HP D2D4009fc HP D2D Backup Systems Best practices for VTL, NAS and Replication - Page 26
Maximum slots MSL2024, MSL4048, D2D400X G1
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cartridges that can be configured per library has also increased compared to G1 products. The table below lists the key parameters for both G1 and G2 products. To achieve best performance the recommended maximum concurrent backup streams per library and appliance in the table should be followed. As an example, while it is possible to configure 40 drives per library on a 4312 appliance, for best performance no more than 12 of these drives should be actively writing or reading at any one time. Maximum VTL drives per library Maximum slots per library (D2DBS) Maximum slots (MSL2024, MSL4048, MSL8096) Recommended maximum concurrent backup streams per appliance Recommended maximum concurrent backup streams per library D2D2502 G1 D2D2503 G1 D2D2504 G1 D2D400X G1 4 1 4 4 48 48 48 96 24, 48, 96 24, 48, 96 24, 48, 96 24, 48, 96 16 8 24 12 4 4 4 4 D2D4112 G1 4 144 24, 48, 96 24 4 Maximum VTL drives per library/appliance Maximum slots per library (D2DBS, EML-E, ESL-E) Maximum slots (MSL2024, MSL4048, MSL8096) Maximum active streams per store Recommended maximum concurrent backup streams per appliance Recommended maximum concurrent backup streams per library D2D2502 G2 16 96 24, 48, 96 32 16 4 D2D2504 G2 32 96 24, 48, 96 48 24 4 D2D4106/4112 G2 64/96 1024 24, 48, 96 64/96 48 6 D2D4312/4324 G2 200 4096 24, 48, 96 128 64 12 The HP D2DBS emulation type and the ESL/EML type, supported on the G2 product family with code revision 2.1 onwards, provide the most flexibility in numbers of cartridges and drives. This has two main benefits: It allows for more concurrent streams on backups which are throttled due to host application throughput, such as multi-streamed backups from a database. It allows for a single library (and therefore Deduplication Store) to contain similar data from more backups that can run in parallel to increase deduplication ratio. The D2DBS emulation type has an added benefit in that it is also clearly identified in most backup applications as a virtual tape library and so is easier for supportability. It is the recommended option for this reason. There are a number of other limitations from an infrastructure point of view that need to be considered when allocating the number of drives per library. As a general point it is recommended that the number of tape drives per library does not exceed 64 due to the restrictions below: For iSCSI VTL devices a single Windows or Linux host can only access a maximum of 64 devices. A single library with 63 drives is the most that a single host can access. Configuring a single library with more than 63 drives will result in not all devices in the library being seen (which may include the library device). The same limitation could be hit with multiple libraries and fewer drives per library. 26