IBM Spectrum Scale integrates with the IBM FlashSystem 900 Model AE3 and offers your  business environment the following potential benefits: In this scenario, IBM Spectrum Scale and DataDirect Networks (DDN) communicate by using  the same SCSI RDMA SRP, which is supported by the IBM FlashSystem 900 Model AE3.  SRP is similar to iSCSI protocol. SRP provides access to LUNs across networks, and SRP  protocol is used across InfiniBand networks. GPFS was historically implemented by using  SRP protocols to access DDN disk subsystems from GPFS Network Shared Disks (NSD)  servers. IBM FlashSystem 900 Model AE3 supports VMware vSphere Storage APIs - Array  Integration (VAAI) UNMAP function and VMware vSphere API for Storage Awareness (VASA)  through integration with the IBM Spectrum Connect. IBM FlashSystem 900 Model AE3 supports the VAAI Block Reclaim/UNMAP primitive to  inform the FlashSystem 900 Model AE3 to reclaim storage. Other VAAI primitives are not  supported. In particular, the Atomic Test and Set (ATS) API of VMware is not supported, and  to avoid unnecessary SCSI reservation conflicts and performance impacts, this feature must  be disabled your VMware configuration. 2.5.5 VMware with IBM Spectrum Connect  GLYPH<SM590000> IBM Spectrum Scale is used at many sites where InfiniBand is used. IBM Spectrum Scale  and InfiniBand are a good match for the IBM FlashSystem 900 Model AE3.  GLYPH<SM590000> IBM Spectrum Scale can perform mirroring of two FlashSystem 900 Model AE3s, at a  single site or across multiple sites. GLYPH<SM590000> This integration provides the capability to replicate data sync or async to another site. It  also supports full active-active two-site configurations (sync replication only). GLYPH<SM590000> A small part of a the IBM FlashSystem can be partitioned for metadata use and the  remainder can be used for hot data. GLYPH<SM590000> You can use the IBM FlashSystem to support data, metadata, or both. It also can support  millions of file creations and deletions per minute. GLYPH<SM590000> IBM Spectrum Scale enables the IBM FlashSystem to be used as a storage  tier  under  user control, scheduled control, or dynamically, where files are moved to and from flash  and disk (and even tape) under policy control or when they are used. Chapter 2. IBM FlashSystem 900 Model AE3 architecture  71