Configuring the Windows software initiators for iSCSI multipathing with iSCSI software Open-E DSS. Part 3: Evaluation of function multipath
Configuring the Windows software initiators for iSCSI multipathing with iSCSI software Open-E DSS. Part 1: Configure the software Open-E DSS for iSCSI target and Multipthing.
A short video tutorial on how you look at a target on globalsan iSCSI initiator iSCSI. Where once the aim has been configured (here: FreeNAS-an implementation easy in a VMware Fusion VM) all you have to do is the initiator software on www.studionetworksolutions.com OS X 10.5 to download the kernel support Missing iSCSI (over 10.4 and 10.6 is said to have / have done when it's installed) and connect to the destination are available. A video guide on how to create an iSCSI target with FreeNAS made available soon!
Configuring the Windows software initiators for iSCSI multipathing with iSCSI software Open-E DSS. Part 2: Configuring the Windows software initiators.
http://www.youtube.com/watch?v=xTG_44e8Gp8&hl=en
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Introduction
Many Microsoft Window applications (like Exchange, MS-SQL, etc) are critical to the daily core functionality for many companies and organizations. Managing the data backup for these applications presents new challenges for system administrators. While there is an ever increasing need for more and more data to be backed up, at the same time the system administrator must cope with the issue of shrinking backup windows in which the application can be taken offline in order to backup the application data. Another issue to contend with is the performance hit the production server takes when backup is running.
Microsoft Volume Shadow Copy Service (VSS) and SANRAD iSCSI V-Switch acting as VSS storage provider can help the system administrator resolve these issues by:
o Eliminating the need to take the application offline.
o Quickly responding to the increasing need for storage.
o Enabling fast backup and restore by backing up to disks and offloading the backup performance hit from the production volumes and servers.
This application note describes VSS, how it works, the required basic configuration in order for VSS to work with the SANRAD V-Switch to create snapshots as well as the backup design options using VSS and SANRAD V-Switch. We use Veritas’ BackupExec (V10.0) to help us demonstrate taking backups with VSS using SANRAD V-Switch.
This application note assumes that the user has basic knowledge of how to use SANRAD V-Switch to configure volumes and expose them to the servers as disks. The user should also be familiar with Microsoft Iscsi initiator for connecting Windows 2003 server to the exposed iSCSI volumes by the SANRAD V-Switch.
What is VSS?
Microsoft Volume Shadow Copy Service (VSS) provides the backup infrastructure for the Windows Server 2003 operating systems, as well as a mechanism for creating consistent point-in-time copies of data known as shadow copies or snapshots.
VSS can produce consistent snapshots by coordinating between different applications (business, file-system services, backup) and storage hardware.
The following steps describe VSS Architecture:
STEP 1. Path 1: The Requestor (usually a backup application) make a request to VSS (running on the application server) to create snapshots of production volumes so that backups can be made from the snapshots and not from the production volumes.
STEP 2. Path 2: If the volumes “belong” to an application that has a VSS Writer (VSS aware application like Exchange), the VSS requests the Writer to prepare the volumes. The Writer will usually flash the data to the disk and freeze IO writes from the application during the time the VSS takes the snapshots (usually few seconds). This ensures application data consistency when recovery is needed. If there is no VSS writer then VSS will go directly to the next step but there is no guarantee that the data is in a consistent state.
STEP 3. Path 3: VSS requests a provider to create a snapshot. There are three kinds of VSS providers: Hardware, Software and System. A system provider is part of the Windows 2003 OS and it will take snapshots and keep them but only at the OS level. A hardware provider is usually a storage provider, like SANRAD Iscsi V-Switch, which creates and maintains snapshots at the storage hardware level. VSS chooses the provider from a list (first on the list with priority given to hardware provider if one exists).
STEP 4. Path 4: VSS goes back to the VSS Writer (if it exists) and allows it to unfreeze the application I/O activity and resume normal activity.
STEP 5. Path 5: VSS goes back to the requestor (backup application) and gives it the location of the snapshots so it can start the backup from the snapshots.
STEP 6. Path 6: Once backup is complete, the requestor informs VSS which in turn informs the VSS provider to delete the snapshots.
Summary
The combined solution of Microsoft Volume Shadow Copy Service (VSS), SANRAD V-Switch as the VSS storage provider and backup VSS aware applications (like Veritas BackupExec V10) allow companies to offload backup jobs from the production environment, leave applications up for user access while backing up the data and have a data life cycle for regulations compliance.
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Short video guide how to log on to an iscsi-Target via the globalsan iscsi-initiator. Once the target has been configured (here: a simple freenas-implementation in a vmware Fusion-VM) all you need to do is to download the initiator-software at www.studionetworksolutions.com as OS X 10.5 lacks iscsi-kernel support (while 10.4 and 10.6 are told to had / have it built in) and connect to the target provided. A video guide how to create an iscsi-target with freenas will be provided soon!
http://www.youtube.com/watch?v=D7RbcrPuC_0&hl=en
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P6A: A Portable iscsi Initiator, Alistair Crooks asiabsdcon 2008
http://www.youtube.com/watch?v=MiZY7PMu7Ic&hl=en
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Konfiguration des Windows iscsi Software Initiators mit Multipathing für ein iscsi Target der Open-E DSS Software. Teil 3: Überprüfung der Multipathing-Funktion
http://www.youtube.com/watch?v=aW2rNdQxpaI&hl=en
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This video walks you through creating a new iscsi LUN on an EMC Celerra and then connecting to it from a Windows system using the Microsoft iscsi initiator.
http://www.youtube.com/watch?v=SVitTOqT_8E&hl=en
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Five Minutes-Screencast where the creation of an iscsi-Share via Openfiler 2.3 is shown based upon Mac OS X 10.5 and Firefox 3.5.1 – after successfull creation a new drive is mapped to the desktop via globalsan iscsi Initiator which is similar to the process on Windows via the Microsoft iscsi-initiator or other derivates. iscsi as easy as iscsi can be!
http://www.youtube.com/watch?v=ik3I-n0jlMQ&hl=en
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