How much continuous writing to disk is ok?

[-fun-]

Hi All,

I have configured the syslog and the reporting database to be written to my pool instead of the boot USB devices. How much IO bandwidth should I assume this to consume?

The reason for the question is that my disks (a mirror of two in one vdev) are continuously written to with a rate of approx. 8 KBytes/s. This seems too high to be caused by the syslog and the reporting database alone.

-fun-

 

[colmconn]

I have my system dataset and datasets for jails and VMs on a mirrored pair of SSDs. They write continuously and have been doing so for years. As I write this they are writing any where from 300 kBps to 3500 kBps.

You can easily monitor what's going on with your drives from the command line using the gstat command. For example, the command I use is

Code:

gstat -f 'a?da[0-9]{1,2}$'

which shows all read and write activity at 1 sec intervals for all devices that match the regular expression passed on the command line. Without the filter you will get all geom producers and consumers which includes a lot of redundant information.