Hello, One of our XEN slave server became freezed and only a reboot could make it up. On checking the server''s /var/log/messages, we could find the following: =============== Nov 20 18:16:46 s433 kernel: s:0: rejecting I/O to offline device Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device Nov 20 18:16:46 s433 last message repeated 85 times Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: re:0: rejecting I/O to offline device Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device ================= Can you please shed some light on this? Now the server is working fine with out any issues. But we need to know whether this is caused due to any h\w issues such as RAID or is this any know bug in XEN. The server is having the OS "CentOS 5.2 x86_64". Thanks, CPTECH _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi, On Sat, 2008-11-22 at 07:18 +0530, tech@crucialparadigm.com wrote:> Hello, > > One of our XEN slave server became freezed and only a reboot could make it > up. On checking the server''s /var/log/messages, we could find the following: > > ===============> > Nov 20 18:16:46 s433 kernel: s:0: rejecting I/O to offline device > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device > > Nov 20 18:16:46 s433 last message repeated 85 times > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: re:0: rejecting I/O to offline device > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device > > =================It looks like something backing a vbd vanished sometime after the guest started .. perhaps a problem with a SAN (or a degraded RAID) ? There should be more in your xen logs to help figure this out. Are you running HVM or PV guests? Cheers, --Tim _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
tech@crucialparadigm.com
2008-Nov-22 03:15 UTC
Re: [Xen-users] Issue with XEN slave server
Hi Tim, Thanks. We are running HyperVM. We also checked the status of the raid using 3ware command line utility and the result is fine. --------------------------------------------------------------------->info c0Unit UnitType Status %RCmpl %V/I/M Stripe Size(GB) Cache AVrfy ------------------------------------------------------------------------------ u0 RAID-1 OK - - - 372.519 OFF OFF Port Status Unit Size Blocks Serial --------------------------------------------------------------- p0 OK u0 372.61 GB 781422768 WD-WCAS86080105 p1 OK u0 372.61 GB 781422768 WD-WCAS86314512 --------------------------------------------------------------------- Thanks, CPTECH On Saturday 22 November 2008 07:44, Tim Post wrote:> Hi, > > On Sat, 2008-11-22 at 07:18 +0530, tech@crucialparadigm.com wrote: > > Hello, > > > > One of our XEN slave server became freezed and only a reboot could make > > it up. On checking the server''s /var/log/messages, we could find the > > following: > > > > ===============> > > > Nov 20 18:16:46 s433 kernel: s:0: rejecting I/O to offline device > > > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device > > > > Nov 20 18:16:46 s433 last message repeated 85 times > > > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: re:0: rejecting I/O to offline > > device > > > > Nov 20 18:16:46 s433 kernel: sd 1:0:0:0: rejecting I/O to offline device > > > > =================> > It looks like something backing a vbd vanished sometime after the guest > started .. perhaps a problem with a SAN (or a degraded RAID) ? > > There should be more in your xen logs to help figure this out. Are you > running HVM or PV guests? > > Cheers, > --Tim_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hi, On Sat, 2008-11-22 at 08:45 +0530, tech@crucialparadigm.com wrote:> Hi Tim, > > Thanks. We are running HyperVM. We also checked the status of the raid using > 3ware command line utility and the result is fine. > > --------------------------------------------------------------------- > >info c0 > > Unit UnitType Status %RCmpl %V/I/M Stripe Size(GB) Cache AVrfy > ------------------------------------------------------------------------------ > u0 RAID-1 OK - - - 372.519 OFF OFF > > Port Status Unit Size Blocks Serial > --------------------------------------------------------------- > p0 OK u0 372.61 GB 781422768 WD-WCAS86080105 > p1 OK u0 372.61 GB 781422768 WD-WCAS86314512 > > ---------------------------------------------------------------------As I noted, the error seems to indicate that something backing a virtual block device vanished after a guest was started. Are you using LVM or file backed images? Is there anything at all in the Xen logs from around the same time stamp as the entries in messages that you posted? Also, again, are the guests PV or HVM? I don''t use HyperVM so I''m not sure what it supports. Cheers, --Tim _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users