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--- public:vmware [2019/08/16 14:48]
ronnie.chan [VDDK Backup Mode]
+++ public:vmware [2019/08/16 15:12]
ronnie.chan
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 {{public:ahsay_wiki_vmware_backup_set.png?640}}
+----
 ===== System Architecture =====
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 {{public:ahsay_wiki_module_vmware_system_architecture.png?800}}
+----
 ===== Instant VM Restore with Run Direct =====
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 </code>
 </WRAP>
+----
 ===== Backup Mode =====
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 As there is no need to stream the VM files to the Backup Client Computer for delta generation, backup in VDDK mode will greatly enhance the speed of subsequent backup.
-| Pro    | Faster backup speed for subsequent backups compared to non-VDDK backup, as a result of backing up only the used size of your VM instead of the entire machine to enhance backup efficiency. This also helps with minimizing the storage size requirement and saving storage cost.       |
+| **Pro**    | Faster backup speed for subsequent backups compared to non-VDDK backup, as a result of backing up only the used size of your VM instead of the entire machine to enhance backup efficiency. This also helps with minimizing the storage size requirement and saving storage cost.       |
-| Con    | Require paid license, i.e. VMware Essentials License for usage of vSphere API.     |
+| **Con**    | Require paid license, i.e. VMware Essentials License for usage of vSphere API.     |
+==== Non-VDDK Backup Mode ====
+For VM on VMware host on Enterprise Standard, Enterprise and Enterprise Plus Edition, backup is performed in VDDK mode. Backup in VDDK mode produces a backup chain that consists of a full VDDK file and a set of VDDK incremental files.
+  * During the first backup, full files (e.g. virtual disk file (*.vmdk)) are created in the backup destination.
+  * During subsequent backup, In-file delta - an AhsayOBM feature is employed, to track only data blocks that have change since the last backup.  All changed data blocks are saved as incremental / differential delta files in the backup chain.
+During a subsequent backup in non-VDDK mode, VM files are streamed to the Backup Client Computer, for delta generation:
+| **Pro**    | Free version of ESXi is supported.       |
+| **Con**    | Slower backup speed for subsequent backup compared to VDDK backup, as a result of having the entire VM backed up every time regardless of the actual used size.     |
+==== Comparison between VDDK and Non-VDDK Modes ====
+^       ^ VDDK (CBT)      ^ Non-VDDK          ^
+| **Full Backup**    | Used data size of guest     | Provisioned data size of guest        |
+| **Incremental / Differential**     | Generated by VMware Host using CBT     | Generated by AhsayOBM on the staging machine using in-file delta        |
+| **Storage Size**    | Uses less storage quota     | Uses more storage quota        |
+| **Storage Cost**    | Lower storage cost     | Higher storage cost        |
+| **Backup Speed**    | Faster backup speed due to smaller data size     | Slower backup speed due to larger data size        |
+| **Run Direct Support**    | Yes     | No        |
+| **Restore from VDDK to VMDK format**    | Yes     | No        |
+| **Granular Restore**    | Yes     | Yes        |
+| **AhsayOBM on Windows Platform**    | Yes     | Yes        |
+| **AhsayOBM on Non Windows Platform**    | No     | Yes        |
+----
+===== Requirements =====
+==== Hardware Requirement ====
+  * Refer to this [[public:8000_faq:ahsay_hardware_requirement_list_hrl_for_version_8.1_or_above|Hardware Requirement List]] for the list of hardware requirements for AhsayOBM.
+==== Software Requirement ====
+  * Refer to this [[public:8062_faq:ahsay_scl_for_granular_and_opendirect_restore_v8|Software Compatibility List for Granular Restore]] in VMware backup sets.
+==== Antivirus Exclusion Requirement ====
+  * To optimize performance of AhsayOBM on Windows, and to avoid conflict with your antivirus software, refer to [[public:8014_faq:suggestion_on_antivirus_exclusions|this article]] for the list of processes and directory paths that should be added to all antivirus software white-list / exclusion list.
+<WRAP prewrap>
+<code>
+NOTE
+For AhsayOBM version 8.1 or above, the bJW.exe process is automatically added to Windows Defender exclusion list for Windows 10 and 2016, during installation / upgrade via installer or upgrade via AUA.
+</code>
+</WRAP>
+==== VMware vCenter / ESXi Server Requirements ====
+For backup of virtual machines on vCenter / ESXi servers, make sure the following requirements are met.
+=== ESXi / vCenter Patch Release ===
+Make sure that the latest supported patch release is installed on the vCenter / ESXi hosts to prevent critical issue, such as [[https://kb.vmware.com/kb/2090639|corruption to change tracking data in certain situation]].
+=== License Specification ===
+  * Paid License (VMware Essentials License or above): VMware ESXi and vCenter v5, v5.5, v6 , v6.5 and v6.7
+  * Free License: VMware ESXi v5, v5.5, v6 , v6.5 and v6.7
+=== ESXi Shell Access ===
+  * ESXi Shell access must be enabled on the ESXi servers.  Refer to the following VMware KB article for instruction: [[https://kb.vmware.com/kb/2004746]]
+  * Consult with VMware support representatives if you are unsure on the process.
 ===== Documentation =====

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