outputting the directory and before actually transferring the files found different within that directory.
Is it looking inside the 100GB of data for changes instead of just the comparing their sizes and dates to know if to overwrite them with the sources files.
Is there a switch I have missed that can fix this?


[+][-]09/09/09 05:24 AM, ID: 25290375Accepted Solution

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About this solution

Zones: rSync Backup Utility, Unix Systems Programming, Hard Drives & Storage
Tags: Rsync, readynas, backups, linux, unix
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Solution Provided By: jmcse1
Participating Experts: 2
Solution Grade: B
 
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