[Users] Difference between swap and swappages?

[Arjit Chaudhary]

Hi,
> Is it for containers or the host? You can use vzubc to check it.

The containers are around 1GB - 2GB RAM allocation with 2 - 4G swap each
(Swap = 2x RAM)

re: vzubc

No package vzubc available.
Error: Nothing to do




On Wed, Dec 11, 2019 at 1:24 AM Kirill Kolyshkin <kolyshkin at gmail.com>
wrote:

> On Tue, 10 Dec 2019 at 11:30, Arjit Chaudhary <arjit.c at gmail.com> wrote:
>
>> Hi,
>> Aha so they're the same thing, was just curious as I've been noticing a
>> bit of odd behavior on OpenVZ 7 host-nodes where the node has 128G RAM,
>> around 30G used and it's swapping out 12G still instead of using the RAM as
>> vSwap. Swappiness is set to 10 as well.
>>
>
> Is it for containers or the host? You can use vzubc to check it.
>
> In general, it's normal for some swappiness to occur even in case there's
> enough free RAM, but I agree that the figure of 12G looks a bit too big.
>
>
>>
>> I'm using the following commands to build the container if that help,
>>
>> /usr/sbin/vzctl create $VMID --ostemplate $DISTRO
>> /usr/sbin/vzctl set $VMID --ipadd $VPS_IP --save
>> /usr/sbin/vzctl set $VMID --hostname vps.server.com --save
>> /usr/sbin/vzctl set $VMID --nameserver 8.8.8.8 --save
>> /usr/sbin/vzctl set $VMID --diskspace
>> $DISK_SPACE$DISK_VARIABLE:$DISK_SPACE$DISK_VARIABLE --save
>> /usr/sbin/vzctl set $VMID --ram $RAM$RAM_VARIABLE --swappages
>> $SWAP$SWAP_VARIABLE --save
>>
>>
> Again, please read the man page and use --swap not --swappages. If you're
> so inclined to use --swappages, please do it in a correct manner (barrier
> should be set to 0 as described).
>
>
>>
>>
>> On Wed, Dec 11, 2019 at 12:51 AM Kirill Kolyshkin <kolyshkin at gmail.com>
>> wrote:
>>
>>> On Tue, 10 Dec 2019 at 10:42, Arjit Chaudhary <arjit.c at gmail.com> wrote:
>>>
>>>> Hi,
>>>> Is there any difference between setting vSwap on the OpenVZ 7 based
>>>> virtual machine?
>>>>
>>>> vzctl set $VMID --ram $RAM --swap $SWAP --save
>>>>
>>>> vs
>>>>
>>>> vzctl set $VMID --ram $RAM --swappages $SWAP --save
>>>>
>>>>
>>>> does --swap end up using real swap on the host-node
>>>>
>>>> and
>>>>
>>>>  --swappages use the RAM as swap (ie, vswap) ?
>>>>
>>>>
>>>> or are both the same ?
>>>>
>>>
>>> Please take a look at vzctl man page, it's all described in there. In
>>> short, you should use --swap;
>>> --swappages is working but obsolete.
>>>
>>>
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>>>
>>
>>
>> --
>> Thanks,
>> Arjit Chaudhary
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>>
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>


-- 
Thanks,
Arjit Chaudhary
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