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2296
September 14th, 2010 02:00
Garbage Collection and Centera Pools
Hi
Apologies if this has been asked before (I have spent a long time looking in the docs before posting this!) but could any of you clarify how the garbage collection actually works?
Does it run over the whole Centera irrespective of pools, removing BLOBS which no longer have C-Clips, C-Clips that could have been deleted as long ago as 1 minute before the GCii run?
Should we be running the GCii if we are using an FMA or should we be using the output of the FMA's Stub Scanner to delete the Orphans?
AGain apologies if this has previously been posted but I have looked and looked.......
Many thanks
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Phukon
337 Posts
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September 14th, 2010 05:00
Hello,
Garbage Collection is a continuous background process which ensures that the integrity of every C-Clip is maintained and guaranteed before actually deleting a user file and reclaiming the disk capacity. The optional CentraStar shredding feature ensures that deleted data is not recoverable by any standard means.
Successfully deleted C-Clips serve as the input for the GC process that continuously runs on the background. GC processes deleted C-Clips on a FIFO basis and checks the blobs referenced by each deleted C-Clip.It will delete blobs that are not referenced by another C-Clip. Additionally GC continuously cycles through the entire content of a node to detect orphaned blobs (blobs that are no longer referenced by any C-Clip). To ensure that blobs can be deleted, GC performs a number of checks involving all other nodes in the cluster before deleting any blob. EMC Strongly recommends that Only trained Engineers are allowed to run GCII.
If you have any other concerns on GC Please raise a ticket with EMC.
There is also a thread on GC, you may refer to this link:
https://community.emc.com/message/378337#378337
Regards,
Phukon