DragonFly users List (threaded) for 2008-07
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DragonFly users List (threaded) for 2008-07
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Hammer on-the-move

From: Michael Neumann <mneumann@xxxxxxxx>
Date: Thu, 10 Jul 2008 14:38:04 +0200


I think it shouldn't be too hard to switch a hammer master into a slave
and a slave to a master, isn't it?

The reason why I'd love to do that is the following:

At home, I'd like to access my files from the central file-server. This
is even much faster than doing the same via a slow laptop hard disk. The
central file-server is now the master (or the /home/mneumann pfs).

Now I want to travel around for a while and of course I don't want to go
without my home directory :)

So I mirror the central /home/mneumann to my local hard disk and switch
it (the central /home/mneumann) into a read-only slave. At the same
time, I switch the local /home/mneumann to a master and mount it
read/write. When I come back from my travel (if I come back ;-), I
mirror back the changes from local -> central and again switch the
master into a slave and vice versa.

The main advantages are:

  * You always have a backup around. You shouldn't care too much
    if your laptop gets stolen.

  * You can access your files quickly when at home (using RAID to
    accelerate) over NFS/Samba

* Synchronization should be very fast unlike maybe rsync etc.

Btw, what would happen if I'd accidentially mount the central
file-server which right now acts as a slave read/write, modify some
files, and then mirror from the master? That is, the situation when
there are (accidentially) two masters. Will it do much harm to the file

Many years ago I really hoped that what I descibed above would work out
well using the Coda File System. Then came hammer... :)



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