Preventive Service Planning
Abstract
This document lists the configuration limits and restrictions specific to IBM Spectrum Virtualize for Public Cloud software version 8.4.3.x.
Content
Only the Azure release of IBM Spectrum Virtualize for Public Cloud is supported by v8.4.3.
Note: v8.4.3 is a Non-Long Term Support (Non-LTS) release. Non-LTS code levels are not intended to receive any PTFs. If issues are encountered the only resolution is likely to be an upgrade to a later LTS or Non-LTS release.
Features not supported
The following features are not supported by the v8.4.3 release:
- Real Time Compression
- Encryption
- Stretched Cluster
- HyperSwap
- DRAID
- NPIV
- Hot Spare Node
Supported Host Operating Systems
The following host operating systems are supported:
- Microsoft Windows 2019/2016;
- RHEL 8.4/8.2;
- SUSE 15.3;
- Ubuntu 20.04
Azure VMs
Only the following VMs are supported on Azure:
|
Model
|
vCPU
|
Memory (GiB)
|
Max number of data disks
|
Network Bandwidth (Gbps)
|
|---|---|---|---|---|
|
Standard_D16s_v3
|
16
|
64
|
31
|
8
|
|
Standard_D32s_v3
|
32
|
128
|
31
|
16
|
|
Standard_D64s_v3
|
64
|
256
|
31
|
30
|
Data Reduction Pools
The following restrictions apply for Data Reduction Pools (DRP):
- Child pools are not supported in a DRP;
- 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.
IPv6
IPv6 addresses are not supported. Only IPv4 addresses can be used.
Quorum
Only IP Quorum devices are supported.
Maximum Configurations
Configuration limits for Spectrum Virtualize for Public Cloud:
|
Property
|
Cloud Vendor
|
Maximum Limit
|
Comments
|
|---|---|---|---|
|
System (Cluster) Properties
|
|||
| Nodes per system (cluster) |
2
|
||
| I/O groups per system |
1
|
||
| Inter-cluster partnerships per system |
3
|
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 |
31
|
The maximum number of logical units which can be managed by a cluster. MDisks are provisioned by Azure Storage. |
|
| Managed disks per storage pool (managed disk group) |
31
|
||
| Storage pools per system |
1024
|
||
| Parent pools per system |
128
|
||
| Child pools per system |
1023
|
||
| Managed disk extent size |
8192 MB
|
||
| Capacity for an individual internal managed disk (Azure Managed Disk) |
32 TB
|
Azure Managed Disk limit | |
| Total storage capacity manageable per system |
992TB
|
||
|
Volume (Virtual Disk) Properties
|
|||
| Basic volumes (VDisks) per system |
15864
|
Each basic volume uses 1 VDisk, each with one copy. | |
| Volumes per I/O group (volumes per caching I/O group) |
15864
|
||
| Volumes accessible per I/O group |
15864
|
||
| 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 |
992 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 |
992 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 |
15864
|
The maximum number of volumes cannot all have the maximum number of copies | |
| Total mirrored volume capacity per I/O group |
496 TB
|
||
|
Host Properties
|
|||
| Host objects (IDs) per system |
2048
|
||
| Host objects (IDs) per I/O group |
256
|
||
| 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 |
512
|
||
| iSCSI hosts per I/O group |
512
|
||
| iSCSI names per host object |
4
|
||
| 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. | |
| 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 |
992 TB
|
This limit is the total capacity for all master and auxiliary volumes in the I/O group. (Due to Azure Managed Disk limit) | |
| 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 |
15864
|
||
| 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 |
992 TB
|
||
|
IP Partnership Properties
|
|||
| Inter-cluster IP partnerships per system |
3
|
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 |
1
|
||
| 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 | |
|
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
|
||
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.
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Document Information
Modified date:
24 May 2022
UID
ibm16518974