[ Pobierz całość w formacie PDF ]
On installing the Red Hat Storage Server from an ISO or PXE, the kexec-tools package for the
kdump service gets installed by default. However, the crashkernel=auto kernel parameter
required for reserving memory for the kdump kernel, is not set for the current kernel entry in the
bootloader configuration file, /boot/grub/grub.conf. Therefore the kdump service fails to
start up with the following message available in the logs.
kdump: No crashkernel parameter specified for running kernel
Workaround: After installing the Red Hat Storage Server, the crashkernel=auto, or an
appropriate crashkernel=M kernel parameter can be set manually for the current kernel
in the bootloader configuration file. After that, the Red Hat Storage Server system must be
rebooted, upon which the memory for the kdump kernel is reserved and the kdump service starts
successfully. Refer to the following link for more information on Configuring kdump on the
Command Line
Additional information: On installing a new kernel after installing the Red Hat Storage Server,
the crashkernel=auto kernel parameter is successfully set in the bootloader configuration file
for the newly added kernel.
18
Chapter 4. Technology Previews
Chapter 4. Technology Previews
This chapter provides a list of all available Technology Preview features in Red Hat Storage 2.1.
Technology Preview features are currently not supported under Red Hat Storage subscription services,
may not be functionally complete, and are generally not suitable for production use. However, these
features are included as a customer convenience and to provide the feature with wider exposure.
Customers may find these features useful in a non-production environment. Customers are also free to
provide feedback and functionality suggestions for a Technology Preview feature before it becomes fully
supported. Errata will be provided for high-severity security issues.
During the development of a Technology Preview feature, additional components may become available
to the public for testing. It is the intention of Red Hat to fully support Technology Preview features in a
future release.
4.1. Red Hat Storage Console
Red Hat Storage Console is a powerful and simple web based Graphical User Interface for managing a
Red Hat Storage 2.1 environment. It helps Storage Administrators to easily create and manage multiple
storage pools. This includes features like elastically expanding or shrinking a cluster, creating and
managing volumes.
For more information, refer to Red Hat Storage 2.1 Console Administration Guide.
4.2. Striped Volumes
Striped volumes stripes data across bricks in the volume. Use striped volumes only in high concurrency
environments accessing very large files is critical.
For more information, refer to section Creating Striped Volumes in the Red Hat Storage 2.1
Administration Guide.
4.3. Distributed-Striped Volumes
The distributed striped volumes stripe data across two or more nodes in the trusted storage pool. Use
distributed striped volumes to scale storage and to access very large files during critical operations in
high concurrency environments.
For more information, refer to section Creating Distributed Striped Volumes in the Red Hat Storage 2.1
Administration Guide.
4.4. Distributed-Striped-Replicated Volumes
Distributed striped replicated volumes distributes striped data across replicated bricks in a trusted
storage pool. Use distributed striped replicated volumes in highly concurrent environments where there
is parallel access of very large files and performance is critical. Configuration of this volume type is
supported only for Map Reduce workloads.
For more information, refer to the section Creating Distributed Striped Replicated Volumes in the Red Hat
Storage 2.1 Administration Guide.
19
Red Hat Storage 2.1 2.1 Update 1 Release Notes
4.5. Striped-Replicated Volumes
The striped replicated volumes stripe data across replicated bricks in a trusted storage pool. Use
striped replicated volumes in highly concurrent environments where there is parallel access of very large
files and performance is critical. In this release, configuration of this volume type is supported only for
Map Reduce workloads.
For more information, refer to the section Creating Striped Replicated Volumes in the Red Hat Storage
2.1 Administration Guide.
4.6. Replicated Volumes with Replica Count greater than 2
The replicated volumes create copies of files across multiple bricks in the volume. You can use
replicated volumes in environments where high-availability and high-reliability are critical. Creating
replicated volumes with replica count more than 2 is under technology preview.
For more information, refer to the section Creating Replicated Volumes in the Red Hat Storage 2.1
Administration Guide.
4.7. Support for RDMA over Infiniband
Red Hat Storage support for RDMA over Infiniband is a technology preview feature.
4.8. Stopping Remove Brick Operation
You can cancel a remove-brick operation. After executing a remove-brick operation, you can choose to
stop the remove-brick operation by executing the stop command. The files that are already migrated
during remove-brick operation, is not migrated back to the same brick.
For more information, refer to the section Stopping Remove Brick Operation in the Red Hat Storage 2.1
Administration Guide.
4.9. Read-only Volume
Red Hat Storage enables you to mount volumes with read-only permission. While mounting the client,
you can mount a volume as read-only and also make the entire volume as read-only, which applies for all
the clients using the volume set command.
20
Revision History
Revision History
Revision 2.1-20 Mon Dec 30 2013 Pavithra Srinivasan
Updated the known issues chapter.
Revision 2.1-17 Tue Dec 10 2013 Pavithra Srinivasan
Updated the known issues chapter.
Revision 2.1-16 Mon Nov 25 2013 Pavithra Srinivasan
Updated the known issues chapter.
Revision 2.1-8 Wed Nov 20 2013 Pavithra Srinivasan
Second draft for Update 1 release.
Revision 2.1-4 Fri Oct 4 2013 Pavithra Srinivasan
First draft for Update 1 release.
21
[ Pobierz całość w formacie PDF ]