tmpfs in jail?

[dirkme]

Hi Guys,

I still haven't given up yet to get Plex to transcode into a ram disk.

When i am in a terminal in my jail and try to do

Code:

mount -t tmpfs tmpfs	/tmp

I get a "not permitted"

I then tried this in /etc/rc.conf

Code:

tmpmfs="YES"
tmpsize="100m"
tmpmfs_flags="-S"

and added:

Code:

tmpfs /path/to/the/directory tmpfs rw 0 0

in the jail /etc/fstab.

But i don't think it worked (course I restarted the jail etc.)

Any ideas?

 

[SweetAndLow]

If you ever get this running I would love to see your performance changes and the numbers showing an improvement. I assume latency would improve but I have my doubts about it making a difference.

 

[wblock]

But i don't think it worked (course I restarted the jail etc.)

What does mount | grep tmpfs say?

 

[dirkme]

What does mount | grep tmpfs say?

No output, nothing visible.

 

[dirkme]

If you ever get this running I would love to see your performance changes and the numbers showing an improvement. I assume latency would improve but I have my doubts about it making a difference.

It is more about reducing the read write stress on my hdds. Transcoding in ram leaves it without any read and write on my physical hdds.

 

[SweetAndLow]

It is more about reducing the read write stress on my hdds. Transcoding in ram leaves it without any read and write on my physical hdds.

Ok but it's not stressful. Disks are meant for reads and write. So again if love to see your tests that show this is better in some way.

 

[wblock]

There is a setting for allow.mount.tmpfs for FreeBSD jails. See jail(5).

 

[dirkme]

There is a setting for allow.mount.tmpfs for FreeBSD jails. See jail(5).

OK, I am official not smart enough, How do i use this

Code:

allow.mount.tmpfs

?

 

[dirkme]

So.... you guys let me die stupid ;-)

I would guess it goes in /etc/boot.conf?

 

[wblock]

No. On FreeBSD, it would go in /etc/jail.conf. On FreeNAS 11, it is probably done through iocage.

 

[Jakob Tewes]

In an iocage jail, you have to set the required parameters like this

Code:

iocage get all jailname | grep allow_mount_tmpfs

-> initially set to "0", must be "1"

Code:

iocage get all jailname | grep allow_mount

-> initially set to "0", must be "1"

Code:

iocage get all jailname | grep enforce_statfs

-> initially set to "2", must be below "2"

Code:

iocage set allow_mount_tmpfs=1 jailname
iocage set allow_mount=1 jailname
iocage set enforce_statfs=1 jailname

Please let me know, if there is a performance change :-9