You can run into an issue with EMC storage on AIX systems using MPIO (No Powerpath) for your boot disks: After installing the ODM_DEFINITONS of EMC Symmetrix on your client system, the system won’t boot any more and will hang with LED 554 (unable to find boot disk). The boot hang (LED 554) is not …
Increase rootvg dynamically If your rootvg “disk” is actually virtual, such as a SAN LUN or a logical volume on the VIO server, then it usually can be expanded on the SAN (or using extendlv on the VIOS) and then recognised on the AIX LPAR using the -g flag of the chvg command: chvg -g rootvg Note: this is supported …
Aix : Grow / expand your rootvg on the fly (from 6.1 TL 4) Read More »
Installing server firmware fixes through the operating system is a disruptive process. You will need to restart the system. Notes: If your system is managed by an HMC, you must apply server firmware through the HMC. For details, see Managed system updates in Updates. If you have a System i® model running IBM® i, you …
How to Upgrade IBM Power server firmware fixes through AIX or Linux without an HMC Read More »
You can install a firmware fix permanently by using either the flash command or the AIX diagnostic service aids. Note: To perform this task, you must meet the following criteria: You must have root user authority. You must start your server from the temporary side. For details, see Working with the temporary and permanent side …
Using AIX commands to install a firmware fix permanently Read More »
LUNz is the logical unit number that an application client uses to communicate with, configure and determine information about an SCSI storage array and the logical units attached to it. The LUN_Z value shall be zero. LUNz has been implemented on CLARiiON arrays to make arrays visible to the host OS and PowerPath when no …
Memory Memory Leak: Caused by a program that repeatedly allocates memory without freeing it. When a process exits, its working storage is freed up immediately and its associated memory frames are put back on the free list. However any files the process may have opened can stay in memory. AIX tries to use the maximum …
SDD is designed to support the multipath configuration in the ESS. The software used to balance ESS I/O traffic across all adapters. It provides multiple access to data from the host. when using sdd cfgmgr is run 3 times (cfgmgr -l fcs0, cfgmgr -l fcs1, cfgmgr (the third one builds the vpaths)) 3 policies exist …
Encrypting Filesystem on AIX 6.1. EFS offers 2 modes of operation: Root Admin mode This is the default mode. Root can reset user and group keystore passwords. Root Guard mode Root does not have access to user’s encrypted files and cannot change their passwords. Note: NFS exports of EFS filesystems are not supported. 1. Prerequisites: …
To show the current paging space volume, its size along with other information use the ‘lsps’ command: # lsps -a Page Space Physical Volume Volume Group Size %Used Active Auto Type Chksum hd6 hdisk1 rootvg 512MB 2 yes yes lv 0 The paging space may be increased on the fly using the ‘chps’ command. In …
How to Increase paging space logical volume size in AIX ? Read More »
Memory and Paging Disk I/O Issues CPU Scheduling and Process Priorities Oracle Real Application Clusters Information Setting the AIXTHREAD_SCOPE Environment Variable Memory and Paging Memory contention occurs when processes require more memory than is available. To cope with the shortage, the system pages programs and data between memory and disks. Controlling Buffer-Cache Paging Activity Excessive …