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Mailbox archive indexes rarely grow that large, however Journal archive indexes will grow until the reach the default maximum number of locations, which by default is 2 Billion in EV 6 sp1 and above. Leaving the default setting will result in Index Volumes over 15 GB’s in size! Such large indexes being searched by CA or DA can result in out of memory issues and slow search performance and lead to the index volumes being marked as Failed.
For this reason it is Best Practice to set the AVSMaxLoc registry key to keep the index volumes from becoming unmanageable. Setting this key will cause your index volumes to automatically roll over sooner. If you already have large index volumes in your environment you will need to rebuild them using the IndexVolumeReplay utility.
We have found that setting this key will allow CA and DA searches perform better and additionally,