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Operating Systems AIX Raw I/o
# 1  
Old 10-24-2007
Raw Disk I/o

Is there any system call available in AIX to read the size of raw disk?

If I use the command "lspv -L",it only gives size of PVs on which file system is there. I need to extract the size raw disk i.e. file system is not there on the disk.


Last edited by MeghaV; 10-24-2007 at 07:41 AM..
# 2  
Old 10-24-2007
bootinfo -s <hdiskXXX> gives you the size of the disk in MB.

Last edited by Sprellarinn; 10-24-2007 at 07:17 AM.. Reason: Correction
# 3  
Old 10-24-2007
I tried this also. But everytime with "bootinfo -s hdiskXX" it gave me 1024
Where on hdiskXXX no file system is there.
# 4  
Old 10-24-2007
Have a look in smit, it can show the form of command it uses.

# this will list the physical disks
getlvodm -C

# this will show the status of the disk
lspv hdisk0
# 5  
Old 10-24-2007
The problem is there is not a single solution to this, so i give you a list of options you have in order of preferability (is this a word? english is not my native language):

SCSI-disk and native SSA-disks (not SSA-RAID-volumes, etc.) have an attribute called "size_in_mb", which you could read. Example: to get the size of hdisk0 you can type (and get this sample information for a 18GB disk)

# lsattr -El hdisk0 -a size_in_mb
size_in_mb 18200 Size in Megabytes False

If the disk in question is in a volume group you can find out with lspv like this (output is exemplary):
# lspv hdisk4
PHYSICAL VOLUME:    hdisk4                   VOLUME GROUP:     joker_int_vg
PV IDENTIFIER:      000bf05d981228ff VG IDENTIFIER     000bf05d95422f4d
PV STATE:           active                                     
STALE PARTITIONS:   0                        ALLOCATABLE:      yes
PP SIZE:            64 megabyte(s)           LOGICAL VOLUMES:  4
TOTAL PPs:          1093 (69952 megabytes)   VG DESCRIPTORS:   2
FREE PPs:           130 (8320 megabytes)     HOT SPARE:        no
USED PPs:           963 (61632 megabytes)    MAX REQUEST:      256 kilobytes
FREE DISTRIBUTION:  00..00..00..00..130                        
USED DISTRIBUTION:  219..219..218..218..89

you could also use bootinfo, BUT: bootinfo is usually only executable by root, whereas lsattr is executable by everybody AND the bootinfo command won't work on some disks.

I hope this helps.

# 6  
Old 10-26-2007
Also usfull commands

lsvg |lsvg -il

lsvg |lsvg -ip
# 7  
Old 10-26-2007
Originally Posted by ravager
Also usfull commands

lsvg |lsvg -il

lsvg |lsvg -ip
better use the "-o"-option of lsvg to get only the active VGs (the ones in the status VARYON), otherwise you will get a lot of error messages on the standby part of a HACMP cluster:

lsvg -o | lsvg -il

lsvg -o | lsvg -ip


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