Hi, I've been trying to tweak and improve the performance of our ceph cluster. One of the operations that I can't seem to be able to improve much is the delete. From what I've gathered every time there is a delete it goes directly to the HDD, hitting its performance - the op may be recorded in the journal but I don't notice almost any impact. >From my tests (1M files with 512k) writing the data will take 2x as much as the delete operation - should there be a bigger difference? And whilst the delete operation is running all the remaining operations will be slower - it does impact the whole cluster performance in a significant way. Is there any way to improve the delete performance on the cluster? I'm using S3 to do all the tests, and the .rgw.bucket.index is already running from SSDs as is the journal. I'm running firefly 0.80.1. thanks, -- Luis Periquito Unix Engineer Ocado.com <http://www.ocado.com/> Head Office, Titan Court, 3 Bishop Square, Hatfield Business Park, Hatfield, Herts AL10 9NE -- Notice: This email is confidential and may contain copyright material of members of the Ocado Group. Opinions and views expressed in this message may not necessarily reflect the opinions and views of the members of the Ocado Group. If you are not the intended recipient, please notify us immediately and delete all copies of this message. Please note that it is your responsibility to scan this message for viruses. References to the ?Ocado Group? are to Ocado Group plc (registered in England and Wales with number 7098618) and its subsidiary undertakings (as that expression is defined in the Companies Act 2006) from time to time. The registered office of Ocado Group plc is Titan Court, 3 Bishops Square, Hatfield Business Park, Hatfield, Herts. AL10 9NE. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140815/8418aabc/attachment.htm>
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