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Changing storage strategy
Hello,
is it possible to change existing storage strategy, and how? We are upgrading our Centera, and would like to change from Performance to Capacity, if possible.
Natasa
is it possible to change existing storage strategy, and how? We are upgrading our Centera, and would like to change from Performance to Capacity, if possible.
Natasa
Naty1
8 Posts
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September 30th, 2009 00:00
Product Guide states that "It is not possible to change the protection scheme of data that has already been stored." Therefore I assume it might be changed for new data?
Natasa
Anonymous
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September 30th, 2009 05:00
Keep in mind that there is a software license required to upgrade from CPM to CPP. Also, it is necessary that there be a minimum of 8 nodes in the cluster for CPP to work. Not only that, but it requires that there be 8 nodes in the cluster with free space. For example, let's say your customer started with a 4-node configuration. After a time, they filled these four nodes and are now planning to add four more nodes to cluster and want to convert from CPM to CPP. While you will be able to convert the cluster protection scheme to CPP, the Centera will not be able to store anything using CPP as there will only be four nodes in the cluster with free space on them (remember that the original four nodes are full). In this case, they would need to add 8 nodes to the cluster in order for CPP to work for them.
Dave Remaklus
holgerjakob_c0722c
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September 30th, 2009 06:00
Both changes need to be done with the GlobalServices Version of the viewer connected as emcservice.
set protection write parity thresholdvalue with m2 as fallback will configure all objects bigger than the configured thresholdvalue to be written in parity mode. Should not enough nodes be available Centera would store objects mirrored instead of not accepting them at all.
This is an enduser object/file size threshold value.
set feature storage-strategy capacity will set storage strategy to capacity.
Both settings apply objects written after the changes are made.
Best regards, Holger
Naty1
8 Posts
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October 11th, 2009 22:00
Regards, Natasa