From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id jBMHDm128131 for ; Thu, 22 Dec 2005 12:13:48 -0500 Received: from eastrmmtao04.cox.net (eastrmmtao04.cox.net [68.230.240.35]) by mx1.redhat.com (8.12.11/8.12.11) with ESMTP id jBMHDgi0013980 for ; Thu, 22 Dec 2005 12:13:42 -0500 Received: from [192.168.0.9] (really [70.179.95.46]) by eastrmmtao04.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20051222171056.WDJF19943.eastrmmtao04.cox.net@[192.168.0.9]> for ; Thu, 22 Dec 2005 12:10:56 -0500 Message-ID: <43AADECD.7010106@cox.net> Date: Thu, 22 Dec 2005 12:13:49 -0500 From: Old Fart MIME-Version: 1.0 Subject: Re: [linux-lvm] more info on the hang with 2.6.15-rc5 References: In-Reply-To: Content-Transfer-Encoding: 7bit Reply-To: rascal.jumper-747@cox.net.spamorama.redhat.com, LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development Sebastian Kuzminsky wrote: > Now it works, but I dont trust it one bit. > > I had been seeing almost immediate, perfectly repeatable hard lockups > in 2.6.15-rc5 and 2.6.15-rc5-mm3, when using sata_mv, RAID, and LVM > together. Nothing in the syslog or on the console, and the system is > totally unresponsive to the keyboard & network. > > My hardware setup is: four Seagate Barracuda 500 GB disks, on a Marvell > MV88SX6081 8-port SATA-II PCI-X controller, on a PCI-X bus (64/66). > > The disks work great when accessed directly. They work great when used > as four PVs for LVM, and when assembled into a 4-disk RAID-6. > > But when I make a RAID-6 array out of them, and use the array as a PV, > the system would hang completely, within seconds. (This is with LVM > 2.02.01, libdevicemapper 1.02.02, and dm-driver 4.5.0.) > > I turned on all the debugging options in the kernel config hoping to get > some insight, but this "debug" kernel doesnt crash. It's running fine, > and I'm pounding on it. A timing problem in the interaction between > LVM and RAID? Some kind of wierd heisenbug.... > > > I'd be happy to do any debugging tests people suggest. > > > This won't be much help, but, there are some indications of a kernel problem with raid. The problems may be fedora specific, but, currently fedora rawhide is following the upstream kernel. See: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=176179 good luck. -- Regards, Old Fart