From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kip Macy Subject: Re: Unstableness in grant table block drivers Date: Wed, 13 Apr 2005 18:53:44 -0700 Message-ID: References: <1113441492.13301.9.camel@localhost> Reply-To: Kip Macy Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Steven Hand Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org > Sure, good point (though as mentioned above, we hadn't seen any > problems ourselves -- we strongly appreciate the community effort > in helping us ensure new changes work on a broad range of configs > and usage scenarios). I think it is safe to say that the blkback/blkfront still have some serious bugs to be fixed even in the absences of grant tables. Exporting more than a couple of block devices to VMs will eventually cause domUs to stop receiving block I/O. I hope to have time to create a scenario that works quicktly and with a sufficiently small configuration that you'll be able to reproduce it there. To date I've only tried it with a fairly large number of LUNs. Developers using xen here periodically have to re-boot their machines as a result. They can't reproduce it consistently (thankfully), but they're typically only using 7-10 VBDs. -Kip