[linux-lvm] Re: can I freeze I/O for some time to a given disk / md / dm device?

Tomasz Chmielewski mangoo at wpkg.org
Tue Dec 16 16:19:21 UTC 2008

Gabor Gombas schrieb:
> 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.

Thanks, I think I have enough hints now.

Bryn M. Reeves on linux-lvm list suggested using dmsetup's 
suspend/resume, which seems to be the easiest way for this purpose 
(requires device mapper / LVM).

Tomasz Chmielewski
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