[OpenIndiana-discuss] OI hipster frequence freeze during update

[Michael Kruger]

On 12/30/2016 06:56 PM, Full Name wrote:
> I've 2GB RAM on the system.   The system has 32-bit intel processor.
>
> how do i check swap/raw partition?

Pulled this from my personal notes for future docs to write.
It shows how to check and enlarge the swap.
Hopefully you can make sense of it.

Michael



Check swap space and adding more

# swap -l
swapfile             dev    swaplo   blocks     free
/dev/zvol/dsk/rpool/swap 283,2         8  2060280  1295128

If blocks and free are the same, then the swap space isn't being used 
and it can be resized.
In this case, half of the space is being used (definitely an indication 
the system could use more memory)

So, we have to add another swap filesystem.

# zfs create -V 2G rpool/swap2

Now we have to activate it.

# swap -a /dev/zvol/dsk/rpool/swap2

And check the available space again

# swap -l
swapfile             dev    swaplo   blocks     free
/dev/zvol/dsk/rpool/swap 283,2         8  2060280  1299488
/dev/zvol/dsk/rpool/swap2 283,3         8  4194296  4194296

Here is an update listing of all the filesystems. Swap and Swap2 are 
listed last.

# zfs list
NAME                           USED  AVAIL  REFER  MOUNTPOINT
rpool                         9.38G   440G  30.5K  /rpool
rpool/ROOT                    5.24G   440G    19K  legacy
rpool/ROOT/openindiana        20.7M   440G  3.81G  /a
rpool/ROOT/openindiana-1      5.22G   440G  3.82G  /
rpool/ROOT/openindiana-1/var  1.39G   440G   943M  /var
rpool/ROOT/openindiana/var    4.46M   440G   975M  /a/var
rpool/dump                    1006M   440G  1006M  -
rpool/export                  44.1M   440G    19K  /export
rpool/export/home             44.1M   440G    19K  /export/home
rpool/export/home/mike        44.0M   440G  44.0M  /export/home/mike
rpool/swap                    1.04G   441G   650M  -
rpool/swap2                   2.06G   442G     8K  -

***NOTE*** adding swap space creates a persistant swap filesystem, but 
the activation does not persist after a reboot.
Probably need to add the 2nd swap space to /etc/vfstab

Also, after a reboot (and before logging into the GUI desktop), the swap 
may not any longer be in use.
This would be a good time to ssh into the system and increase the size 
of the original swap volume.
You could either leave the 2nd swap volume, or remove it.

To increase the space, first verify it's really still free.

swap -l
swapfile             dev    swaplo   blocks     free
/dev/zvol/dsk/rpool/swap 283,2         8  2060280  2060280
/dev/zvol/dsk/rpool/swap2 283,3         8  4194296  4194296

Now lets look at the how big the volume really is.

# zfs get volsize rpool/swap
NAME        PROPERTY  VALUE    SOURCE
rpool/swap  volsize   1006M    local

At 1GB, it's pretty small. Lets enlarge it to 4 GB instead.

# zfs set volsize=4g rpool/swap

Now lets have another look at it.

# zfs get volsize rpool/swap
NAME        PROPERTY  VALUE    SOURCE
rpool/swap  volsize   4G       local

That's much better. We're much less likely to run out of /tmp space now.

NOTE: swap -l will still show the old swap file size until the system 
reboots.
Not sure exactly what this means, but perhaps the new size does not take 
effect until after the reboot.

# zfs list
NAME                           USED  AVAIL  REFER  MOUNTPOINT
rpool                         14.2G   435G  30.5K  /rpool
rpool/ROOT                    6.88G   435G    19K  legacy
rpool/ROOT/openindiana        20.7M   435G  3.81G  /a
rpool/ROOT/openindiana-1      14.2M   435G  3.82G  /
rpool/ROOT/openindiana-1/var  8.37M   435G   993M  /var
rpool/ROOT/openindiana-2      6.85G   435G  4.07G  /
rpool/ROOT/openindiana-2/var  1.64G   435G   901M  /var
rpool/ROOT/openindiana/var    4.46M   435G   975M  /a/var
rpool/dump                    1006M   435G  1006M  -
rpool/export                  44.1M   435G    19K  /export
rpool/export/home             44.0M   435G    19K  /export/home
rpool/export/home/mike        44.0M   435G  44.0M  /export/home/mike
rpool/swap                    4.25G   439G   699M  -
rpool/swap2                   2.06G   437G  51.2M  -