Memory

• bootinfo –r shows how much RAM does my machine has (as root)
• lsattr –E –l sys0 –a realmem shows how much RAM does my machine have (as non root)
• rmss -c 512 sets the memory size to 512 MB
• rmss -r resets the memory size to the original one

Devices

• powermt display lists errors etc for fibre cards
• lsattr -El en0 displays en0 driver params
• lsattr -El ent0 displays ent0 HW params
• lsattr -El rmt0 displays tape params
• lscfg -vp -l rmt0 all information about a tape drive
• lsattr -El sys0 displays system type, firmware, etc driver params
• lscfg –v lists all system HW config (NVRAM)
• lsdev –Csscsi list all scsi devices
• lsdev –Cspci list all pci devices
• lsparent –Ck scsi list all scsi adapters
• lsdevfc list fiberchannel devices
• cfgmgr Configures devices
• lsdev -Ccdisk Shows all disks
• lsdev -Cctape Shows all tapes
• cfgmgr -v -l device –v Specifies verbose output. The cfgmgr command writes information about what it is doing to standard output.
• cfgmgr -v -l device Name Specifies the named device to configure along with its children. If you only turned on a disk tower at e.g. scsi2 cfgmgr -v -l scsi2 will only configure this with detailed output.
• lsdisp To check which graphic adapter is installed.
• lscfg -vp -l mga0 (all information about a adapter)
• lscfg -vp -l hdisk0 | grep Machine gives info about the disk manufacture type
• lsslot -c pci For 6F1 only !!!! Lists all slots ,voltage,boards,etc !!!!
• bootlist -m normal cd0 rmt0 hdisk0 Changes the default bootlist
• lsmcode -c display the system firmware level and service processor
• lsmcode -r -d scraid0 display the adapter microcode levels for a RAID adapter scraid0
• lsmcode -A display the microcode level for all supported devices

System info

• /usr/bin/uname -m Get machine ID
• /usr/bin/uname -M Get platform type
• oslevel Displays current AIX level
• oslevel -r Displays current AIX maintenance level
• oslevel -g List filesets at levels later than maintenance level !!!
• lsps -a Paging space settings
• lscfg -vp -l proc0 (1,2,3) (all information about a processor[s])
• lscfg -vp -l mem0 |pg all information about memory modules installed
• env ulimit Environment settings – show user ulimit
• bootinfo –s hdisk0 Displays disk size
• lsattr -El sys0 -a systemid Determines the system serial number
• lscfg –vp|grep ROM|grep -v CD Determines the system Firmware level

System issues

• TERM=vt100 Run this if you execute a command/application and it responds with message ‘The type of your terminal is unknown to the system’. In ‘ksh’ and tcsh set term=vt100
• dd if=/dev/fd0 of=/tmp/diskimage bs=4096 Duplicate a diskette copy from diskette to hard drive
• dd if=/tmp/diskimage of=/dev/fd0 bs=4096 copy diskette image onto diskette
• /usr/lpp/X11/bin/xset -display unix 0 s off Kill display timeout
• lsfs -v jfs List of Filesystem items.
• lsfs -q -v jfs You can see also the parameter of a filesystem and thus see if e.g. /backup was or is a big_filesystem_enabled one. Important for the 2GB File limit.
• lsuser –f root Shows all user parameters (max .file size,etc)
• sysdumpdev -L Check last system dump status
• sysdumpdev -l Check system dump device settings
• lslpp -f Upd_Timna_DTM.obj List contents of package

Networking

• netstat -i displays network interfaces setting
• mktcpip -S en0 dumps all TCPIP information for the interface in compact format
• showmount –e displays all exported volumes
• showmount -a show who’s got my filesystemsses mounted over IP
• lssrc –g tcpip displays all IP oriented processes status
• entstat -drt ent0 |grep –i error display any communication errors on ent0
• entstat -r Resets all the statistics back to their initial values.
• arp -a shows a local arp cache
• netstat -ptcp shows IP statistics
• netstat -pudp shows UDP statistics
• netstat -I en0 10 Trace en0 every 10 seconds
• netstat -rn Display routing info with IP address
• netstat -in Shows the state of all configured interfaces
• netstat -r Display routing info with full hostnames
• nfsstat –z Reset NFS stats without reboot
• mount hostname:/filesystem /mount-point Mount an NFS filesystem
• mknfsexp -d /directory Creates an NFS export directory
• mknfsmnt Creates an NFS mount directory
• rmnfs Stops and un-configures NFS services
• mknfs Configures and starts NFS services
• exportfs Lists all exported filesystems
• exportfs -a Exports all fs’s in /etc/exports file
• exportfs -u filesystem Un-exports a filesystem

Disks

• synclvodm -vP vgname synchronizes ODM and the disk VG info.
• redefinevg vgname Redefine VG definition in ODM to resync LVM and ODM definitions
• lqueryvg -p hdisk0 –Avt Reads logical volumes info from disk
• bootinfo -s hdisk0 Shows Megabytes available even if no volume group is assigned.
• lspv -p hdisk0 PP’s used, location on disk, mount point
• lscfg -vp -l hdisk0 all information about a disk/raid

Filesystem

• fuser -k /dev/cd0 Releases a CD that is being held open by a process
• fuser –c /some/filesystem Find out which PID is holding open the filesystem
• istat filename Shows when the file was last created/modified/accessed

System monitoring

• istat filename Shows create/modify/access file info
• alog -o -t boot displays system boot log
• last –20 Shows last 20 logins
• history Last commands run on the system by this user

Performance issues

• sar –P ALL 2 2 Show all CPU’s activity on an SMP machine
• svmon –i 2 Monitors real and virtual memory
• ps auxw | sort –r +3 |head –10 Shows top 10 memory usage by process
• ps auxw | sort –r +2 |head –10 Shows top 10 CPU usage by process
• ps –auw | grep defunct Shows zombies processes (to kill – reboot or kill the parent)
• filemon –O all –o filemon.out ; find / -name core ; trcstop Traces FS,LV,disks,files activity of a “find” command into a logfile (filemon.out). Must be preceded by a trcstop command.
• tprof –x find / -name core ; trcstop Traces CPU activity of a “find” command. Several logfiles are created. Must be preceded by a trcstop command.
• tprof -ske -x “sleep 30” Trace CPU activity for next 30 seconds. Results in file sleep.tprof.
• lvmstat –ev vgname Enable lvmstat tracing on VG vgname
• lvmstat –v vgname 2 Display LVM stats every 2 seconds on VG vgname
• lvmstat -dv vgname Disable lvmstat tracing on VG vgname

Remote issues (working over the modem)

• pdelay tty0; pdisable tty0 >/dev/null ;penable tty0 Resets tty0
• stty erase ‘^?’ Makes backspace work if backspace is DEL
• stty erase ‘^H’ Makes backspace qork if backspace is CTRL-H
• kermit -l /dev/ttyx –c atdt phone# Use Unix to dial out using the modem on serial port ttyx
• kermit -s /some/file -i Sends a file to a remote instance of kermit in binary mode
• kermit –r Receives a file from a remote instance of kermit

Browsing errlog with errpt

• errpt -a -s 0604090601 -e 0605090901 browse the errlog in detail for all errors within a timeframe
• errpt -a -N SYSPROC List error logs for the SYSPROC resource
• errpt -j 5DFED6F1 Browse the errlog by the identifier
• errpt –A Shows fewer details then errpt -a
• errpt –D Eliminates double entries

Security issues

• chmod -s filename Remove suid (“sticky”) bit to a file or directory
• chmod +r+w+x+t filename Add Read+Write+Execute+Temp mode to a file or directory. This is a ‘blanket’ change for all owner, user & group, otherwise:

Numeric Access Modes  
0 (---) - no access
1 (--x) - execute permissions; search permissions for directories
2 (-w-) - write access
3 (-wx) - execute/search permission and write access
4 (r--) - read access
5 (r-x) - execute/search permission and read access
6 (rw-) - read and write access
7 (rwx) - execute/search permission and read and write access

• mkpasswd -f rebuild the /etc/passwd indexes in case of suspected corruption