[PVE-User] memory question

[admin-at-extremeshok-dot-com]

To increase or decrease /dev/shm filesystem size

1) Open /etc/fstab with vi or any text editor of your choice,

2) Locate the line of /dev/shm and use the tmpfs size option to specify
your expected size,

e.g. 512MB:
tmpfs      /dev/shm      tmpfs   defaults,size=512m   0   0

e.g. 2GB:
tmpfs      /dev/shm      tmpfs   defaults,size=2g   0   0

The /etc/fstab content format is documented in man fstab and the tmpfs
filesystem options can be found in man mount

3) To make change effective immediately, run this mount command to
remount the /dev/shm filesystem:
mount -o remount /dev/shm

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On 28-May-16 11:07 AM, haoyun wrote:
> hello,everyone~
> I have a cluster with 2 physical machines,and they are pve4.2
> my physical machine:
> root at cna5:~# free
>              total       used       free     shared    buffers     cached
> Mem:      65674780   21937328   43737452      93316     166488    1534868
> -/+ buffers/cache:   20235972   45438808
> Swap:      8388604          0    8388604
>
>
> my vm:
> root at debian:~# free
>              total       used       free     shared    buffers     cached
> Mem:       4063488     124792    3938696          0      10664      39144
> -/+ buffers/cache:      74984    3988504
> Swap:       901116          0     901116
> root at debian:~# cd /dev/shm
> root at debian:/dev/shm# dd if=/dev/zero of=dd.img bs=1M count=3000
> dd: writing `dd.img': No space left on device
> 970+0 records in
> 969+0 records out
> 1016737792 bytes (1.0 GB) copied, 0.250504 s, 4.1 GB/s
> root at debian:/dev/shm# free
>              total       used       free     shared    buffers     cached
> Mem:       4063488    1119324    2944164          0      10680    1032052
> -/+ buffers/cache:      76592    3986896
> Swap:       901116          0     901116
>
>
> why?
> who can help me?
> thanks~
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