Simple linux bandwidth monitoring with bwm-ng
Where has this tool been all my life?
These past few days I've been running some load tests on new servers, configurations and our Internet link. While we have a Cacti installation graphing everything via SNMP, the 5 minute polling interval means waiting for what seems like forever.
I just want some quick and clean bandwidth statistics!
After some years of needing a simple tool, finally bwm-ng has entered my life. Where have you been all these years, bwm-ng? I assume that bwm-ng is short for "bandwidth monitor, next generation."
My only complaint is that when monitoring network interfaces, ethernet bonds are treated as equals to the real interfaces rather than the virtual cumulative devices they are.
Other than that, this tool rocks. Some features that are most pleasing:
- Displays different units: bps to Mbps, Bps to MBps
- Network interfaces and hard drives
- Simple, clean and easy to comprehend user interface
- 100ms polling interval granularity
apt-getinstallation on Debian Lenny
#geekloveatfirstsight
Multiple bonds on Debian Lenny, and related No such device error
SIOCSIFADDR: No such device on Debian Lenny with NIC bonding
While setting up a few Debian Lenny machines this summer, I came across the error message SIOCSIFADDR: No such device a few times. All of these servers have NIC bonding configured, and a few of them have multiple Ethernet bonds. Here are a couple of potential causes for this error message:
- The
/etc/modprobe.d/arch/X86_64file does not contain the bonded device name. For multiple bonded devices, the file must contain an alias entry for each. Here is an example for a two device system named bond0 and bond1:alias bond0 bonding alias bond1 bonding - The
/etc/modulesmodule for bonding (bonding mode=4 miimon=100 max_bonds=2) is configured for fewer bonds than the server has. The heremax_bonds=2is the maximum number of bonding devices your system will have. The default is 1. If you machine has more, thenSIOCSIFADDR: No such devicewill appear for the devices that did not come up.
Adding a hot spare to a P400 controller in an HP DL380 at the command line in linux
Just so I don't forget. Again.
berea:~# hpacucli
HP Array Configuration Utility CLI 8.28-13.0
Detecting Controllers...Done.
Type "help" for a list of supported commands.
Type "exit" to close the console.
=> ctrl all show
Smart Array P400 in Slot 1 (sn: P61620D9SUK034)
=> ctrl slot=1 show
Smart Array P400 in Slot 1
Bus Interface: PCI
Slot: 1
Serial Number: P61620D9SUK034
Cache Serial Number: PA82C0H9SUJL94
RAID 6 (ADG) Status: Disabled
Controller Status: OK
Chassis Slot:
Hardware Revision: Rev D
Firmware Version: 7.08
Rebuild Priority: Medium
Expand Priority: Medium
Surface Scan Delay: 15 secs
Post Prompt Timeout: 0 secs
Cache Board Present: True
Cache Status: OK
Accelerator Ratio: 100% Read / 0% Write
Drive Write Cache: Disabled
Total Cache Size: 256 MB
No-Battery Write Cache: Disabled
Battery/Capacitor Count: 0
SATA NCQ Supported: True
=> ctrl slot=1 array all show
Smart Array P400 in Slot 1
array A (SAS, Unused Space: 0 MB)
array B (SAS, Unused Space: 0 MB)
=> ctrl slot=1 ld all show
Smart Array P400 in Slot 1
array A
logicaldrive 1 (68.3 GB, RAID 1, OK)
array B
logicaldrive 2 (136.7 GB, RAID 5, OK)
=> ctrl slot=1 pd all show
Smart Array P400 in Slot 1
array A
physicaldrive 2I:1:1 (port 2I:box 1:bay 1, SAS, 72 GB, OK)
physicaldrive 2I:1:2 (port 2I:box 1:bay 2, SAS, 72 GB, OK)
array B
physicaldrive 1I:1:6 (port 1I:box 1:bay 6, SAS, 72 GB, OK)
physicaldrive 1I:1:7 (port 1I:box 1:bay 7, SAS, 72 GB, OK)
physicaldrive 1I:1:8 (port 1I:box 1:bay 8, SAS, 72 GB, OK)
unassigned
physicaldrive 2I:1:3 (port 2I:box 1:bay 3, SAS, 73.5 GB, OK)
=> ctrl slot=1 array a add spares=2I:1:3
=> ctrl slot=1 pd all show
Smart Array P400 in Slot 1
array A
physicaldrive 2I:1:1 (port 2I:box 1:bay 1, SAS, 72 GB, OK)
physicaldrive 2I:1:2 (port 2I:box 1:bay 2, SAS, 72 GB, OK)
physicaldrive 2I:1:3 (port 2I:box 1:bay 3, SAS, 73.5 GB, OK, spare)
array B
physicaldrive 1I:1:6 (port 1I:box 1:bay 6, SAS, 72 GB, OK)
physicaldrive 1I:1:7 (port 1I:box 1:bay 7, SAS, 72 GB, OK)
physicaldrive 1I:1:8 (port 1I:box 1:bay 8, SAS, 72 GB, OK)
=>
=> exit