From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anand Jain Subject: Re: device failure hangs the system Date: Fri, 01 Jul 2011 17:42:33 +0800 Message-ID: <4E0D9689.6040700@oracle.com> References: <4E0D929E.7030704@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed To: linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <4E0D929E.7030704@oracle.com> List-ID: Looks like there is a panic (not system hang). any idea where is the panic log after the system has been power-recycled. (its not in the /var/log/messages or dmesg or /var/crash is empty) Thanks, Anand On 07/01/2011 05:25 PM, Anand Jain wrote: > > hi, > > Following test case causes my remote system to hard-hang and does > not respond to any key strokes. > > ----------- > # btrfs fi show > failed to read /dev/sr0 > Label: none uuid: 75ad3c9f-f661-498e-8c13-89d4e4c58312 > Total devices 3 FS bytes used 28.00KB > devid 1 size 465.76GB used 2.02GB path /dev/sdb > devid 3 size 465.76GB used 2.01GB path /dev/sdd > devid 2 size 465.76GB used 1.01GB path /dev/sdc > > Btrfs v0.19-35-g1b444cd > ------------ > > > Stopping the disk > ------------ > # echo 1 > /sys/block/sdd/device/delete > ------------ > ------------ > # dmesg | tail > sd 3:0:0:0: [sdd] Stopping disk > :: > # > ------------ > > ------------ > # btrfs fi show > failed to read /dev/sr0 > Label: none uuid: 75ad3c9f-f661-498e-8c13-89d4e4c58312 > Total devices 3 FS bytes used 28.00KB > devid 1 size 465.76GB used 2.02GB path /dev/sdb > devid 2 size 465.76GB used 1.01GB path /dev/sdc > *** Some devices missing > > Btrfs v0.19-35-g1b444cd > ------------ > > and the following command hangs the system. > ------------- > # btrfs fi balance /btrfs > ------------- > > Any idea if this is an known issue ? OR if there is any better way > to fail a disk (or a loop disk) for testing. > > (something similar to cfgadm -c unconfigure in solaris). > > Thanks > -Anand >