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Particularly in the Storwize family of products, the current ~512MiB of bitmap space is insufficient given the size of storage systems. Even a "small" V7000 system, for instance, may have several PiBs of disk. The default settings perform a volume format, which uses mirroring bitmap space during the format. Performing an initial bringup when it may be desired to present the full capacity of the system at once, such as behind an SVC, the amount of memory available requires creating volumes in chunks, even when making all available bitmap space available to mirroring. This can significantly increase deployment time.
Idea priority | High |
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Delivered in 8.4.2 (3Q21)
Please add GEICO to the list of clients requiring this enhancement. Contact me (tmkane@us.ibm.com) for details
This is even more serious after the latest launch of the new 38.4TB FCM 2.0, when a FS9200 is filled up and configured on Hyperswap, its only possible to mirror around 850TB of space, because of bitmap space.
So extend the bitmap, please !!!
This is also true for stretched clusters. The current bitmap space for volume mirroring only allows 2PB of volume copies per IO Group which is far too low for current storage sizes. Please increase.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - Servers and Systems Software
Product family - Storage
Product - IBM System Storage SAN Volume Controller (SVC) / Spectrum Virtualize
Component - Product functionality
Operating system - Other
Source - Storage Technical Client Council
For recording keeping, the previous attributes were:
Brand - Servers and Systems Software
Product family - Storage
Product - Storage TCC - Private Requests
Component - Other
Operating system - Other
Source - Storage Technical Client Council