Difference between revisions of "ShadowCopy"
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Note that a new snapshot is only taken if files have changed. | Note that a new snapshot is only taken if files have changed. | ||
Revision as of 05:09, 27 September 2009
ShadowCopy
ShadowCopy takes a snapshot of ibays and user home folders at scheduled intervals and allows network users to restore previous versions of files via the Windows Explorer file properties page.
This works for Windows XP and above.
To obtain a client for Windows 2000SP3+ download from here.
RPM version requirements
This functionality is included in e-smith-samba since version 1.14.0-20.
To check the installed rpm version
rpm -q e-smith-samba
On a SME Server 7.3 server this gives e-smith-samba-1.14.1-3.el4.sme so the installed rpm is more recent than that required.
Configuration
Enabling and disabling
Initially disable ShadowCopy for specific ibays or users you don't wish to take snapshots for eg
db accounts setprop user1 ShadowCopy disabled db accounts setprop user2 ShadowCopy disabled db accounts setprop ibay1 ShadowCopy disabled db accounts setprop ibay2 ShadowCopy disabled
To re-enable any disabled ibays or users do:
db accounts delprop user1 ShadowCopy db accounts delprop ibay2 ShadowCopy
Then enable and expand templates
config setprop smb ShadowCopy enabled signal-event ibay-modify
Adding ibays and users to your server
Add ibays and users to your sme server in the normal way. If ShadowCopy is enabled, then by default the newly added ibays and users will be included in ShadowCopy behaviour, so you must specifically exclude them from ShadowCopy behaviour using the disable commands mentioned above on a per ibay and user basis.
Snapshots
You need to schedule shadow copy to take snapshots. You can do this manually from the command prompt or run a cron job as often as required. Snapshots are only taken if there are changes.
At the command prompt do
/etc/e-smith/events/actions/shadow-copy-rotate
Setup Cron
A cron job that runs the script every hour from 10am to 5pm on weekdays would contain the following. Adjust to suit your requirements, Shadow copy keeps 64 copies so you may like to save less often.
Create a file
pico -w /etc/cron.d/shadowcopysnapshot
which contains
# Shadow Copy snapshot Crond Entry #+-----------------------Minute (0-59) #| +-------------------Hour of Day (0-23) #| | +---------------Day of Month (1-31) #| | | +-----------Month of Year (1-12) #| | | | +-------Day of Week (0=Sun,6=Sat) #v v v v v 00 10,11,12,13,14,15,16,17 * * 1,2,3,4,5 root /etc/e-smith/events/actions/shadow-copy-rotate
To save
Ctrl o
To exit
Ctrl x
After saving the above script do
/etc/init.d/crond restart
Location of ShadowCopy files
NB. Users recover files with windows explorer.
The ShadowCopy files are located in:
/home/e-smith/files/.shadow/1 /home/e-smith/files/.shadow/2 /home/e-smith/files/.shadow/3 and so on...
The number of subfolders depends on how many snapshots have been taken.
Note that a new snapshot is only taken if files have changed.
Bugs
If you find a problem report it to the bug tracker at bugs.contribs.org
References
Shadow Copy topic in the Contribs forums
For background information regarding alternative Linux implementation, although this contrib is not used here
http://www.wlug.org.nz/SambaShadowCopyHowto
