I configured syslog in XTREMIO and currently working fine. I can see failed logins but not successful logins. Is there a way to log successful logins as well?
Unfortunately successful login events are not currently logged, so there's no way to get this directly from the XtremIO. (If you're using LDAP/AD then you may be able to get it from your LDAP/AD server)
However the good news is that this is being added in XtremIO version 4.0, which is a few short weeks off being released. As of 4.0 you'll be not only be able to log successful logins, but also logouts and session timeouts (using the auto-logout/timeout feature for both the GUI and CLI that is also new in 4.0!)