How to Get Attached Disk Size on FreeBSD

freebsdhard drive

When I attach a disk to FreeBSD I can list any attached disks by doing:

[root@freenas] ~# sysctl kern.disks
kern.disks: xbd2 xbd1 ada0
[root@freenas] ~#

How can I then find out the size of each attached disk?

Best Answer

diskinfo -v ada0 if you just want to see disk size.

If you want to use this info in some script, you can parse sysctl -n kern.geom.confxml output.

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Linux Hard Disk Load – How to Monitor Hard Disk Load on Linux

You can get a pretty good measure of this using the iostat tool.

% iostat -dx /dev/sda 5

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.78    11.03    1.19    2.82    72.98   111.07    45.80     0.13   32.78   1.60   0.64

The disk utilisation is listed in the last column. This is defined as

Percentage of CPU time during which I/O requests were issued to the device (band-width utilization for the device). Device saturation occurs when this value is close to 100%.

Freebsd – KVM attach drive to FreeBSD guest

After much googling, I found the following on libvirt mailinglist

The command is

virsh: attach-disk freenas /space/morespace.img sdb (as opposed to vdb)

Best Answer

Related Solutions

Linux Hard Disk Load – How to Monitor Hard Disk Load on Linux

Freebsd – KVM attach drive to FreeBSD guest

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