How to add disk space to a running virtual machine on a PureApplication System W1700

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Have you been trying to figure out how to add disk space to a running virtual machine on a PureApplication System W1700? Maybe you've been hitting disk space errors when attempting to create new deployment instances and the Event critical error shows:

The file system {0} is running low on disk space. It has {1}MB remaining. Free some disk space to prevent the management server from crashing.

Insufficient disk space on datastore ''...

To add storage volumes to existing virtual machines, see the following best practice instructions for assistance with this procedure:

1. Add Storage Volume.
Select System Console -> Cloud -> Storage Volumes
Click the green plus sign () to Add a new Storage Volume to the appropriate cloud group.

example:

2. Attach new Storage Volume.
Select Workload Console -> Instances -> Virtual Machines
Select the virtual machine where you need the additional storage. 
Below Operating system volumes is a section labeled Storage volumes. Use the drop-down menu to select the storage volume you added in Step 1.

3. Find the new Storage Volume.
Log into the virtual machine as root or a user who can execute file system commands with root privilege.

List all available physical volumes. Note the ones you currently have.
lspv

So the new physical volume is seen
cfgmgr

List all available physical volumes again. The new one is the storage volume you attached in (Step 2):
lspv

The new one will be something like "hdisk1"

4. Extend a volume group to include the new physical volume
extendvg rootvg hdisk1

Note: For larger storage volumes (e.g. 100GB+), extendvg of the volume group to include
the new physical volume may fail with a warning message.

example:
extendvg: Warning, The Physical Partition Size of 64 requires the creation of 3200 partitions for hdisk1.  The limitation for volume group rootvg is 2032 physical partitions per physical volume.  Use chvg command with -t option to attempt to change the maximum Physical Partitions per Physical volume for this volume group.

The following sample script can be used to calculate and increase the maximum Physical Partitions (PP)
per Physical Volume (hdisk1) for the volume group (rootvg).

<------------begin script details------------>

#!/bin/sh

We first calculate the number of PPS available in all the rootvg hdisks

CURRENT_ROOTVG_HDISKS=$(lspv | grep rootvg | awk '{print $1}')
CURRENT_AVAILABLE_PPS=0
for hdisk in ${CURRENT_ROOTVG_HDISKS}; do
HDISK_AVAILABLE_PPS=$(lspv ${hdisk} | grep "TOTAL PPs:" | awk '{print $3}')
((CURRENT_AVAILABLE_PPS=${HDISK_AVAILABLE_PPS}+${CURRENT_AVAILABLE_PPS}))
done

Assuming that the disk we want to add to rootvg is hdisk1, lets get the size of the disk (in GB)

NEW_HDISK_SIZE=$(bootinfo -s hdisk1)

Let's calculate the sizes of the physical partitions we currently have allocated on the disk

PP_SIZE=$(lsvg rootvg | grep "PP SIZE" | awk '{print $6}')

Next, we calculate how many PPS we would have available between the current and new disk

((NEW_AVAILABLE_PPS=${NEW_HDISK_SIZE}/${PP_SIZE}+${CURRENT_AVAILABLE_PPS}))
((TOTAL_AVAILABLE_PPS=${CURRENT_AVAILABLE_PPS}+${NEW_AVAILABLE_PPS}))

We now calculate the max number of PPs we can have on the rootvg volume group

MAXPPPERVG=$(lsvg rootvg|grep "MAX PPs per PV:"|awk '{print $5}')

if MAXPPPERVG < TOTAL_AVAILABLE_PPS, we need to increase the number of PPs per VG for rootvg

if [[ ${MAXPPPERVG} -lt ${TOTAL_AVAILABLE_PPS} ]]; then
((NEW_PPS_PER_VG = ${TOTAL_AVAILABLE_PPS} / 1016 + 1))
chvg -t ${NEW_PPS_PER_VG} rootvg
fi

<------------end script details------------>

After executing the script (comments removed), you should be able to run the extendvg rootvg hdisk1 successfully.

To confirm physical volume is now in volume group
lspv

5. Increase the size of the filesystem(s) to utilize the newly added storage volume.

List all logical volumes in the volume group. Note the existing size of each filesystem
lsvg -l rootvg

Add the additional storage to each filesystem as needed
chfs -a size=<new size> <fs> 

example:
chfs -a size=+2G /opt

Note: to decrease the size of a filesystem, use the "-" sign instead of the "+" sign

example:
chfs -a size=-2G /opt

title image (modified) credit: (cc) Some rights reserved by damyon

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