Trixwood at 16:23, 20 August 2016

2016-08-20T16:23:10Z

New page

I found a page on extending the "life" of the SDcard, here: http://www.makeuseof.com/tag/extend-life-raspberry-pis-sd-card/

The minimal suggestion is much alike the one made here, to move the tmp to RAM, but the size of RAM is much bigger.
Instead of 1MB it suggests moving it to 100MB.

tmpfs /tmp tmpfs defaults,noatime,nosuid,size=100m 0 0

But also to move the log file to RAM... and even more...

tmpfs /tmp tmpfs defaults,noatime,nosuid,size=100m 0 0
tmpfs /var/tmp tmpfs defaults,noatime,nosuid,size=30m 0 0
tmpfs /var/log tmpfs defaults,noatime,nosuid,mode=0755,size=100m 0 0
tmpfs /var/run tmpfs defaults,noatime,nosuid,mode=0755,size=2m 0 0
tmpfs /var/spool/mqueue tmpfs defaults,noatime,nosuid,mode=0700,gid=12,size=30m 0 0

Thats your opinion?
Do you think its smart of to allocate over 262MB of memory of a small Rapsberry PI for this?

Or should we move into use of a USB memory stick instead. More complex, bus more robust.

----
==/var/tmp : "Temporary files preserved between system reboots"==

The Filesystem Hierarchy Standard (FHS) states the following:
/var/tmp : "Temporary files preserved between system reboots"
(see: [https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard#Directory_structure WikiPedia] or [http://www.pathname.com/fhs/pub/fhs-2.3.html#VARTMPTEMPORARYFILESPRESERVEDBETWEE FHS 2.3 /var/tmp])

/tmp : "Programs must not assume that any files or directories in /tmp are preserved between invocations of
the program" and "... it is recommended that files and directories located in /tmp be deleted
whenever the system is booted"
(see: [http://www.pathname.com/fhs/pub/fhs-2.3.html#TMPTEMPORARYFILES FHS 2.3 /tmp])

So should this page not advise to enable tmpfs for /tmp instead of /var/tmp?

==Prefered way to mount /tmp as a tmpfs ([https://www.domoticz.com/wiki/Setting_up_a_RAM_drive_on_Raspberry_Pi RAMdrive])==
There are preferred mechanisms in Debian / Raspbian to mount /tmp as a tmpfs (RAMdrive):
* On Wheezy add add/change a line with <code>RAMTMP=yes</code> to <code>/etc/default/tmpfs</code> (or <code>/etc/default/rcS</code> if the former has no effect). (see [https://www.raspbian.org/RaspbianFAQ#No_space_left_on_device.2C_but_I_have_plenty_of_free_space_on_my_SD_card._What_do_I_do.3F RaspbianFAQ] or [http://www.unixlore.net/cgi-bin/man/man2html?tmpfs+5 the tmpfs man page])
* On Jessie enable the systemd unit <code>tmp.mount</code> with <code>sudo systemctl enable tmp.mount</code>. (see [https://www.google.com/search?q=tmp.mount+tmpfs+systemd+debian+jessie Google, i could not find a good reference to systemd tmp.mount])

[[Category:Raspberry Pi]]

Best wishes,
Mick

--[[User:Mick|Mick]] ([[User talk:Mick|talk]]) 23:32, 18 March 2016 (CET)

[[Category:Domoticz]]
[[Category:Manual]]
[[Category:Setup]]
[[Category:Raspberry Pi]]

Talk:Setting up a RAM drive on Raspberry Pi - Revision history

Trixwood at 16:23, 20 August 2016