And also, I forgot to mention about method CreateDirectoryChain in %File class. And you should use it, if you want just create a folder.

But back to $zf, can you try this command ?

set cmd="mkdir e:\Sample\new" > output.log 2> output.log"
set res=$zf(-1, cmd)

and what will be in res variable, and in output.log file which you can find in database folder for your namespace.

Yes, you right, but you should also remember, that your file can also be in another property, like `Content`. 

I think that you want to set some limit, for file which is available to upload to server. And in this case, this file will be uploaded at the server any way. And I would recommend to use FileAPI on client side, and you can check file size before loading it to the server.

What do you mean ?

To get this task running every hour every day, you should use Daily, and set every 60 minutes or 1 hours, and set a limit for this task in days time, like working only in business hours. And you can also use Weekly and Monthly schedule, with working every hours. It means that you can set task to work only in working days at business hours every hour.

And OnDemand tasks, will run only by manual, and will be run only once after start.

In a development process, you can use any latest version of Caché, and export all code to source control system, in version which you use in production. It is not so difficult as may looks. Except only if you use so old system, like 2010.1 or earlier, because export qualificator /cacheversion supports version 2010.2 and later. In this case, you should have some building process, which will be at right version, which you need. I've used this way for years, and for our client we built two versions 2010.2 and 2012.2 from the same repository. You just should not use some new features, or use macroconditions by version, except JSON, you can't use anyway if lowest version doesn't support it yet.

I haven't used SSD in production yet. I'm sure there lots of people who can say more about it. But anyway as I know, all modern SSD, and even which is special for servers, now has a very big count of rewrites. So, it means, that in most cases now you should care about it at all. And fragmentation could be a problem only when you have so many empty blocks, which should be cached, but you don't have some many RAM for it.