From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: can I freeze I/O for some time to a given disk / md / dm device? Date: Tue, 16 Dec 2008 13:01:27 +0100 Message-ID: <49479897.1080500@wpkg.org> Reply-To: LVM general discussion and development Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-lvm-bounces@redhat.com Errors-To: linux-lvm-bounces@redhat.com To: Linux IDE , Linux-Raid , LVM general discussion and development List-Id: linux-raid.ids 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? If not, is it possible to reset a link repeatedly, like ATA does when it hits certain disk problems? I.e., can I do the below manually? ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen ata4.00: cmd 25/00:08:b8:c2:78/00:00:21:00:00/e0 tag 0 dma 4096 in res 40/00:00:bb:c2:78/40:00:21:00:00/e0 Emask 0x4 (timeout) ata4.00: status: { DRDY } ata4: hard resetting link I need this to trace a problem with a userspace application which segfaults when ATA resets the link repeatedly (i.e. one broken drive in a RAID array). -- Tomasz Chmielewski http://wpkg.org _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/