[Users] Fragmentation on VZ7

[Chris James]

Wow, thank you Gena! That clears things up. Now it's time to write a 
check for open files and figure this out...

Thanks,
Chris

On 11/01/2016 05:11 PM, Gena Makhomed wrote:
> On 01.11.2016 22:52, Chris James wrote:
>
>> It doesn't seem to do anything if the container is running:
>
> It works with running containers too.
>
> pcompact do nothing if threshold is not exceeded.
>
> /etc/vz/pcompact.conf
>
> # Start compacting if unused space is greater than specified THRESHOLD 
> in percent to ploop size
> THRESHOLD=10
>
>> [root at sovereign ~]# du -sch /vz/private/101/root.hdd/
>> 114G    /vz/private/101/root.hdd/
>>
>> [root at sovereign ~]# vzctl exec 101 df -h /
>> Filesystem         Size  Used Avail Use% Mounted on
>> /dev/ploop42957p1  277G  101G  162G  39% /
>>
>> [root at sovereign ~]# /usr/sbin/pcompact
>> ...
>> Inspect 5120cb33-6817-4888-bd9a-fdbfa87b913e
>> Inspect /vz/private/101/root.hdd/DiskDescriptor.xml
>> Disk: /vz/private/101/root.hdd/DiskDescriptor.xml
>> ploop=288000MB image=115754MB data=108013MB balloon=0MB
>> Rate: 2.7 (threshold=10)
>
> image=115754MB (114G)
> data=108013MB (101G)
> Rate: 2.7 (threshold=10)
>
>> [root at sovereign ~]# du -sch /vz/private/101/root.hdd/
>> 114G    /vz/private/101/root.hdd/
>>
>> [root at sovereign ~]# vzctl exec 101 df -h /
>> Filesystem         Size  Used Avail Use% Mounted on
>> /dev/ploop42957p1  277G  101G  162G  39% /
>>
>> [root at sovereign ~]# vzctl stop 101
>
> !!! you have used 101G inside container.
>
> after stop container - free space is changed to 57G
>
> threshold is exceeded, and pcompact start to work.
>
>> [root at sovereign ~]# /usr/sbin/pcompact
>> ...
>> pass4 group:2224 Relocated inodes:0, local:0 extents: 0, blocks 0
>> Starting relocation
>> Opening delta /vz/private/101/root.hdd/root.hds
>> TRUNCATED: 116 cluster-blocks (121634816 bytes)
>> ...
>> < tons of output >
>>
>> [root at sovereign ~]# vzctl start 101
>>
>> [root at sovereign ~]# du -sch /vz/private/101/root.hdd/
>> 76G    /vz/private/101/root.hdd/
>>
>> [root at sovereign ~]# vzctl exec 101 df -h /
>> Filesystem         Size  Used Avail Use% Mounted on
>> /dev/ploop42957p1  277G   57G  207G  22% /
>>
>> So I guess my question is am I expect to /stop/ and compact my
>> containers regularly?
>
> You have 44G *DELETED* *OPEN* files inside contaier.
>
> This is not normal situation.
>
> If you can't prevent such deleted but still open files -
> you have only one way: restart containers (by cron?)
> and run pcompact by cron after restarting containers.
>
> Better way - prevent deleted but still open files
> inside your containers, and use pcompact on running containers.
>
> P.S.
>
> Try to set THRESHOLD=1 in /etc/vz/pcompact.conf for better compacting.
>