Ansgar, First of all, sorry for not replying earlier, it has been a busy day.
If you do not mind, I still need more details about your exact situation. First of all, i know for sure that if your system has SATA drives and if you use the default SystemImager kernel to image the compute nodes, you will most certainly have issues; and again, this is mainly due to the fact that the kernel used for imaging and the one used by CentOS, do not name the SATA drives to same way. As a result, the imaging process is successful (SATA drives are recognized as SCSI disks and the system is setup accordingly) but when you reboot the compute nodes, the kernel (old version) actually recognizes the SATA drives as IDE and therefore cannot boot (the system configuration does not fit the configuration). So typically can you answer the following questions: - Are the two kernels (OSCAR headnode and images) exactly the same, or are they slightly different (i know you already gave me this information, i just want to double-check that we are on the same page). - CentOS is using a 2.6.18.x kernel and SystemImager a newer kernel; did you use UYOK in order to use a more CentOS-like kernel for compute node deployment? Sorry if i make you repeat what you may have already said, i try to clarify the details so we could try to identify the exact problem together and fix it. Regards, ----- Mail Original ----- De: "Ansgar Esztermann" <aesz...@gwdg.de> À: oscar-users@lists.sourceforge.net Envoyé: Mercredi 29 Avril 2009 06h00:43 GMT -05:00 USA/Canada - États de l'Est Objet: Re: [Oscar-users] 6.0.2, 6.0.3 and broken initrd Geoffroy, On Apr 28, 2009, at 17:24 , geoffroy.val...@free.fr wrote: > Sorry but i cannot help you. You do not give me enough details, keep > continue to say that OSCAR is broken even when i give you other > points to investigate. Sorry i cannot do more based on the > information i have and again, __ALL__ I am sorry if I did give that impression -- I do not claim that OSCAR is broken; I am merely maintaining that the initrd created by the kernel rpm is broken. As far as I understand, OSCAR or SIS are supposed to create a new initrd. For some reason, this does not work correctly with my machine. I would like to find out why and fix the problem, but so far have been unable to. Is there documentation available that explains how OSCAR works? I do know that an image is created, and SystemImager is used to install it to the compute nodes; but inbetween, it gets somewhat sketchy. For example, how and where exactly is the new initrd created? I have taken a look at various scripts, and it seems that an initrd is created after rsync'ing the image to the node only if no initrd exists in the image (but it does on my installation). Surely I am overlooking something. > users how had similar issues (and i know about), the problem was > because the kernel in the image is 2.6.18 based whereas the > SystemImager kernel to image the node is > 2.6.19 (SATA naming issue > and so on -- remember that selecting the SCSI template when creating > the nodes may not be enough), or because the kernel shipped with > RHEL was not working correctly on their platforms. Well, the kernel does work on my compute nodes if I manually create the initrd; there may be some hidden conflict due to the 2.6.18/2.6.19 conflict although I do not see how this would silently prevent an initrd from being generated. > PS: for the kernel difference between the headnode and the compute > nodes, we use online repositories for both of them. This is not an > OSCAR issue, we do not enforce the version. So most certainly your > headnode is not up-to-date or not using the same repositories, one > of them being out-of-date. OK, thank you for the suggestion. I have made sure the headnode has the latest CentOS kernel. A new image is being created, and I will report back to the list. Regards, A. -- Ansgar Esztermann DV-Systemadministration Max-Planck-Institut für biophysikalische Chemie, Abteilung 105 ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Oscar-users mailing list Oscar-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/oscar-users ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Oscar-users mailing list Oscar-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/oscar-users
