[discuss] zero iostat for nvme block devices

[Udo Grabowski (IMKASF)]

Hi,

someone once posted the ideas first script below to zero out
spurious device errors from iostat for scsi devices. But that one
doesn't work for NVME block devices, so (after a couple of month
occasionally staring at kernel code to find the relevant structures)
I finally found the relevant structures and wrote the second script
below. -h -s -t are for hard/soft/transport errors, without options
it zeros all those errors. Just use the bare device name (e.g.,
c9t8CE38EE200A8FD01d0) as given from iostat -exn.

#======================= scsi devices ============================
ro sunth9 ~ # cat /imksun/bin_rootcsh/zero_iostat
#!/bin/ksh93
os=`uname -r`
if [ $os != '5.10' -a $os != '5.11' ]; then
echo "Sorry $os is not supported"
exit
fi
if [ $# -lt 1 -o $# -gt 4 ]; then
   echo "Usage : zero_iostat [-h|-s|-t] <device> or <sdnn>"
   exit
fi
if [ $# -eq 1 ]; then
   sh=1;ss=1;st=1;dev=$1;
else
   sh=0;ss=0;st=0;
   for p in $@; do
       if [ $1 == '-h' ]; then
          sh=1
       elif [ $1 == '-s' ]; then
          ss=1
       elif [ $1 == '-t' ]; then
          st=1
       else
          dev=$1
       fi
       shift
   done
fi


lun=0x`echo "obase=16;$un"|bc`
sd=`echo "*sd_state::softstate $lun" | mdb -k`
if [ -z "$sd" ] ; then exit 1; fi
es=`echo "$sd::print struct sd_lun un_errstats"| mdb -k | cut -d" " -f3`
ks=`echo "$es::print kstat_t ks_data" |  mdb -k | cut -d" " -f3`
if [ $sh -eq 1 ]; then
   echo Resetting Hard Error

   echo $ha/W 0 | mdb -kw
fi
if [ $ss -eq 1 ];then
   echo Resetting Soft Error

   echo $ha/W 0 | mdb -kw
fi
if [ $st -eq 1 ]; then
   echo Resetting Tran Error

   echo $ha/W 0 | mdb -kw
fi
exit 0

#======================= NVME blockdevices ============================
ro sunth9 ~ # cat /imksun/bin_rootcsh/zero_nvme_iostat
#!/bin/ksh93
os=`uname -r`
if [ $os != '5.11' ]; then
echo "Sorry $os is not supported"
exit
fi
if [ $# -lt 1 -o $# -gt 4 ]; then
   echo "Usage : zero_iostat [-h|-s|-t] <device> or <sdnn>"
   exit
fi
if [ $# -eq 1 ]; then
   sh=1;ss=1;st=1;dev=$1;
else
   sh=0;ss=0;st=0;
   for p in $@; do
       if [ $1 == '-h' ]; then
          sh=1
       elif [ $1 == '-s' ]; then
          ss=1
       elif [ $1 == '-t' ]; then
          st=1
       else
          dev=$1
       fi
       shift
   done
fi


lun=0x`echo "obase=16;$un"|bc`

if [ -z "$sd" ] ; then exit 1; fi

if [ -z "$ks" ] ; then exit 1; fi

if [ -z "$kh" ] ; then exit 1; fi

if [ -z "$kt" ] ; then exit 1; fi

if [ $sh -eq 1 ]; then
   echo Resetting Hard Error
   echo $kh/W 0 | mdb -kw
fi
if [ $ss -eq 1 ];then
   echo Resetting Soft Error
   echo $ks/W 0 | mdb -kw
fi
if [ $st -eq 1 ]; then
   echo Resetting Tran Error
   echo $kt/W 0 | mdb -kw
fi
exit 0

--
Dr.Udo Grabowski  Inst.of Meteorology & Climate Research IMKASF-SAT
https://www.imk-asf.kit.edu/english/sat.php
KIT - Karlsruhe Institute of Technology          https://www.kit.edu
Postfach 3640,76021 Karlsruhe,Germany T:(+49)721 608-26026 F:-926026

un=`ksh93 -c 'paste -d= <(iostat -e|nawk '\''NR>2{print $1}'\'') <(iostat -en|nawk '\''NR>2{print $5}'\'')|grep '$dev'|cut -f1 -d=|cut -c3-'` ha=`echo "$ks::print -a struct sd_errstats sd_harderrs.value.ui32" | mdb -k | cut -d" " -f1` ha=`echo "$ks::print -a struct sd_errstats sd_softerrs.value.ui32" | mdb -k | cut -d" " -f1` ha=`echo "$ks::print -a struct sd_errstats sd_transerrs.value.ui32" | mdb -k | cut -d" " -f1` un=`ksh93 -c 'paste -d= <(iostat -e|nawk '\''NR>2{print $1}'\'') <(iostat -en|nawk '\''NR>2{print $5}'\'')|grep '$dev'|cut -f1 -d=|cut -c7-'` sd=`echo "bd_state::print bd_t d_private |::softstate $lun |::print bd_t d_errstats |::print kstat_t ks_data" | mdb -k | cut -d" " -f3` ks=`echo "$sd::print -a nvme_device_stat_t nds_dma_bind_err.value.ui32" | mdb -k | cut -d" " -f1` kh=`echo "$sd::print -a nvme_device_stat_t nds_abort_timeout.value.ui32"| mdb -k | cut -d" " -f1` kt=`echo "$sd::print -a nvme_device_stat_t nds_abort_failed.value.ui32" | mdb -k | cut -d" " -f1`

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