Library inventory time 13.5 Upgrades and optional features 13.6 Advanced Library Management System During normal use of the TS3500 tape library for bulk loading of cartridges, the library  performs an inventory operation to check the (possibly new) content of the cartridge storage  slots. During this time, the accessor is occupied by scanning the bar code labels and empty  slots. The inventory process for the TS3500 tape library is performed efficiently, usually  taking fewer than 60 seconds per frame. For more information about inventory performance,  see “Performing an inventory” on page 363. The TS3500 tape library has a number of optional features. These features enhance the  library by providing extra functions, more capacity, higher reliability, and greater serviceability. For more information about available features, see IBM Knowledge Center for the IBM  TS3500 tape library: https://www.ibm.com/support/knowledgecenter/en/STCMML8/com.ibm.storage.ts3500.doc/ ts3500_ichome.html The Advanced Library Management System (ALMS) provides enhanced flexibility and  capabilities for partitioning the TS3500 tape library. ALMS virtualizes the SCSI element  addresses while maintaining the approach of the multipath architecture and the use of SCSI-3  Medium Changer commands. Without ALMS, everything is based on the SCSI element  address (location-centric), and partitioning is based on real cartridge slots and drive slots.  With ALMS, there is no affinity between a real slot address and a SCSI element address that  is reported to the server and used by the server. Instead, there is now an affinity with the  VOLSER (on the bar code label of the cartridge). ALMS eliminates downtime when Capacity-on-Demand storage is added, logical libraries are  added or removed, or logical library storage allocation is altered. ALMS also reduces  downtime when expansion frames are added, tape drives are added or removed, or logical  drive allocation is changed. ALMS offers the following capabilities on the TS3500 tape library: 408  IBM Tape Library Guide for Open Systems GLYPH<SM590000> Dynamic partitioning: – Storage slot pooling – Flexible drive assignment GLYPH<SM590000> Add and remove physical storage capacity that is not apparent to any host application GLYPH<SM590000> Configure drives or L xx  storage capacity without taking the library offline GLYPH<SM590000> Virtualize I/O slots to automatically manage the movement of cartridges between I/O  station slots and storage slots