Good evening, I have a ZFS pool as a dedicated Bacula spool. The pool contains six 4TB drives, configured as three mirrors of two striped disks. My tape drive is LTO8. All the data is local to the server. When I despool without simultaneously spooling another job, my despool rate is about 280 MB/sec. However, I noticed that when I allow a second job to spool at the same time I despool, the despool rate goes down to as low as 75 MB/sec, with the drive stopping relatively frequently to refill the cache.
I'd like to try to figure out what the bottleneck is in this configuration. I looked at using fio, but I don't want to test random reads and writes... I want to test sequentially reading from one file on the pool while sequentially writing to another. Can anyone suggest a good way of testing this, or maybe point me to some other way of determining the bottleneck? I realize it could be as simple as the disks having poor simultaneous r/w performance, or it could be a limitation with the backplane, HBA, or motherboard. Just trying to drill-down to figure out what, if anything, I can upgrade. Thanks.
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