IBM Flex System V7000 Expansion Enclosure 4939H29 Manuel D’Utilisation
Codes de produits
4939H29
Chapter 2. Introduction to IBM Flex System V7000 Storage Node
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Draft Document for Review January 29, 2013 12:52 pm
8068ch02-HW Intro.fm
Use the same extent size for all storage pools in a storage system, when they are supporting
volume migration between two storage pools. If the storage pool extent sizes are not the
same, use volume mirroring to copy volumes between storage pools, as described in
Chapter 10, “Volume Mirroring and Migration” on page 423.
volume migration between two storage pools. If the storage pool extent sizes are not the
same, use volume mirroring to copy volumes between storage pools, as described in
Chapter 10, “Volume Mirroring and Migration” on page 423.
For most IBM Flex System V7000 Storage Nodes, a maximum of capacity of 1 PB is
sufficient; and an extent size value of 256 MB should be used.
sufficient; and an extent size value of 256 MB should be used.
A storage pool can have a threshold warning set that automatically issues a warning alert
when the used capacity of the storage pool exceeds the set limit.
when the used capacity of the storage pool exceeds the set limit.
Single-tiered storage pool
MDisks that are used in a single-tiered storage pool should have the following characteristics
to prevent performance and other problems:
to prevent performance and other problems:
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They should have the same hardware characteristics, disk type, disk size and disk speeds
(revolutions per minute (rpms)).
(revolutions per minute (rpms)).
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They should have the same RAID type, RAID array size, and disk spindle count in the
RAID grouping.
RAID grouping.
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The disk subsystems providing the MDisks must have similar characteristics, for example,
maximum input/output operations per second (IOPS), response time, cache, and
throughput.
maximum input/output operations per second (IOPS), response time, cache, and
throughput.
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When possible, make all MDisks of the same size, and ensure that the MDisks provide the
same number of extents per volume. If this configuration is not feasible, you need to check
the distribution of the volumes’ extents in that storage pool.
same number of extents per volume. If this configuration is not feasible, you need to check
the distribution of the volumes’ extents in that storage pool.
Multitiered storage pool
A multitiered storage pool has a mix of MDisks with more than one type of disk tier attribute,
for example, a storage pool containing a mix of generic_hdd AND generic_ssd MDisks.
for example, a storage pool containing a mix of generic_hdd AND generic_ssd MDisks.
A multitiered storage pool contains MDisks with different characteristics as opposed to the
single-tiered storage pool. However, each tier should have MDisks of the same size and
MDisks that provide the same number of extents.
single-tiered storage pool. However, each tier should have MDisks of the same size and
MDisks that provide the same number of extents.
A multitiered storage pool is used to enable automatic migration of extents between disk tiers
using the IBM Flex System V7000 Storage Node Easy Tier function. Figure 2-14 on page 64
shows these components.
using the IBM Flex System V7000 Storage Node Easy Tier function. Figure 2-14 on page 64
shows these components.
Default extent size: The GUI of IBM Flex System V7000 Storage Node sets a default
extent size value of 256 MB when you define a new storage pool.
extent size value of 256 MB when you define a new storage pool.