Re: [ovirt-users] hot plug memory in el7
On Thu, Dec 10, 2015 at 12:24 PM, Michal Skrivanek <mskrivan(a)redhat.com>
wrote:
>
> Yes, CentOS 7.1 updated up to a couple of days ago.
Can you try 7.2? I don’t remember exactly but it may be that in earlier
guests it’s not automatic. Check some tips for onlining memory explicitly
5.2. How to online memory
------------
Even if the memory is hot-added, it is not at ready-to-use state.
For using newly added memory, you have to "online" the memory block.
For onlining, you have to write "online" to the memory block's state file
as:
% echo online > /sys/devices/system/memory/memoryXXX/state
Hello,
with your suggestions it worked as expected, without updating any packages
in VM 7.1 guest (I seemed to remember that the forced online operation
should not be necessary any more...):
Starting state with 10Gb of ram inside the VM
[root@racclient1 ~]# ll -d /sys/devices/system/memory/memory* | wc -l
80
slots defined:
0 --> 23
32 --> 87
Increase from web gui memory from 10240 to 12288
I see this in messages as expected
Dec 10 12:59:32 racclient1 kernel: init_memory_mapping: [mem
0x2c0000000-0x33fffffff]
In /sys/devices/system/memory I see 16 new memoryxx directories (probably
each one addressing 128Mb...)
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
They have indeed been added but are offline, eg
latest previous one:
[root@racclient1 ~]# cat /sys/devices/system/memory/memory87/state
online
first newly added one:
[root@racclient1 ~]# cat /sys/devices/system/memory/memory88/state
offline
[root@racclient1 ~]# cat /sys/devices/system/memory/memory87/online
1
[root@racclient1 ~]# cat /sys/devices/system/memory/memory88/online
0
put online the new segments:
[root@racclient1 ~]# for i in $(seq 88 103)
do
echo online > /sys/devices/system/memory/memory${i}/state
done
Memory has been increased now, also from inside the OS.
[root@racclient1 ~]# free
total used free shared buff/cache
available
Mem: 12334428 222080 11934044 8480 178304
12019544
NOTE: no new entries after online memory, neither in messages file nor in
dmesg output.
Questions:
1) which component to bugzilla against for message confusing window of the
gui?
2) Initially I see that my VM (in webadmin gui) has 8Gb of defined memory
AND 8Gb of "Physical Memory Guaranteed".
After increasing memory, the second one remains the same and doesn't change
even after shutdown / Power on.
I think it could be an enhancement to ask the user if he/she wants to
change it too, instead of manually go through
Edit --> resource allocation --> memory allocation screen
If seen as a agreed enhancement, which components to bugzilla against for
RFE?
Gianluca
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