Iscsi Security; Stable Operation Via Load Control; Quality Of Service (Qos); Figure 69 Qos - Fujitsu ETERNUS DX100 S4 Design Manual
Hybrid storage systems
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- Basic operation manual (122 pages) ,
- Site planning manual (57 pages) ,
- Configuration manual (78 pages)
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3.
SAN Functions
Stable Operation via Load Control
iSCSI Security
For an iSCSI interface, the iSCSI authentication function can be used when the initiator accesses the
target. The iSCSI authentication function is available for host connections and remote copying.
The Challenge Handshake Authentication Protocol (CHAP) is supported for iSCSI authentication.
For CHAP Authentication, unidirectional CHAP or bidirectional CHAP can be selected. When unidir-
ectional CHAP is used, the target authenticates the initiator to prevent fraudulent access. When bi-
directional CHAP is used, the target authenticates the initiator to prevent fraudulent access and the
initiator authenticates the target to prevent impersonation.
Note that the Internet Storage Name Service (iSNS) is also supported as an iSCSI name resolution.
Stable Operation via Load Control
Quality of Service (QoS)
●
QoS
The performance of a high priority server is guaranteed by configuring the performance limit of
each connected server.
When the load from one application is high in a storage integrated environment and sufficient re-
sources to process other operations cannot be secured, performance may be reduced.
The QoS function guarantees performance by limiting resources for applications with a low priority
so that resources are secured for high priority applications.
16 priority levels of bandwidth limits (maximum performance limits) can be configured on the
hosts, CA ports, volumes, and LUN groups. The performance configuration patterns of the band-
width limit can be individually changed via ETERNUS CLI.
In addition, scheduled operations (when setting a bandwidth limit for hosts, CA ports, and LUN
groups) are possible by setting a duration using ETERNUS CLI.
Linking with ETERNUS SF Storage Cruiser significantly reduces the operation workload on the sys-
tem administrator when applying the QoS function because performance designing and tuning are
automatically performed.
Figure 69 QoS
Server A
Server B
Low priority
High priority
ETERNUS DX
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
When QoS is not applied
Processing requests
from A increase
Server A
Required performance for A
Affects the performance of B
Server B
Required performance for B
I/O performance
Because the workload for A, which has a low
priority, significantly increases, the required
performance for B cannot be maintained
122
Copyright 2023 Fujitsu Limited
When QoS is applied
The workload does not
exceed the upper limit even
Server A
when processing requests
from A increase
Workload upper limit for A
Server B
High
I/O performance
Because the workload for A is lower than the
upper limit, the workload for B, which has a
high priority, can be reduced
Workload upper limit for B
High
P3AM-7642-32ENZ0
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