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From Makrand <makrandsa...@gmail.com>
Subject Snapshot and secondary storage utilisation.
Date Mon, 10 Jul 2017 07:13:30 GMT
​​
Hi all,

My setup is:- ACS 4.4. XENserver 6.2 SP1. 4TB of secondary storage coming
from NFS.

I am observing some issues the way *.vhd* files are stored and cleaned up
in secondary storage. Let's take an example of a VM-813. It has 250G root
disk (disk ID 1015) The snapshot is scheduled to happen once every week
(sat night) and supposes to keep only 1 snapshot. From GUI I am seeing its
only keeping the latest week snapshot.

But resource utilization on CS GUI is increasing day by day. So I just ran
du -smh and found there are multiple vhd files of different sizes under
secondary storage.

Here is snippet:-

root@gcx-bom-cloudstack:/mnt/secondary2/snapshots/22# du -smhh *
1.5K    1002
1.5K    1003
1.5K    1004
*243G    1015*
1.5K    1114

root@gcx-bom-cloudstack:/mnt/secondary2/snapshots/22# ls -lht *
*1015:*
*total 243G*
*-rw-r--r-- 1 nobody nogroup  32G Jul  8 21:19
8a7e6580-5191-4eb0-9eb1-3ec8e75ce104.vhd*
*-rw-r--r-- 1 nobody nogroup  40G Jul  1 21:30
f52b82b0-0eaf-4297-a973-1f5477c10b5e.vhd*
*-rw-r--r-- 1 nobody nogroup  43G Jun 24 21:35
3dc72a3b-91ad-45ae-b618-9aefb7565edb.vhd*
*-rw-r--r-- 1 nobody nogroup  40G Jun 17 21:30
c626a9c5-1929-4489-b181-6524af1c88ad.vhd*
*-rw-r--r-- 1 nobody nogroup  29G Jun 10 21:16
697cf9bd-4433-426d-a4a1-545f03aae3e6.vhd*
*-rw-r--r-- 1 nobody nogroup  29G Jun  3 21:00
bff859b3-a51c-4186-8c19-1ba94f99f9e7.vhd*
*-rw-r--r-- 1 nobody nogroup  43G May 27 21:35
127e3f6e-4fa5-45ed-a95d-7d0b850a053d.vhd*
*-rw-r--r-- 1 nobody nogroup  60G May 20 22:01
619fe1ed-6807-441c-9526-526486d7a6d2.vhd*
*-rw-r--r-- 1 nobody nogroup  35G May 13 21:23
71b0d6a8-3c93-493f-b82c-732b7a808f6d.vhd*
*-rw-r--r-- 1 nobody nogroup  31G May  6 21:19
ccbfb3ec-abd8-448c-ba79-36631b227203.vhd*
*-rw-r--r-- 1 nobody nogroup  32G Apr 29 21:18
52215821-ed4d-4283-9aed-9f9cc5acd5bd.vhd*
*-rw-r--r-- 1 nobody nogroup  38G Apr 22 21:26
4cb6ea42-8450-493a-b6f2-5be5b0594a30.vhd*
*-rw-r--r-- 1 nobody nogroup 248G Apr 16 00:44
243f50d6-d06a-47af-ab45-e0b8599aac8d.vhd*


Observed same behavior for root disks of other 4 VMs. So the number of vhds
are ever growing on secondary storage and one will eventually run out of
secondary storage size.

Simple Question:-

1) Why is cloud stack creating multiple vhd files? Should not it supposed
to keep only one vhd at secondary storage defined in snap policy?

Any thoughts? As explained earlier...from GUI I am seeing last weeks snap
as backed up.



--
Makrand

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