example1: Normal VG mkvg -s 16 -t 2 -y datavg hdisk4 (partition size is 16. Factor(t) is 2. 1016 x 2= 2032 ( that means this volumegroup can have up to 16 disk. see table example2: Big VG mkvg -B -t 16 -y […]
Tagged AIX, disk, Volume Groupeach filesystem hast two superblock. one in logical block 1 and copy in logical block 31. We can copy supberblock fro block 31 to block1 for the root file system here is the command: dd count=1 bs=4k skip=31 seek=1 if=/dev/hd4 of=/dev/hd4
Tagged AIX, superblockGuidelines for MaxMem Don’t set MaxMem equal to total amount of server memory for each LPAR. This will waste memory with oversized HPTs. Size MaxMem approximately 25 percent larger than Desired Memory for production LPARs that might require a DLPAR memory addition. For less important LPARs, which could be shutdown for a desired memory increase, […]
Tagged AIX, LPAR, Memorywe can boot AIX in maintenance mode -> access rootvolume group-> Access this Volume Group and start a shell before mounting file systems # logform -V jfs /dev/hd8 # fsck -y -V jfs /dev/hd1 # fsck -y -V jfs /dev/hd2 # fsck -y -V jfs /dev/hd3 # fsck -y -V jfs /dev/hd4 # fsck -y […]
Tagged AIX, maintenanceboot the system in maintenance mode -> Access to the root Volume Group # bosboot -ad /dev/hdiskX (rebuild hd5) # Shutdown -Fr ( important !! All changes need to be written from memory to disk.) The bosboot command requires that boot logical volume (hd5) exists. If we lose the Boot logical Volume (BLV) then we […]
Tagged AIX, boot