ext3 performance with external log

Boris Erl borise at comcast.net
Wed Mar 24 20:19:46 UTC 2004


I have strange benchmarking results: ext3 with internal log performs 3 times
faster then with external log.

Linux ES 3.0 (kernel 2.4.21-9.0.1ESsmp), Dell PE 2600, 2 CPU 2.4GHz, 6GB
RAM, Adaptec Ultra 160 SCSI 29160 controller

External hardware 9-disk RAID 0; 512MB write-back controller cache; U160

Benchmark: SpecSFS v 3.0
Mount options: data=journal,sync,

Export options: sync,

With ext3 FS on external 9-disk RAID 0
     internal log  ~  3000 NFS Ops/sec
     external log on a second partition on the same RAID 0 ~ 1000 Ops/sec
     external log on a dedicated HD (without write-back cache) or NVRAM card
~ 1000 Ops/sec

Will appreciate any ideas.

Boris Erlikhman

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