Ceph : Tester les SSD pour valider leurs performances

First disable the write cache on the disk:

bash $ sudo hdparm -W 0 /dev/hda 0

Now you can start benchmarking your SSD correctly using two different methods. The FIO way:

bash $ sudo fio --filename=/dev/sda --direct=1 --sync=1 --rw=write --bs=4k --numjobs=2 --group_reporting --invalidate=0 --name=journal-test

The dd way:

bash $ sudo dd if=randfile of=/dev/sda bs=4k count=100000 oflag=direct,dsync

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