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  1. Couchbase Server
  2. MB-37349

cbbackupmgr backup has varying performance because of high fragmentation on Leto-server-04 due to having a faster disk

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    Description

      Observing ~90% drop in cbbackupmgr backup throughput in RC4 build .

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          owend Daniel Owen added a comment -

          Patrick Varley reminded me 04 is the machine where we had the faster drive installed see CBPS-680
          We can see that in the number of items in the disk queue being significantly lower and fragmentation being significantly high

          disk queue for the 4 nodes:

          fragmentation for the 4 nodes:

          So yes Sharath Sulochana we need to perform compaction at the end of the load phase. This will ensure we have the same behaviour / performance for all nodes in the cluster.

          thanks

          owend Daniel Owen added a comment - Patrick Varley reminded me 04 is the machine where we had the faster drive installed see CBPS-680 We can see that in the number of items in the disk queue being significantly lower and fragmentation being significantly high disk queue for the 4 nodes: fragmentation for the 4 nodes: So yes Sharath Sulochana we need to perform compaction at the end of the load phase. This will ensure we have the same behaviour / performance for all nodes in the cluster. thanks

          Daniel Owen sure. I have  enabled compaction for next runs for comparison .

          sharath.sulochana Sharath Sulochana (Inactive) added a comment - Daniel Owen  sure. I have  enabled compaction for next runs for comparison .
          owend Daniel Owen added a comment -

          great - many thanks Sharath Sulochana

          owend Daniel Owen added a comment - great - many thanks Sharath Sulochana

          Also are you recommending compaction at the end of load for all tools tests ?

          Yes - we did it for the XDCR tests a few weeks back, I been meaning to do it since then.

          pvarley Patrick Varley added a comment - Also are you recommending compaction at the end of load for all tools tests ? Yes - we did it for the XDCR tests a few weeks back, I been meaning to do it since then.

          Enabling compaction after loading the doc has resolved the issue . Closing this ticket .

          sharath.sulochana Sharath Sulochana (Inactive) added a comment - Enabling compaction after loading the doc has resolved the issue . Closing this ticket .

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            sharath.sulochana Sharath Sulochana (Inactive)
            sharath.sulochana Sharath Sulochana (Inactive)
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