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| Line 33: |
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| [[File:Screenshot-.snapshot_-_bash.png]] | | [[File:Screenshot-.snapshot_-_bash.png]] |
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| An example:
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|
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| Changing to my quotes directory.
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| <pre>
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| [derek@novelty quotes]$ pwd
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| /nfshomes/derek/work/quotes
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| </pre>
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| I see that i have a quote called '''redhat_sole_source_2007.doc'''.
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| <pre>
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| [derek@novelty quotes]$ ls
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| dlt_pdf_quote2007.pdf Quote_300086759.html redhat_solesource.pdf
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| dlt_pdf_quote.pdf Quote_353511914.html soleSource2007.pdf
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| dlt_quote.pdf Quote_367512608.html soleSource.pdf
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| dy1014.xls Quote_367884529.html UMD_008.xls
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| Quote_250530976.html redhat_sole_source_2007.doc
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| </pre>
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| <pre>
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| [derek@novelty quotes]$ ls -la redhat_sole_source_2007.doc
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| -rw-r--r-- 1 derek derek 39936 Jan 23 2007 redhat_sole_source_2007.doc
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| </pre>
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| I will remove it from the current file system.
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| <pre>
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| [derek@novelty quotes]$ rm redhat_sole_source_2007.doc
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| </pre>
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| As you can see it no longer is there.
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| <pre>
| |
| [derek@novelty quotes]$ ls
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| dlt_pdf_quote2007.pdf Quote_250530976.html Quote_367884529.html UMD_008.xls
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| dlt_pdf_quote.pdf Quote_300086759.html redhat_solesource.pdf
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| dlt_quote.pdf Quote_353511914.html soleSource2007.pdf
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| dy1014.xls Quote_367512608.html soleSource.pdf
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| </pre>
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| I am going to go into the last hourly snapshot '''hourly.0'''
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| <pre>
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| [derek@novelty quotes]$ cd .snapshot/hourly.0
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| </pre>
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| As you can see the quote is still here.
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| <pre>
| |
| [derek@novelty hourly.0]$ ls
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| dlt_pdf_quote2007.pdf Quote_300086759.html redhat_solesource.pdf
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| dlt_pdf_quote.pdf Quote_353511914.html soleSource2007.pdf
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| dlt_quote.pdf Quote_367512608.html soleSource.pdf
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| dy1014.xls Quote_367884529.html UMD_008.xls
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| Quote_250530976.html redhat_sole_source_2007.doc
| |
| </pre>
| |
| I copy it back to the original directory.
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| <pre>
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| [derek@novelty hourly.0]$ cp redhat_sole_source_2007.doc /nfshomes/derek/work/quotes/
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| </pre>
| |
| Change back to the original directory.
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| <pre>
| |
| [derek@novelty hourly.0]$ cd /nfshomes/derek/work/quotes/
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| </pre>
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| And it is back.
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| <pre>
| |
| [derek@novelty quotes]$ ls
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| dlt_pdf_quote2007.pdf Quote_300086759.html redhat_solesource.pdf
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| dlt_pdf_quote.pdf Quote_353511914.html soleSource2007.pdf
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| dlt_quote.pdf Quote_367512608.html soleSource.pdf
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| dy1014.xls Quote_367884529.html UMD_008.xls
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| Quote_250530976.html redhat_sole_source_2007.doc
| |
| </pre>
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|
| [[Category:Snapshots]] | | [[Category:Snapshots]] |
| __NOTOC__ | | __NOTOC__ |
Snapshots are a implementation of copy on write that allows for a file system to quickly take a point in time copy of the file system and provide access to the data through a .snapshot directory.
We provide Snapshots on our ONStor, Nexenta and FluidFS filers to certain file systems.
Please see SnapshotFileSystems for a list of our file systems that have snapshots in the department.
Snapshot Policy
Our core file systems in the department are on a 4 hour snapshot cycle. Snapshots are taken at,
| 12am
|
4am
|
8am
|
12pm
|
4pm
|
8pm
|
We retain up to 8 hourly snapshots, 2 daily snapshots and 1 weekly snapshot.
The OpenLAB filesystems on which snapshots are available are listed on the SnapshotFileSystems page.
Snapshot Restoring
If you have deleted a file by mistake and you need to get it back, you can use the snapshots directory to recopy the file. This directory can typically be found in your home directory; it will be prepended by a ., so you will need to use the command "ls -a" to find it. It will be one of three:
The inside of one of these will look something like:
