Assign Rec Disk Buffer - Fujitsu ETERNUS DX60 S3 User Manual

Chapter 7 Advanced Copy Management
7.8 REC Management
7.8.8

Assign REC Disk Buffer

This function assigns an REC Disk Buffer to an REC Buffer. This function also deletes the assignment of the REC
Disk Buffers.
Requirements for REC Buffers to assign REC Disk Buffers
• The usage of the REC Buffer must be "Send"
• The number of REC Disk Buffers that is to be assigned to a single REC Buffer must be one of the following
numbers.
- ETERNUS DX100 S3
One or two (but less than or equal to the number of CMs that are installed)
- ETERNUS DX200 S3
One or two
- ETERNUS DX500 S3/DX600 S3
One or two
- ETERNUS DX8700 S3
One, two, or four (but less than or equal to the number of CMs that are installed)
- ETERNUS DX8900 S3
One, two, four, or six (but less than or equal to the number of CMs that are installed)
- ETERNUS DX200F
One or two
• Requirements to assign multiple REC Disk Buffers to a single REC Buffer
- The drive type (Online/Nearline/SSD/Online SED/Nearline SED/SSD SED) must be the same (*1)
- The assigned REC Disk Buffers have the same number of drives (four or eight)
- The assigned REC Disk Buffers have the same encryption status ("CM", "-", or "SED")
• Recommended conditions for assigning multiple REC Disk Buffers to a single REC Buffer
- The assigned REC Disk Buffers have the same Stripe Depth (*2)
- The assigned REC Disk Buffers have the same capacity
- The SSD type (SSD-M/SSD/SSD-M SED) must be the same
*1: "Online" REC Disk Buffers and "Nearline" REC Disk Buffers can be assigned in the same REC Buffer. However, only
assigning either "Online" REC Disk Buffers or "Nearline" REC Disk Buffers is recommended. "Online SED" REC Disk
Buffers and "Nearline SED" REC Disk Buffers can be assigned in the same REC Buffer. However, only assigning either
"Online SED" REC Disk Buffers or "Nearline SED" REC Disk Buffers is recommended. This is because the available
capacity and the access performance may be reduced when these REC Disk Buffers are assigned in the same REC
Buffer.
*2: If the Stripe Depth is different for the used REC Disk Buffers, access performance of the REC Disk Buffer may be
affected.
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