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The control enclosure can support a combination of up to nine expansion enclosures using a
combination of internal IBM Flex System V7000 Expansion Enclosures (maximum 2) and
external IBM Storwize V7000 Expansion Enclosures (maximum 9) connected through the
SAS2 connection on each of the control canisters. With the additional expansions, you are
capable of up to 240 disks drives; or a maximum capacity of 348 TB per control enclosure.
2.3.1 IBM Flex System V7000 Storage Node capabilities
For a complete and updated list of IBM Flex System V7000 Storage Node configuration limits
and restrictions, see the following website:
http://www-01.ibm.com/support/docview.wss?uid=ssg1S1004114
2.3.2 IBM Flex System V7000 Storage Node functions
The following functions are available with IBM Flex System V7000 Storage Node:
Thin provisioning (no license required):
Traditional fully allocated volumes allocate real physical disk capacity for an entire volume
even if that capacity is never used. Thin-provisioned volumes allocate real physical disk
capacity only when data is written to the logical volume.
Volume mirroring (no license required):
Provides a single volume image to the attached host systems while maintaining pointers to
two copies of data in separate storage pools. Copies can be on separate disk storage
systems that are being virtualized. If one copy is failing, IBM Flex System V7000 Storage
Node provides continuous data access by redirecting I/O to the remaining copy. When the
copy becomes available, automatic re-synchronization occurs.
FlashCopy (included with the base IBM Flex System V7000 Storage Node license):
Provides a volume level point-in-time copy function for any storage being virtualized by
IBM Flex System V7000 Storage Node. This function is designed to create copies for
backup, parallel processing, testing, and development, and have the copies available
almost immediately.
IBM Flex System V7000 Storage Node includes the following FlashCopy functions:
– Full / Incremental copy:
This function copies only the changes from either the source or target data since the
last FlashCopy operation and is designed to enable completion of point-in-time online
backups much more quickly than using traditional FlashCopy.
– Multitarget FlashCopy:
IBM Flex System V7000 Storage Node supports copying of up to 256 target volumes
from a single source volume. Each copy is managed by a unique mapping and, in
general, each mapping acts independently and is not affected by other mappings
sharing the source volume.
– Cascaded FlashCopy:
This function is used to create copies of copies and supports full, incremental, or
nocopy operations.
– Reverse FlashCopy:
This function allows data from an earlier point-in-time copy to be restored with minimal
disruption to the host.
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IBM Flex System V7000 Storage Node Introduction and Implementation Guide
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