scratch partition and syslog

Hi,

I see that the ESXi scratch partition is by default set to /tmp/scratch, where is this stored?

Is this local on the SD card used for the ESXi install or on ramdisk (space allocated in memory for storing these logs)?

Strangely when I enter df -h on an ESXi host, it does not list the local drive/partitions (SD Card).

For syslog, if I setup a remote host to send logs (syslog.gobal.logHost), do I also need to specify a datastore (Syslog.global.logDir) or can I set this to null?

Thanks