On Thu, 3 Dec 2015, brad wrote:

> It seems to be permanent?   After reboot I still have this and I can 
> mount the drive
> 
> dt1:cat /sys/block/sdb/device/scsi_disk/4\:0\:0\:0/cache_type
> write through

I don't understand.  The change you make by writing to the sysfs file 
is not permanent.  It will reset on every reboot and also every time 
you unplug and replug the drive.

Alan Stern

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