Re: SLES10 SP2 X64 LVM iSCSI problem

LVM and iSCSI are not configured (aliogned) properly in SLES10. I did it in SLES9 SP4 (it required 4 changes),
and I tested SLES10 iscsi few times and found it very difficult to use because of all this mess:
- LVM don't see iscsi disks;
- hot plug function which replaced _netdev mount dont see iscsi disks properly (not in all cases)
- if you use multipath and then lvm and iscsi upfront, it became very difficult to undersatand which LVM disk is where.

I recommend to do a simple hack:
- copy netmount service (don't remember exact name) from SLES9 SP2 into the SLES10 (it is service which mounted _netdev disks);
- make this service dependent on iSCSI service
- remove parallel rc mode (somewhere in sysconfigs) - so that services are runned sequentially and not in parallel (default is parallel)
- in netmount service, add 60 seconds pause, then run /etc/init.d/boot.lvm startup, then run _netdev mounts.
- it may help (through hacking iscsi startup can eb better option, if novell do it).

It's really a big shame for Novell. Even RedHat have iSCSI and lvm aligned much better then SLES10.

  ----- Original Message ----- 
  From: [email protected] 
  To: Shashi Kanth Boddula 
  Cc: [email protected] ; [email protected] 
  Sent: Thursday, November 27, 2008 3:31 AM
  Subject: Re: [suse-sles-e] SLES10 SP2 X64 LVM iSCSI problem



  Try vgscan after reboot, and after that execute an lvscan if you have logical volumes in this vg. 

  Herman 

  [email protected] escribió el 27/11/2008 07:59:41:

  > One of my box is installed with SLES10 SP2 X64. The box is having only
  > one 9GB disk.
  > 
  > 
  > The partition looks like bellow.
  > 
  > 
  > /dev/cciss/c0d0p1 Linux -> Mounted as /boot (100 MB)
  > 
  > /dev/cciss/c0d0p2 Linux LVM -> The partition is having 2 LVs(root_lvol,
  > and swap_lvol) and the VG name is "system". These 2 LVs occupied entire
  > space from the VG.
  > 
  > 
  > I have exposed one iSCSI LUN from another SLES10 SP2 box to this box,
  > and i have added that iSCSI device to "system" VG.
  > 
  > 
  > After adding, when i rebooted the box, when the box is booting, the box
  > keep on throwing the messages like bellow.
  > 
  > 
  > Couldn't find device with UUID 'XXXXXXXXXX'
  > Couldn't find all physical volumes for volume group 'system'
  > volume group "system" not found.
  > 
  > 
  > I understood that iSCSI device is the cause for this problem.
  > 
  > 
  > Anyone give some hint, how can i overcome this problem, how can i boot
  > the box ?
  > 
  > 
  > Thank you.
  > 
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