In case that you are doing routine checkup of your LPAR's on IBM pSeries, you probably are checking status of your LPAR OS disks or volume group from time to time.
To check status of your volume group hdisks use this
root@aix-server> [/] lsvg -p roottvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 missing 546 4 00..00..00..00..04
hdisk1 active 546 0 00..00..00..00..00
As you can see one of hdisk is missing! And you start to panic! "OMG, hdisk is missing, where, how, when?!?!"
There is no place for panic. You will see that one of your disks is missing only after you have restarted one of your VIOS. In are case there is two VIOS. hdisk0 is from first VIOS, hdisk1 is from second VIOS. These two hdisk is creating volume group called rootvg.
How to fix this missing hdisk state?
All you need to do is to activate.
root@aix-server> [/] varyon rootvg
This will activate your volume group rootvg. After this you will see both of your hdisk as active!
Why this is important? Because of this:
When a volume group is activated, physical partitions are synchronized if they are not current.
But there is one case when you can't make your hdisk active without making additional changes! In this case, after you execute varyon command, error will be prompted and you won't be able to make your hdisk active!
root@aix-server> [/] varyon rootvg
varyonvg: Cannot varyon volume group with an active dump device on a missing physical volume. Use sysdumpdev to temporarily replace the dump device with /dev/sysdumpnull and try again.
So, as error said active dump device is on missing physical volume hdisk0.(I will not explaind here what system dump device is) How to change this? First we will list status of sysdump devices.
root@aix-server> [/] sysdumpdev -l
primary /dev/lg_dumplv
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
From here we can see, that primary device is located on /dev/lg_dumplv and secondary device is /dev/sysdumpnull. In error message, active dump device is actually primary dump device in sysdumpdev -l. So we need to change that.
root@aix-server> [/] sysdumpdev -p /dev/sysdupmnull
List again sysdump devices.
root@aix-server> [/] sysdumpdev -l
primary /dev/sysdumpnullsecondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
Now execute activation of volume group.
root@aix-server> [/] varyon rootvg
root@aix-server> [/]
root@aix-server> [/] lsvg -p rootvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 546 4 00..00..00..00..04
hdisk1 active 546 0 00..00..00..00..00
As you can see now, both hdisk are active now.
Now, change back you primary dump device
root@aix-server> [/] sysdumpdev -p /dev/lg_dumplv
To check status of your volume group hdisks use this
root@aix-server> [/] lsvg -p roottvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 missing 546 4 00..00..00..00..04
hdisk1 active 546 0 00..00..00..00..00
As you can see one of hdisk is missing! And you start to panic! "OMG, hdisk is missing, where, how, when?!?!"
There is no place for panic. You will see that one of your disks is missing only after you have restarted one of your VIOS. In are case there is two VIOS. hdisk0 is from first VIOS, hdisk1 is from second VIOS. These two hdisk is creating volume group called rootvg.
How to fix this missing hdisk state?
All you need to do is to activate.
root@aix-server> [/] varyon rootvg
This will activate your volume group rootvg. After this you will see both of your hdisk as active!
Why this is important? Because of this:
When a volume group is activated, physical partitions are synchronized if they are not current.
But there is one case when you can't make your hdisk active without making additional changes! In this case, after you execute varyon command, error will be prompted and you won't be able to make your hdisk active!
root@aix-server> [/] varyon rootvg
varyonvg: Cannot varyon volume group with an active dump device on a missing physical volume. Use sysdumpdev to temporarily replace the dump device with /dev/sysdumpnull and try again.
So, as error said active dump device is on missing physical volume hdisk0.(I will not explaind here what system dump device is) How to change this? First we will list status of sysdump devices.
root@aix-server> [/] sysdumpdev -l
primary /dev/lg_dumplv
secondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
From here we can see, that primary device is located on /dev/lg_dumplv and secondary device is /dev/sysdumpnull. In error message, active dump device is actually primary dump device in sysdumpdev -l. So we need to change that.
root@aix-server> [/] sysdumpdev -p /dev/sysdupmnull
List again sysdump devices.
root@aix-server> [/] sysdumpdev -l
primary /dev/sysdumpnullsecondary /dev/sysdumpnull
copy directory /var/adm/ras
forced copy flag TRUE
always allow dump FALSE
dump compression ON
Now execute activation of volume group.
root@aix-server> [/] varyon rootvg
root@aix-server> [/]
root@aix-server> [/] lsvg -p rootvg
rootvg:
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk0 active 546 4 00..00..00..00..04
hdisk1 active 546 0 00..00..00..00..00
As you can see now, both hdisk are active now.
Now, change back you primary dump device
root@aix-server> [/] sysdumpdev -p /dev/lg_dumplv
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