$ cat /proc/meminfo | grep -e "^Mem" MemTotal: 8142012 kB MemFree: 7204048 kB MemAvailable: 7672148 kB #!/bin/sh while [ 1 ]; do sg_inq /dev/sdf sleep 2 done $ sh send_sg_inq.sh $ sudo dd if=/dev/zero of=/dev/sdf1 bs=1M :$ sudo scsi_logging_level -g Current scsi logging level: /proc/sys/dev/scsi/logging_level = 0 SCSI_LOG_ERROR=0 SCSI_LOG_TIMEOUT=0 SCSI_LOG_SCAN=0 SCSI_LOG_MLQUEUE=0 SCSI_LOG_MLCOMPLETE=0 SCSI_LOG_LLQUEUE=0 SCSI_LOG_LLCOMPLETE=0 SCSI_LOG_HLQUEUE=0 SCSI_LOG_HLCOMPLETE=0 SCSI_LOG_IOCTL=0 $ sudo scsi_logging_level -s -E 7 -L 7 -M 7 New scsi logging level: /proc/sys/dev/scsi/logging_level = 2096647 SCSI_LOG_ERROR=7 SCSI_LOG_TIMEOUT=0 SCSI_LOG_SCAN=0 SCSI_LOG_MLQUEUE=7 SCSI_LOG_MLCOMPLETE=7 SCSI_LOG_LLQUEUE=7 SCSI_LOG_LLCOMPLETE=7 SCSI_LOG_HLQUEUE=0 SCSI_LOG_HLCOMPLETE=0 SCSI_LOG_IOCTL=0 $ sudo scsi_logging_level -s -E 0 -L 0 -M 0 New scsi logging level: /proc/sys/dev/scsi/logging_level = 7 SCSI_LOG_ERROR=7 SCSI_LOG_TIMEOUT=0 SCSI_LOG_SCAN=0 SCSI_LOG_MLQUEUE=0 SCSI_LOG_MLCOMPLETE=0 SCSI_LOG_LLQUEUE=0 SCSI_LOG_LLCOMPLETE=0 SCSI_LOG_HLQUEUE=0 SCSI_LOG_HLCOMPLETE=0 SCSI_LOG_IOCTL=0 $ tar xJf perf-5.9.0.tar.xz $ cd perf-5.9.0/tools/perf/ $ sudo fio --bs=1K --ioengine=libaio --iodepth=32 --size=10g --direct=0 --runtime=60 --filename=/dev/sdf --rw=randread --numjobs=1 --name=test $ sudo ./perf record -a -g -- sleep 30 [ perf record: Woken up 8 times to write data ] [ perf record: Captured and wrote 2.476 MB perf.data (12373 samples) ] $ sudo ./perf script > out.script $ sudo ./perf report > out.report $ ls out.* out.report out.script