This is all running on TrueNAS, so BSD. The HBA is an LSI 9220-8i. The NIC is 10Gb, but not relevant here because the data and the tape library are all on the same system. The disks are SATA. 32GB RAM, but I don't see the system running out of RAM while spooling/despooling. The JBOD enclosures are DS4243s, and I have a 54 disk pool of SATA disks in raidz2 (six disks per vdev).
Thanks. On Tue, Sep 17, 2024 at 1:09 AM Gary R. Schmidt <g...@mcleod-schmidt.id.au> wrote: > On 17/09/2024 08:58, B. Smith wrote: > > 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. > > > Which ZFS are you using? Solaris, BSD, or Linux? > > What's the HBA? NICs? > > Are the disks SATA (so one-way only) or SAS (two-way)? > > How much physical RAM does the system have? > > I don't see this, but I am running Solaris with SAS disks in a RAIDZ > pool and 72Gb of RAM. > > Cheers, > Gary B-) > > > _______________________________________________ > Bacula-users mailing list > Bacula-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/bacula-users >
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