April 30, 20242 yr I have a high-iops pool formed by a bunch of heterogenous ssds (different brands, sizes, etc). This is an awesome idea but my write performance is only about 18MB/s (using fio test) but my read speed is > 680MB/s. I am wondering if I have a specific disk that is going bad or has some very slow speeds. How can I test read/write performance to each specific ssd? I'd prefer not to dismantle the pool. Is there some way to use the /dev/sdag or something to perform a read / write test? Thank you. ``` fio --name=randwrite --ioengine=libaio --iodepth=16 --rw=randwrite --bs=4k --direct=1 --size=512M --numjobs=4 --runtime=60 --group_reporting --directory=/mnt/ssdpool ```
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