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| You may happen to run into the problem of having to back up more data than will fit onto a single tape, like when you have partitions that are much larger as a tape. Over time, the partition will hold more and more data, and if you started with a simple amanda configuration that backs up the partition as a whole, backups will fail sooner or later. Your shiny tape changer isn't all that helpful with this because amanda doesn't automagically change to the next tape to continue writing on it (Upcoming versions of amanda might do that.).
| | #redirect [[How To:Split DLEs With Exclude Lists]] |
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| Thus, the need arises to virtually split partitions into parts so that each part remains smaller than a tape. One way to do that is creating appropriate entries in the [[disklist]].
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| = Example =
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| Let's assume that you have two large partitions, holding several directories and subdirectories like the following:
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| /home/
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| /home/andrew
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| /home/anne
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| /home/brian
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| [...]
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| /home/wanda
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| /home/zeus
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|
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| /share/
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| /share/financial
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| /share/financial/company-a
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| /share/financial/company-b
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| /share/reports
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| You created entries in your disklist to back them up:
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| largehost /home my-dumptype
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| largehost /share my-dumptype
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| That worked fine, but now on each of the partitions, there's too much data to fit onto a single tape. You will have to split up the partitions to back them up.
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| = Splitting it up, the easy part =
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| Considering the /home partition, it becomes obvious that you could split it alphabetically. You would create disklist entries to back up each subdirectory by using wildcards. You also want to catch anything under /home that doesn't fit into the wildcard specifications, so there:
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| largehost /home_a /home {
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| my-dumptype
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| include "./a*"
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| } 1
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| largehost /home_b /home {
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| my-dumptype
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| include "./b*"
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| } 1
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| [...]
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| largehost /home_w /home {
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| my-dumptype
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| include "./w*"
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| } 1
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| largehost /home_z /home {
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| my-dumptype
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| include "./z*"
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| } 1
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| # catch all the rest of /home:
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| largehost /home_rest /home {
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| my-dumptype
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| exclude append "./[a-z]*"
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| } 1
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| Notice the use of the 'include' and 'exclude' options. They do what you would guess, i. e. include the files specified, or exclude them. The tricky part is to use different disk names ('/home_a', '/home_b', ...) on the same partition/mount point ('/home'). You can omit specifying the spindle.
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| = Splitting it up, the more complicated part =
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| The /share partition is a little more complicated to split because you have to deal with the subdirectories. You need to catch /share, /share/financial, /share/financial/company-a, /share/financial/company-b and /share/reports:
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| largehost /share_financial_company-a /share/financial {
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| my-dumptype
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| include "./company-a"
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| } 2
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| largehost /share_financial_company-b /share/financial {
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| my-dumptype
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| include "./company-b"
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| } 2
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| largehost /share_financial_rest /share/financial {
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| my-dumptype
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| exclude append "./company-a"
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| exclude append "./company-b"
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| } 2
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| #
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| largehost /share_reports /share {
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| my-dumptype
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| include "./reports"
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| } 2
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| #
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| largehost /share_rest /share {
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| my-dumptype
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| exclude append "./financial"
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| exclude append "./reports"
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| } 2
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