hi bakies,
the compatiblity matrix is available here
https://support.ca.com/irj/portal/anonymous/phpdocs?filePath=0/4536/111/4536_111_cdl.htmlthe last device update for ARCSERVE 11.1 was way back in 2006..which essentially means that your backup solution is near to 4 years without any patches. The support for ARCserve 11.1 dropped almost 2 yrs back.
Having said that, buying the current version of arcserve would not cost you the same as it would cost for a new tape library what ever be the vendor.
A simple search on the
http://support.ca.com for CA ARCserve Backup Release 11.1 certified device list will give you the link. for you to be able to identify what drives are support for what version of tape library, click on the "certified tape library manufacturers" link which will get you to the list of vendors and then select the vendor. This will give the list of tape libraries that are provided by the vendor and what is the support configuration.
Please remember that the list is what is tested by CA and as provided by the vendor. The vendor might have changed the name of the library or the same may no longer be available.
Having said that LTO4 without the WORM media is support on 11.1
regards
Bhanu