Hello Mark, I'll have to look into the flashcopy process but have not taken the time for it just yet.
I guess one thing that would be wrong then is that I copy from the live system. So the source nlzlx920 is being copied from within the nlzlx920. But would that introduce IO errors on the target disks? If anything I'd expect to see errors during boot of the target guest. Either in a filesystemcheck or dmesg afterwards. Much like when you DDR a live VM and get a warmstartdata error when the target is IPLled. Perhaps a rethink of the process is in order. I guess a resque system would be an option. I do like to have a resque machine so I could also use that machine to do the cloning. As for other questions, I also assume I have the rights. No errors on that part. Same amount of cylinders. I have not yet ran the fsck on the source nor did I test it in a failsafe IPL of a new target. I dd with "dd bs=4096 if=$sDev of=$tDev" no other options. Haven't ran dd during the process by hand, other than a manual test to clone the first machine and to test the steps in the script. No erep or errors within the operator log. There is no error from the VM part. It's only within the linux. Regards, Berry. -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Mark Perry Sent: donderdag 21 augustus 2008 12:22 To: LINUX-390@VM.MARIST.EDU Subject: Re: Root filesystem error switches to ReadOnly van Sleeuwen, Berry wrote: > Hello Mark, > > I meant fast in a way that the / is copied and then changes the hostname and > IP address. No other fancy things, just a default environment for our support > staff to play around with. > > The cloning process is loosly based on the cloning scripts from redp4322. The > dasd is copied using DASDFMT and dd. Both source (installation machine) and > targets are identical, other than the obvious different location of the > minidisk extents. The / is a 3338 cylinder minidisk so there it even uses the > same minidisk extents but on different DASD volumes. There is one thing I now > see, I first regarded as an error due to new disks, but it is still present > even when the disks were in use for the guest before. When the copy is done > there are some IO errors. > FLASHCOPY is still faster ;-) > 08/08/19 13:41:20 NLZLX920 VMLXES21: end_request: I/O error, dev dasdd, > sector 361776Ÿprintk: 630 messages suppressed.ŸBuffer I/O > 08/08/19 13:41:20 NLZLX920 VMLXES21 error on device dasdd, logical block > 45222Ÿlost page write due to I/O error on dasddŸBuffer > 08/08/19 13:41:20 NLZLX920 VMLXES21 I/O error on device dasdd, logical bl > > The disk is linked, then DASDFMT and dd. It looks like the IO errors appear > within the dd part of the copy process. But how to fix that? Should the guest > have some mdisk option to avoid errors? > > Thanks, Berry. > If doing a dd from linux and the minidisks are identical in size, then one must assume that you have the rights to write to all cylinders. If you issue a vmcp q v da - are source and target the same number of cylinders? I also assume that the source and target are not mounted to Linux while the dd is running? Have you done an fsck on the source volume to ensure it is good? Are you specifying any dd options? Can you do a foreground dd (with -v) and reproduce the error? Is z/VM logging anything - EREP? mark ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
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