That might happen so that 4Gb, 8Gb, etc... would end sooner or later. Or even all the disk will be used to store temp files. So you probably need to understand why there are so many session files. Is your site under spambot attack? Bruteforce attack? Other malicious activity? Or all the sessions are opened by regular and legitimate users?If all those temporary files are being deleted after a while, I guess all I need to do is move them to a larger partition. Am i right?