NFS problems in failover – MC Service Guard. Applicable to other Linux HA clusters

Problem: Two Linux servers (RHEL4) running NFS Server in High-Availability (failover) mode. When failovering the resources, an NFS client can continue to work. When failing back, the NFS client times-out for 5+ minutes. Further problem information: While using RHEL3, that same (exact) configuration worked flawlessly. Solution: set NFS options to UDP instead of TCP. Explanation:…

Why I don’t like GRUB – RHEL4 on system with local and external storage

Installed RHEL4 on a system with both internal storage (HP SmartAray 5i – cciss) and external disks through Qlogic FCS HBA. During install, the local disks were detected as /dev/cciss/c0d0 while the external disks were detected as /dev/sda and /dev/sdb After installation was done, Grub started with incorrect mapping. For no apparent reason, Grub searched…