Explore the advantages of DAS and SAN
DAS and SAN are the most common options to provide the storage capacity needed for Power Systems. While both solutions provide exceptional storage capabilities, each has its advantages. Businesses can utilize either one or both of these storage solutions with Power Systems.
Direct Attached Storage (DAS)
DAS solutions are presented to the operating system as drives and are located in the system unit or in I/O drawers attached to the system unit. Offering the lowest latency storage option, they can also employ high-performance adapters with write cache to augment performance if needed. DAS solutions may also provide the lowest cost hardware configuration.
A full set of protection options such as RAID 0, 5, 6, 10, and system mirroring can safeguard against the possibility of drive failure. In addition, the Power System operating systems and backup/recovery applications are available for data center activities. Internal drives are often the lower cost option from a single server perspective and/or for a server which has a modest number of drives.
Power Systems offers three types of direct attached flash storage:
By assigning frequently accessed data to the direct attached flash/SSD, performance can be significantly improved.
Storage Area Network (SAN) Attached Storage
IBM Systems Storage SAN solutions enable sharing of data across multiple servers, with enterprise class data protection, reliability, and flexibility. Supporting multiple servers, even heterogeneous servers, IBM System Storage can reduce overall storage costs and provide a single management interface. IBM System Storage can enhance the ability to adjust storage configurations to the meet the changing needs of your business. SAN-attached storage systems also support Power Systems Live Partition Mobility. IBM System Storage offers the capability to combine SSD and HDD within the Storage system and IBM Easy Tier software that can automatically place frequently accessed data onto SSD. SAN are attached to Power Systems via a Fibre Channel connection and often in combination with a Fibre Channel switch.
IBM offers two basic types of SAN attached flash solutions: IBM FlashSystem and hybrid storage solutions from IBM Systems Storage. IBM FlashSystem offers the best possible latency of the IBM SAN-attached options and is well suited for applications requiring excellent I/O performance such as OLTP and real-time databases. IBM FlashSystem can be combined with the IBM SAN Volume Controller (SVC) or Storwize V7000 to deliver enterprise SAN functionality and high performance flash in an integrated SAN environment.
IBM FlashSystem can also be attached to Power servers directly through a Fibre Channel card. It is well suited for environments that do not need advanced SAN functions. Elimination of switches and SAN components can also reduce expenses.
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