Hi all
I have had a ZFS file server for a while now. I recently upgraded it, giving it 16GB RAM and an SSD for L2ARC. This allowed me to evaluate dedupe on certain datasets, which worked pretty well. The main reason for the upgrade was that something wasn't working quite right, and I was getting errors on the disks (all of them) leading to occasional data loss. The first thing I did, therefore, was schedule in regular scrubbing. It was not long before I cut this down from daily to weekly, as no errors were being found but performance during the scrub was, obviously, not so hot. The scrub was scheduled for 4am Sunday morning, when it would have least impact on use, and normally ran for approx 4-6hrs. Recently, however, it has started taking over 20hours to complete. Not much has happened to it in that time: A few extra files added, maybe a couple of deletions, but not a huge amount. I am finding it difficult to understand why performance would have dropped so dramatically. FYI the server is my dev box running Solaris 11 express, 2 mirrored pairs of 1.5GB SATA disks for data (at v28), a separate root pool and a 64GB SSD for L2ARC. The data pool has 1.2TB allocated. Can anyone shed some light on this? Thanks Karl
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