Would need to understand.. for vSphere 5.5
Maximum number of Esxi host- Update manager can re mediate concurrently without disrupting DRS settings .
Maximum number of VMs it can remediate concurrently without any delay and for vmtool and h/w version upgrade on VC level
Min or max space we need free on data store to have vm snapshot with/without memory on data tsore for max 72 hours.
Thanks