1 ) We have a SAP Ides system installed on Red Hat Linux 5.3 & db2 in which the OS crashed & the OS administration team Re installed Linux by formatting / ( root ) & /boot directory but did not touch other directories like /usr , /sapmnt , /opt etc . Now is it possible to some how bring up SAP by using old files ( we have taking file system backup of old / & /boot directory ) . I tried to start SAP but found out that SIDADM user is not available since the OS was re installled ?
2) The network team wants to change the IP Adress of some SAP systems . Now what is the impact of changing the ip adress , gateway , subnet mask of already installed SAP system ? What are the pre cautions to be taken before going for these changes ?