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June 11th, 2010 08:00
What happens if the Snap save pool gets full
What happens if the Snap save pool gets full (DMX 3000 & 1000) ?
We've measured our workload change rate & it's low, so we're thinking about reducing the Save pool size.
We're worried about what happens if it gets full.
Steve
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dynamox
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June 11th, 2010 09:00
Monitoring SAVE device usage
Using virtual copies requires proper planning to prevent the SAVE devices from
filling up with pre-updated data. If the SAVE devices fill up, you will begin to lose the
pre-update images of the newly changed tracks in the virtual copy session, the virtual
device will be set to Not Ready, and the session will fail (only sessions with I/O
activity will be in a failed state, sessions without I/O activity will continue to operate
normally). Should this happen, you must terminate the failed sessions to clear the
tracks on the SAVE devices. Once a session is terminated, the virtual data is lost and
the SAVE device space associated with the session is freed and returned to the SAVE
device pool for TimeFinder/Snap use. In addition, you should also examine how you
are using the SAVE device pools and consider adding more SAVE devices.
You can monitor SAVE devices by using the symsnap monitor command to check the
percentage full. When devices reach the specified percentage, an optional action
script can be executed by the application to preserve the data or terminate sessions
SPrior
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June 11th, 2010 11:00
Thanks very much for the info, we've never hit this situation after 6 years of running and want to ensure it doesn't happen in the future. We do monitor the usage regularly, but knowing that we will lose the snap session means we can have recovery processes in place in case it ever happens.
Regards
Steve