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PostgresConf 2019 Summary

https://ardentperf.files.wordpress.com/2019/03/pgconf-2.jpg?w=600&h=450 600w, https://ardentpe

PostgresConf 2019 Summary

https://ardentperf.files.wordpress.com/2019/03/pgconf-2.jpg?w=600&h=450 600w, https://ardentpe

PostgresConf 2019 Summary

https://ardentperf.files.wordpress.com/2019/03/pgconf-2.jpg?w=600&h=450 600w, https://ardentpe

Friday Philosophy Guest: Open Source Projects

This post is Guest Post by my friend Liron Amitzi, an Oracle Ace, presenter and instructor who specialises in Oracle design & infrastructure. You can find his blog over here.  And with that, over to you Liron :-)

 

I have been wondering about open source projects for a while. I’ve talked to quite a few people about it, and still don’t really understand some of it. So I decided to write a post about my thoughts regarding this issue.

I’m not going to talk (or even mention) specific projects, but it is very interesting to me how these projects run.

fsfreeze in Linux

The fsfreeze command, is used to suspend and resume access to a file system. This allows consistent snapshots to be taken of the filesystem. fsfreeze supports Ext3/4, ReiserFS, JFS and XFS.

A filesystem can be frozen using following command:

#cccccc;line-height: 1.4"># /sbin/fsfreeze -f /data

Now if you are writing to this filesystem, the process/command will be stuck. For example, following command will be stuck in D (UNINTERUPTEBLE_SLEEP) state:

#cccccc;line-height: 1.4"># echo “testing” > /data/file

Only after the filesystem is unfreezed using the following command, can it continue: