On Tue, Dec 16, 2008 at 01:01:27PM +0100, Tomasz Chmielewski wrote:
Is it possible to "freeze I/O" for some time to a given disk / md / dm
device?
Say, "freeze I/O" so that userspace waits for any response for 30, 60
seconds or more?
For real disks you can use /sys/block/sdX/device/unload_heads to achieve
something similar (see Documentation/laptops/disk-shock-protection.txt
in the kernel source about how to use it). That won't work for md/dm
devices though.
For drives which don't support "unload_heads" plain hdparm should work:
hdparm -Y /dev/sdX
(possibly repeated in a loop for some time).
--
Tomasz Chmielewski
http://wpkg.org
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