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How to monitor a ram disk?

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Some server creates a ram disk every restart.
 
Here my config: 
 
/etc/grub.conf:
line:
kernel ..... ramdisk_size=16777216
 
/etc/rc.local:
mke2fs -m 0 /dev/ram0
mount /dev/ram0 /fbswap
 
df -h:
/dev/ram0              16G   44M   16G   1% /fbswap
 
mount:
/dev/ram0 on /fbswap type ext2 (rw)
 
snmpd.conf:
rocommunity XY
disk /fbswap
 
But OpenNMS doesn't create a ressource graph (Section: Disk Table Index (UCD-SNMP MIB)) for this disk. 
 
OpenNMS version
asked Mar 18, 2014 by mfuhrmann (7,350 points)
Dose it collect data for it? Check if there are RRDs for it on your disc.
No, it doesn't

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