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Slow Restore Speed From Deduplicated Vault

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I'm running ABR11 . My average restore times for a server in a vault without deduplication is about 10 min. To restore the same server from a vault with deduplication, it takes 50-60min . Backup to the same vault is pretty fast issue is only with restore. I can't see any performance issues in server itself. Are there any known issues with deduplicated vaults?

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* where's your dedup database stored?
* how much RAM do you have?
* do you restore with a cold cache (ASN started fresh) or with hot cache (ASN running for a few hours and using a few gigs of RAM already)?
* What amount of data are we talking about?