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Hi, I’m experiencing READ performance issues in my Cluster. I have 3 x86 servers each with 2 SSDs and 9 OSDs. SSDs are being used for Journaling. I seem to get erratic READ performance numbers when using Rados Bench read test. I ran a test with just a single x86 server, with 2 SSDs, and 9 OSDS. Pool had replication factor of 3. Write Bandwidth : 527 MB/Sec (rados bench write with default options) Read Bandwidth : Run 1 : 201 MB/Sec (redos bench read with same pool as write). Read Bandwidth : Run 2 : 381 MB/Sec Read Bandwidth : Run 2 : 482 MB/Sec In Run 2 and Run 3 : I start off with 1100 MB/Sec (basically maxing out my 10G Link), but by the time the 60 second read test finishes, the bandwidth drops to 400 MB/Sec range. Any ideas to what might be going wrong? Overall my writes are faster than reads. That doesn’t seem correct. Thanks Pankaj |
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