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тАО04-01-2009 04:27 AM
тАО04-01-2009 04:27 AM
I have an NFS server(/home exported)
I have two options
1, RSYNC
2, DRBD
which of the above options is best in terms of
a, reliability
b, permormance/speed/fast
c, light weight
please suggest
Regards
Maaz
Solved! Go to Solution.
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тАО04-01-2009 06:08 AM
тАО04-01-2009 06:08 AM
Re: rsync vs drbd
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тАО04-01-2009 08:18 AM
тАО04-01-2009 08:18 AM
Solutiona) rsync is very reliable, and can send only changed files saving band with.
b) Due to rycnc sending only changed files this provides superior performance.
c) See past two answers.
rsync can use -e ssh to work through an encrypted ssh data stream, but that slows performance.
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тАО04-01-2009 10:10 PM
тАО04-01-2009 10:10 PM
Re: rsync vs drbd
the primary/actual NFS server is "serverA"
the backup/clone/secondary NFS server is "serverB"
If I go for rsync, I have two options
1
a, on the backup/secondary server(serverB) export /home via NFS
b, mount the /home of serverB on primary Server(ServerA) at /backup_home
c, create a cron job on primary server(ServerA)
*/2 * * * * rsync -av /home /backup_home
2
or the second option is that I configure the rsync server on primary server(serverA), then on secondary/backup server create a cron job
*/5 * * * * rsync -av serverA::home /home
which one is best
Regards
Maaz
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тАО04-01-2009 10:11 PM
тАО04-01-2009 10:11 PM
Re: rsync vs drbd
depending on your link between the 2 sites this could cause problems.
rsync does nothing and waits for you to ask it to syncronise. problem is, if you wait to long site a & b might differ too much, you could lose the changes made since the last update.
i don't know if you have a SAN, but some SAN HW will allow replication on SAN level, perhaps you should look into that. benefits are it is platform independant.
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тАО04-01-2009 10:39 PM
тАО04-01-2009 10:39 PM
Re: rsync vs drbd
nice help/explanations dear Dirk Dierickx
>i don't know if you have a SAN
I am using Linux based iSCSI SAN
please also comment on my previous/last post in this thread
Thanks
Regards
Maaz
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тАО04-02-2009 01:50 AM
тАО04-02-2009 01:50 AM
Re: rsync vs drbd
As for your options, I would go for option 2 because, well It seems simpler to me, you are only rsync every so often.. no fancy set up, keep-it simple.
I would wrap option 2 in a scrip so it send mail/or message on error.
enjoy life.
Jean-Pierre Huc
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тАО04-02-2009 04:29 AM
тАО04-02-2009 04:29 AM
Re: rsync vs drbd
>I would go for option 2 because, well It seems
>simpler to me, you are only rsync every so
>often
you suggest the following
configure the rsync server on primary server(serverA), then on secondary/backup server create a cron job
*/5 * * * * rsync -av serverA::home /home
instead of
a, on the backup/secondary server(serverB) export /home via NFS
b, mount the /home of serverB on primary Server(ServerA) at /backup_home
c, create a cron job on primary server(ServerA)
*/2 * * * * rsync -av /home /backup_home
am I right ?
Regards
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тАО04-02-2009 07:01 AM
тАО04-02-2009 07:01 AM
Re: rsync vs drbd
I realize the above is just based on my own experience you may be more at ease then me as for as usage of NFS is concerned.
Enjoy life.
Jean-Pierre Huc
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тАО04-03-2009 12:15 AM
тАО04-03-2009 12:15 AM
Re: rsync vs drbd
Thanks and Regards
Maaz