Preventive Service Planning
Abstract
This document lists the configuration limits and restrictions specific to IBM Spectrum Virtualize for Public Cloud software version 8.3.1.x
Content
Features not supported
The following features are not supported by the v8.3.1 release:
- Real Time Compression
- Encryption
- Stretched Cluster
- HyperSwap
- DRAID
- NPIV
- Software-based compression (on IBM Cloud)
- Deduplication (on AWS c5.4xlarge only)
- Hot Spare Node
IBM Cloud
Only the following CPU models in the dual-processor servers are supported on IBM Cloud:
|
CPU Model
|
|---|
|
Intel Xeon E5-2620
|
|
Intel Xeon E5-2650
|
|
Intel Xeon E5-5120
|
Multiple Availability Zones are not supported.
AWS
Only the following EC2 instances are supported on AWS:
|
Model
|
vCPU
|
Memory (GiB)
|
Instance Storage (GiB)
|
Network Bandwidth (Gbps)
|
Dedicated EBS Bandwidth (Mbps)
|
|---|---|---|---|---|---|
|
c5.4xlarge
|
16
|
32
|
EBS-only
|
Up to 10
|
4,750
|
|
c5.9xlarge
|
36
|
72
|
EBS-only
|
10
|
9,500
|
|
c5.18xlarge
|
72
|
144
|
EBS-only
|
25
|
19,000
|
Multiple Availability Zones are not supported.
Data Reduction Pools
The following restrictions apply for Data Reduction Pools (DRP):
- Child pools are not supported in a DRP;
- VVOL is not supported in a DRP (because child pool is not supported);
- A volume in a DRP cannot be shrunk;
- No volume move between I/O groups if volume in a DRP (use FlashCopy or Metro Mirror/Global Mirror instead);
- No split of a volume mirror to copy in a different I/O group;
- Real/used/free/free/tier capacity are not reported per volume - only per pool.
Note: These restrictions are applicable to all the versions of IBM Spectrum Virtualize v8.1.2 and later
REST API
Customers using the REST API to list more than 2000 objects may experience a loss of service, from the API, as it restarts due to memory constraints.
IPv6
IPv6 addresses are not supported. Only IPv4 addresses can be used.
Quorum
Only IP Quorum devices are supported.
VMware vSphere Virtual Volumes (VVols)
The maximum number of Virtual Machines on a single VMware ESXi host in an VVol storage configuration is limited to 680.
Oracle
|
Oracle Version and OS
|
Restrictions that apply:
|
| Oracle Release 11.2 any platform |
1
|
| Oracle Release 12.1 any platform |
Restriction 1:
Oracle ASM disk groups may dismount with the following error:
"Waited 15 secs for write IO to PST"
Recommendation:
Increase the asm_hbeatiowait to 120 seconds to prevent this issue occurring.
Applies to Oracle Database - Enterprise Edition - Version 11.2.0.3 to 12.1.0.1 [Release 11.2 to 12.1] on any platform
Maximum Configurations
Configuration limits for Spectrum Virtualize for Public Cloud:
|
Property
|
Cloud Vendor
|
Maximum Limit
|
Comments
|
|---|---|---|---|
|
System (Cluster) Properties
|
|||
| Nodes per system (cluster) |
IBM
|
8
|
Arranged as two I/O groups |
|
AWS
|
4
|
||
| I/O groups per system |
IBM
|
4
|
Each containing two nodes |
|
AWS
|
2
|
||
| Inter-cluster partnerships per system |
3
(maximum 1 IP partnership is supported) |
A system may be partnered with up to three remote systems. No more than four systems may be in the same connected set | |
| IP Quorum devices per system |
5
|
||
|
Node Properties
|
|||
| iSCSI sessions per node |
1024
|
2048 in IP failover mode (when partner node is unavailable). This limit includes both iSCSI Host Attach AND iSCSI Initiator sessions |
|
|
Managed Disk Properties
|
|||
| Managed disks (MDisks) per system |
IBM
|
4096
|
The maximum number of logical units which can be managed by a cluster. Internal distributed arrays consume 16 logical units. This number includes external MDisks which have not been configured into storage pools (managed disk groups) |
| Elastic Block Stores (EBS) per IO group |
AWS
|
20
|
Maximum of 320TB backend storage. |
| Managed disks per storage pool (managed disk group) |
IBM
|
128
|
Internal distributed arrays consume 16 logical units. |
| Storage pools per system |
IBM
|
1024
|
|
| Parent pools per system |
128
|
||
| Child pools per system |
1023
|
||
| Managed disk extent size |
8192 MB
|
||
| Capacity for an individual internal managed disk (array) |
1 PB
|
No limit is imposed beyond the maximum number of drives per array limits. Maximum size is dependent on the extent size of the Storage Pool. Comparison Table: Maximum Volume, MDisk and System capacity for each extent size. |
|
| Total storage capacity manageable per system |
IBM
|
32 PB
|
Maximum requires an extent size of 8192 MB to be used This limit represents the per system maximum of 2^22 extents. Maximum size is dependent on the extent size of the Storage Pool. Comparison Table: Maximum Volume, MDisk and System capacity for each extent size. |
|
AWS
|
256TB
|
||
|
Volume (Virtual Disk) Properties
|
|||
| Basic volumes (VDisks) per system |
10000
|
Each basic volume uses 1 VDisk, each with one copy. | |
| Volumes per I/O group (volumes per caching I/O group) |
10000
|
||
| Volumes accessible per I/O group |
10000
|
||
| Thin-provisioned (space-efficient) volume copies per system |
-
|
No limit is imposed here beyond the volume copies per system limit. | |
| Volumes per storage pool |
-
|
No limit is imposed beyond the volumes per system limit | |
| Fully-allocated volume capacity |
256 TB
|
Maximum size for an individual fully-allocated volume. Maximum size is dependent on the extent size of the Storage Pool. Comparison Table: Maximum Volume, MDisk and System capacity for each extent size. |
|
| Thin-provisioned (space-efficient) volume capacity |
256 TB
|
Maximum size for an individual thin-provisioned volume Maximum size is dependent on the extent size of the Storage Pool. Comparison Table: Maximum Volume, MDisk and System capacity for each extent size. |
|
| Host mappings per system |
20,000
|
See also - volume mappings per host object below | |
|
Mirrored Volume (Virtual Disk) Properties
|
|||
| Copies per volume |
2
|
||
| Volume copies per system |
10000
|
The maximum number of volumes cannot all have the maximum number of copies | |
| Total mirrored volume capacity per I/O group |
1024 TB
|
||
|
Host Properties
|
|||
| Host objects (IDs) per system |
2048
|
||
| Host objects (IDs) per I/O group |
512
|
||
| Volume mappings per host object |
2048
|
Although SV allows the mapping of up to 2048 volumes per host object, not all hosts are capable of accessing/managing this number of volumes. The practical mapping limit is restricted by the host OS, not SV.
Note: this limit does not apply to hosts of type adminlun (used to support VMware vvols). |
|
|
Host Cluster Properties
|
|||
| Host clusters per system |
512
|
||
| Hosts in a host cluster |
128
|
||
|
iSCSI Host Properties
|
|||
| iSCSI hosts per system |
2048
|
||
| iSCSI hosts per I/O group |
512
|
||
| iSCSI names per host object |
8
|
||
| iSCSI names per I/O group |
512
|
||
|
Copy Services Properties
|
|||
| Remote Copy (Metro Mirror and Global Mirror) relationships per system |
10000
|
This can be any mix of Metro Mirror and Global Mirror relationships. Maximum requires an 8-node cluster |
|
| Remote Copy relationships per consistency group |
-
|
No limit is imposed beyond the Remote Copy relationships per system limit. Refer to the Changes to support for Global Mirror with Change Volumes page for information relating to GMCV performance considerations and best practice. |
|
| Remote Copy consistency groups per system |
256
|
||
| Total Metro Mirror and Global Mirror volume capacity per I/O group |
1024 TB
|
This limit is the total capacity for all master and auxiliary volumes in the I/O group. | |
| Total number of Global Mirror with Change Volumes relationships per system |
256
|
Change volumes used for active-active relationships do not count towards this limit. | |
| FlashCopy mappings per system |
5000
|
||
| FlashCopy targets per source |
256
|
||
| FlashCopy mappings per consistency group |
512
|
||
| FlashCopy consistency groups per system |
500
|
||
| Total FlashCopy volume capacity per I/O group |
4096 TB
|
||
|
IP Partnership Properties
|
|||
| Inter-cluster IP partnerships per system |
1
|
A system may be partnered with up to three remote systems. A maximum of one of those can be IP. | |
| I/O groups per system |
2
|
The nodes from a maximum of two I/O groups per system can be used for IP partnership. | |
| Inter site links per IP partnership |
2
|
A maximum of two inter site links can be used between two IP partnership sites. | |
| Ports per node |
1
|
A maximum of one port per node can be used for IP partnership. | |
|
External Storage System Properties
|
|||
| LUNs (managed disks) per storage system |
-
|
No limit is imposed beyond the available max size of IBM Cloud Block Storage | |
|
System and User Management Properties
|
|||
| User accounts per system |
400
|
Includes the default user accounts | |
| User groups per system |
256
|
Includes the default user groups | |
| Authentication servers per system |
1
|
||
| NTP servers per system |
1
|
||
| iSNS servers per system |
1
|
||
| Concurrent open SSH sessions per system |
32
|
||
|
Event Notification Properties
|
|||
| SNMP servers per system |
6
|
||
| Syslog servers per system |
6
|
||
| Email (SMTP) servers per system |
6
|
Email servers are used in turn until the email is successfully sent | |
| Email users (recipients) per system |
12
|
||
| LDAP servers per system |
6
|
||
|
REST API Properties
|
|||
| Threads per session |
64
|
||
| HTTP header size |
16 KB
|
||
| Objects per response |
2000
|
||
Extents
The following table compares the maximum volume, MDisk and system capacity for each extent size.
|
Extent size (MB)
|
Maximum non thin-provisioned volume capacity in GB
|
Maximum thin-provisioned volume capacity in GB
|
Maximum MDisk capacity in GB
|
Maximum DRAID Mdisk capacity in TB
|
Total storage capacity manageable per system*
|
|
16
|
2048 (2 TB)
|
2000
|
2048 (2 TB)
|
32
|
64 TB
|
|
32
|
4096 (4 TB)
|
4000
|
4096 (4 TB)
|
64
|
128 TB
|
|
64
|
8192 (8 TB)
|
8000
|
8192 (8 TB)
|
128
|
256 TB
|
|
128
|
16,384 (16 TB)
|
16,000
|
16,384 (16 TB)
|
256
|
512 TB
|
|
256
|
32,768 (32 TB)
|
32,000
|
32,768 (32 TB)
|
512
|
1 PB
|
|
512
|
65,536 (64 TB)
|
65,000
|
65,536 (64 TB)
|
1024 (1 PB)
|
2 PB
|
|
1024
|
131,072 (128 TB)
|
130,000
|
131,072 (128 TB)
|
2048 (2 PB)
|
4 PB
|
|
2048
|
262,144 (256 TB)
|
260,000
|
262,144 (256 TB)
|
4096 (4 PB)
|
8 PB
|
|
4096
|
262,144 (256 TB)
|
262,144
|
524,288 (512 TB)
|
8192 (8 PB)
|
16 PB
|
|
8192
|
262,144 (256 TB)
|
262,144
|
1,048,576 (1024 TB)
|
16384 (16 PB)
|
32 PB
|
* The total capacity values assumes that all of the storage pools in the system use the same extent size.
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STHLEK","label":"IBM Spectrum Virtualize for Public Cloud"},"Component":"","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.3","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]
Was this topic helpful?
Document Information
Modified date:
24 May 2022
UID
ibm13369399