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Summary:
The Linux driver for Micron drives contains an internal parameter that disables support for iostat and Micron drives thus do not show up on iostat. To re-enable iostat, following steps are required.
Resolution:
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Download the latest support pack. The driver name is mtip32xx. Run the following to determine the name of the driver (reference as <driver_name> in the instructions below).
$ lsmod | grep mti* -
Log in as root. Root access is required. If you do not have root access, enable access by the following: a) Enter the following command:
$ /lib/modules/`uname -r`/extra/<driver_name>/<driver_name>.kob) Run the following to adjust write permissions.
$ chmod 777<driver_name>.ko -
Install the latest Linux driver from the support pack following the standard instructions. After installation, follow these steps: a) Verify the driver name following step 1 in this section. b) Run the following and confirm the output
$ fdisk -| // output should be /dev/rssda -
Uninstall the driver and reinstall the driver with stats flag enabled: a) Enter the following command:
$ modprobe -r <driver_name>b) And then this
$ insmod /lib/modules/`uname-r`/extra/<driver_name>/<driver_name>.ko stats=1 -
Run som I/O on the drive using any I/O stress took such as FIO or Vdbench. During this time, run one of the following commands.
$ cat /proc/diskstator
$ cat /sys/block/rssda/stat -
Verify the diskstat counts for rssd or stat output are being populated.