Nested calculated items possible?

[Jason]

I'm trying to write an item that takes the Exchange transaction log drive which I get in getExchangeLogPath and then use that to calculate the space free on the drive for back pressure. The formula gives me an error. Can I next calculated items like this?

100*(last("vfs.fs.size[last("getExchangeLogPath"),total]")-1536M)/last("vfs.fs.size[last("getExchangeLogPath"),total]")

I can see that might have too many inverted commas in there, but can't see a way round it...

Oh on 2.4.7.

[glebs.ivanovskis]

Short answer: no.

First parameter of trigger function in calculated item syntax must be an existing item key. And things like "last(...)" are not supported in item key parameters.

If I understand your intentions correctly, you can achieve your goal by turning getExchangeLogPath item into low-level discovery rule and creating an item prototype 100*(last("vfs.fs.size[{#YOURLLDMACRO},total]")-1536M)/last("vfs.fs.size[{#YOURLLDMACRO},total]").

[Jason]

Hi,

I was coming to the conclusion that might be the only way of doing it. Seems a bit of a sledgehammer to crack a nut scenario though.

Cheers!

[Jason]

Bah,

I can't do low level discovery because I already have one that does the filesystems and I get a clash of item names with the vfs.fs part.

I'll have to re-think.

[Jason]

Got it working eventually, but it's a pain if you've already got a filesystem discovery rule running for other things.