Extending Swap Space

[Manix]

You have configured secondary swap at low priority for non vg00 secondary swap which is not a very good idea.

Edit /etc/fstab and add the entry for each of them like this.

/dev/vg??/lv?? ... swap pri=1 0 0

This will enable swap interleaving as primary swap is already set to the default priority of 1.

(lowest number such as 0 gets used first, equal priorities are assigned in round-robin manner).

Further you have 32 Gigs of "pseudo swap" so it means your RAM size should be 50 Gigs which is good , you need to configure swap space at least equal to physical memory.

Check " dmesg | grep -i physical" to check RAM size and make sure you have equal amount of swap.

Look right now 8 Gigs of swap is reserved by some database application i guess.

You have 43 Gigs of free space in vg01 , please go ahead and good amount of swap to make it equal to RAM size ( or as much as you can, i think you need 42 Gigs..- )

Thanks
Manix

[Kavita Poonia]

>> You can not extend swap lv on a fly , yes lvol can be extended but "swapon -a " wont see it , you do need contagious extents to extend that lvol & reboot is needed as well.



Secondary device swap in your case can be extended on same disk or new disk online with lvextend & swapon -a command. No reboot is required for swapon -a. Then its not necessary for secondary device swap to be contiguous but primary swap has to be.

Thanks & regards,
Kavita

[Manix]

>>>>> You can not extend swap lv on a fly , yes lvol can be extended but "swapon -a " wont see it , you do need contagious extents to extend that lvol & reboot is needed as well.

>>you do need contagious extents to extend ..>>that<< lvol

Hello Kavita

Thanks for checking in but these comments were only for "primary swap" that can`t be extended on fly and needs contagious extents ( if possible ..with certain work around )+ reboot.

Not for secondary do check the same -- ))

Thanks
Manix

[Kavita Poonia]

Sorry my mistake....Manix is correct....I thought you need to create new sec. device swap which is online but for extending existing device swap you need to do swap off & extend it which is offline activity.

Thanks & regards,
Kavita

[Vipin K Gupta]

Hi,

I just need to extend swap to 32 GB.

I can create a new swap or I can extend the existing secondary swap.

I got confused.

Conclusion - We can extend the existing secondary swap online right???

Thanks
Vipin

[Manix]

Better create new swap devices as per requirement & don`t get confused !!

Secondary can be extended ( needs reboot after that ) and we need to check what option you used while creating it ( -c y ) & do the things accordingly.

As we already discussed ,create new swap devices .

Thanks
Manix

[223848]

Hi Manix,
I have one doubt,
If i created a secondary swap without -C y option, can i extend the swap with lvextend.

What i understood is.
If i created the secondary swap without -C y option, then i have to do swapoff on that LV.
Then i have to extend the LV

Then i have to do swapon on that LV.

Is my undestanding is ryt?

[Manix]

Hello Laiju !

I am not able to find any HP doc ,supporting that secondary swap can be non - contagious.

But 'swapoff' is not a native in built command & there is patch for 11.31 only (AFAIK).read the link below.

https://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=SwapoffEn

I would still prefer to keep add a new device for -C y option .

Thanks
Manix

[223848]

Thank you Manix