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backup size estimation using vbr
Hi,
we are planning to perform backup of our 3-Node cluster and take backup to a remote server rather than keeping locally on same server. Is there any calculation available to estimate the size of backup will be generated using vbr.py.
We wish to calculate size of
1) Full DB backup.
2) restore point backup.
based on these calculation, we can decide how big my backup server should be?
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There is a section in the docs called "Estimating Backup Host Disk Requirements".
Take a look here:
https://www.vertica.com/docs/9.1.x/HTML/index.htm#Authoring/AdministratorsGuide/BackupRestore/ConfiguringBackupHosts.htm
Hi Jim,
we have read this section before but it is not sufficient to fully estimate disk requirement. i will give you an example:
My DB version is 8.1:
from my test lab, we have 3 nodes and storage where i keep my ROS is :
/data/vdb whereas i kept my backup under /backup.
[dbadmin@Vertest3 ~]$ for i in 1 2 3; do ssh -q h$i "du -sh /data/vdb "; done
5.1G /data/vdb
12G /data/vdb
11G /data/vdb
[dbadmin@Vertest3 ~]$ for i in 1 2 3; do ssh -q h$i "du -sh /backup"; done
5.4G /backup
5.4G /backup
5.4G /backup
Even in incremental backup, if my DB is sitting idle with no change ( no insertion/updates/deletes), sometimes vbr generates incremental backup of 82Mb and sometimes it generates it for 2.8G.
Since, this test Lab is very small as compared to our production, such difference may be ignored but we are planning to take backup of 600G per node on production DB.