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migrate data from one storagenode to the next
just some basic centera questions:
1) is it possible to migrate data from one storage node to the other storage node?
2) what type of performance tuning can be done on the centera to handle small file sizes 100kb images writes? we're seeing very slow performance on the centera having thousands of small writes to the centera.
thanks for the help!
1) is it possible to migrate data from one storage node to the other storage node?
2) what type of performance tuning can be done on the centera to handle small file sizes 100kb images writes? we're seeing very slow performance on the centera having thousands of small writes to the centera.
thanks for the help!
holgerjakob_c0722c
337 Posts
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October 8th, 2009 23:00
It is not possible to migrate data from one storage node to another. Only Centera Inter-Cluster Migration is available as EMC Customer Service engagement. This will migrate from one cube to a new one and is a way for Centera migrations, not moving only certain data from one node to the next.
As for small objects performance there are two things to take care:
- set storage strategy to performance full with a value of 256k. show features tells you what you have currently configured.
- use embedded blobs. If our application doesn't support it through their configuration please set two environment variables: FP_OPTION_EMBEDDED_
DATA_THRESHOLD to 102400 and FP_OPTION_BUFFERSIZE also to 102400. This reduces Centera object cound and will also ensure that small objects are embedded which should result in better performance as well.
Best regards, Holger
EMCDennis
124 Posts
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October 9th, 2009 06:00
CICM (Centera Intra-cluster Migration) is another tool available to EMC professional services which allows for the migration of data from one cube to another and is used to retire old hardware that exists within an existing cluster a cube at a time.
However, migrating data from one node to another in the same cluster is not possible. You can fail the node and have regeneration run to regenerate all the data that was on that node elsewhere on the cluster but this does not copy the data to one specific node.
I would be curious to know why you need this?
Regarding performance, Holger is right on the money however health issues on the Centera can also cause performance issues. EMC Centera Support can do a health check to see if there are any self healing tasks running that can impact performance.
EMCDennis
124 Posts
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October 9th, 2009 12:00
This will not happen - Failing the node will cause it's data to be regenerated across the cluster not a single node
acon1
9 Posts
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October 9th, 2009 12:00
Forcing one storage node fails and regenerate its data onto another node seems like an interesting idea.
holgerjakob_c0722c
337 Posts
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October 10th, 2009 05:00
I don't recommend to fail a specific node. If that one node has an issue can be investigated by customer service. Centera does a good job to balance load across access nodes and between the different storage nodes.
What makes you think a node has an issue?
As mentioned the regeneration will not regenerate onto a specific other node but in the whole cube/cluster.
Best regards, Holger