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

From: Tomasz Chmielewski <mangoo wpkg org>
To: Gabor Gombas <gombasg sztaki hu>
Cc: Linux-Raid <linux-raid vger kernel org>, Linux IDE <linux-ide vger kernel org>, LVM general discussion and development <linux-lvm redhat com>
Subject: [linux-lvm] Re: can I freeze I/O for some time to a given disk / md / dm device?
Date: Tue, 16 Dec 2008 17:19:21 +0100

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 / dmdevice?
Say, "freeze I/O" so that userspace waits for any response for 30, 60seconds 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'ssuspend/resume, which seems to be the easiest way for this purpose(requires device mapper / LVM).



--
Tomasz Chmielewski
http://wpkg.org

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

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