You can also just mount /var/lib/ganglia/rrds as tmpfs: none /var/lib/ganglia/rrds tmpfs size=1024M,mode=755,uid=nobody,gid=root 0 0
Thanks to Jason Smith for providing me with this info in the first place. Cheers, Bernard On 7/11/07, Matthias Blankenhaus <[EMAIL PROTECTED]> wrote: > > > On Wed, 11 Jul 2007, Ofer Inbar wrote: > > > gmetad is very write-intensive, because it updates hundreds of RRD > > files about every minute or two. Has anyone tried running it with > > the rrd directory on a RAM disk (tmpfs) ? > > > > You'd need something to periodically copy the RRDs to a real disk, > > but that could happen much less frequently (maybe every 20 minutes). > > > > You'd also need a more complicated boot time startup procedure to set > > up the repository on RAM disk before starting gmetad. > > > > Have any of you tried anything like this? What'd you do? How'd it go? > > -- Cos > > First of, you need to reroute your data, e.g. to /dev/shm. So in > gmetad.conf I have the following: > > ... > #------------------------------------------------------------------------------- > # Where gmetad stores its round-robin databases > # default: "/var/lib/ganglia/rrds" > # rrd_rootdir "/some/other/place" > rrd_rootdir "/dev/shm/rrds" > > > Secondly, in /etc/init.d/gmetad you need to create /dev/shm/rrds before > using it. So I have this: > > ## if rrd directory in /dev/shm does not exist, create it > if [ -d /dev/shm/rrds ] ; then > echo "rrd directory already exists in /dev/shm" > else > mkdir /dev/shm/rrds > chmod 755 /dev/shm/rrds > chown nobody.nobody /dev/shm/rrds > fi > > Thirdly, you need some logic to archive the rrds from /dev/shm/ to a > disk. > > Hope that helps, > Matthias > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by DB2 Express > > Download DB2 Express C - the FREE version of DB2 express and take > > control of your XML. No limits. Just data. Click to get it now. > > http://sourceforge.net/powerbar/db2/ > > _______________________________________________ > > Ganglia-general mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/ganglia-general > > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > Ganglia-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ganglia-general > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
