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How to get rid of WRITE SAME failed?

How to get rid of the message “WRITE SAME failed. Manually zeroing.”?

On my fedora system running kernel 3.11.4-201.fc19.x86_64 we see lots of messages in the syslog file like:

kernel: dm-1: WRITE SAME failed. Manually zeroing.

This has to do with SMART capabilities as we can see with the command:

$ sudo smartctl -i /dev/sda | grep SMART
SMART support is:     Unavailable - device lacks SMART capability.

Fine, how can we disbale it then? Execute the following set of commands:

$ find /sys | grep max_write_same_blocks

Now, add this device into a new tmpfile configuration file (which will be picked up by systemd). For details check tmpfiles.d(5). Create a file (must ending with “.conf”) in /etc/tmpfiles.d/:

$ sudo cat > /etc/tmpfiles.d/write_same.conf <<EOD
# Type Path        Mode UID  GID  Age Argument
w /sys/devices/pci0000:00/0000:00:10.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0/max_write_same_blocks  -   -   -   -  0

The next time your computer restart the message should go away. Keep fingers crossed.

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