Hi,in my company we have some sort of database that operates on bit lists read directly from the files on the hard disk. While this is ok if you have an SSD in your server it gets tricky to keep performance up when using an NFS share.
While I was trying to assess different solutions I stumbled upon fio and was happy to see that it can also run in client-server-mode. So I was trying to emulate the following scenario:
- 1 node that takes care of updating the bit lists in the db files, nothing else- 5 nodes that only read from those files and respond to queries, hopefully leveraging the local filesystem or NFS client cache
I read through the HOWTO and tried to pick the options that should simulate the scenario as best as possible. This is what I came up with:
[global] ioengine=sync iodepth=1 size=100% io_size=4g filesize=4g blocksize=64k direct=0 numjobs=4 directory=/mnt/nfs filename_format=index.$filenum fadvise_hint=0 lockfile=readwrite randrepeat=1 nrfiles=8 openfiles=4 runtime=120 ramp_time=10 blocksize=64k file_service_type=random:8 overwrite=1 fsync_on_close=1 random_distribution=zipf:0.6 norandommap file_append=0 rate=1m [reader] rw=randread [writer] rw=randrw rwmixwrite=80 Is this a viable approach or is this scenario not really testable with fio? Thanks, Michael
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