On 13/04/2011 11:21 AM, Timothy J Massey wrote:
ZFS.
Sorry, unexplainable brain fade. Maybe I should concentrate more on what
I write. ZFS.
Remember, you have to get them to another machine, so ZFS or any other
snapshot by itself won't finish the job: you then need to copy them
somewhere else. This includes SAN based solutions (though in that
case, "somewhere else" might just be defined as a different storage
shelf...).
Ah, but that is where ZFS still provides the solution. Getting the data
somewhere else is as simple as:
[root@solaris]$ zfs snapshot master/data@1
[root@solaris]$ zfs send master/data@1 | zfs receive slave/data
The slave server, will now have an identical copy of the master. (Make it
readonly for now however)
And the next time,
[root@solaris]$ zfs snapshot master/data@2
[root@solaris]$ zfs send -i master/data@1 master/data@2 | zfs receive slave/data
You will have only sent the differences between this snapshot and the last
across.
So unlike ext3 + snapshots, ZFS will allow you to efficiently transfer your
pool to another server.
So, I stick by my 4 options, with one of them possibly slightly renamed.
You might have me by definition on this. However, I like to think of ZFS
as significantly more capable than other snapshot techniques. However,
it comes with the obvious downside of having to run Solaris. (FreeBSD is
an option, but reportly the ZFS support isnt quite there yet.)
Distributions like Nexenta can somewhat mitigate against this however.
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