On Tue, Sep 24, 2019 at 12:05 PM Pete Wright <p...@nomadlogic.org> wrote: > > > > On 9/24/19 8:45 AM, John Fleming wrote: > > Is there anyway to see how busy a SAS/Sata controller is vs disks? I > > have a R720 with 14 Samsung 860 EVOs in it (its a lab server) in raid > > 10 ZFS. > > > > When firing off a dd I (bs=1G count=10) seems like the disks never go > > above %50 busy. I'm trying to figure out if i'm maxing out SATA 3 BW > > or if its something else (like terrible dd options). > > > > my setup is Dell R720 with 2 x LSI 9361 cards. Each card is going to a > > dedicated 8 drive board inside the front of the R720. Basically i'm > > just saying its not a single SAS cable to 14 drives. > > > > Don't have cpu info hand.. zeon something. DDR3-1600 (128GB) > > > > Both controllers are in 8x slots running PCIe gen 3. > > might want to take a look at sysutils/intel-pcm > (https://github.com/opcm/pcm). I *think* this should give you metrics > on PCIe bus utilization among other useful status. >
ok I can check that, but to be clear what i meant was like have i maxed out SATA3 bw on the card not so much PCIe bw. > Also, lookup the bandwidth for the PCIe bus and see if your aggregate > disk throughput on one of the PCIe lanes is saturating the bus (pcm > should also help here). You can also run "zpool iostat -v 2" to see per > disk i/o metrics to help determine if this is an issue. > I think i've looked at that before but i'll check again. > > > BTW i'm sure this has been asked a million times but what would be > > some decent benchmark tests while i'm at it? > > I generally run several tests and then compare results, for example > bonnie++, iozone, iperf (writing over the wire and to disk) as well as > some more realistic scripts based on the use-case i'm building a > solution for. hope that helps. > I've done iperf just across network IO. I'm getting 4x25 Gb/sec so i'm good there i think (Mellonox Connectx4 ethernet mode). I'll poke around with bonnie++ and iozone. I used bonnie++ once but didn't really get what it was telling me but I really didn't put much into it. Thanks! > -pete > > -- > Pete Wright > p...@nomadlogic.org > @nomadlogicLA > _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
