• USA : +1 973 910 5725
  • INDIA: +91 905 291 3388
  • info@tekslate.com
  • Login

Storage in VMware

STORAGE in VMware

In enterprises, the data is stored on a separate storage device.

The DAS, NAS and the SAN technologies implemented to store the data. Let us briefly understand DAS, NAS and SAN.

The different Storage technologies are :

-DAS.

-Fiber channel.

Fiber channel over Ethernet.

-Network Area Storage

-ISCSI.

DAS: Direct Attached Storage. Storage (usually disk or tape) is directly attached by a cable to the computer processor. (The hard drive inside a PC or a tape drive attached to a single server is simple a type of DAS.) I/O requests (also called protocols or commands) access devices directly.

Example: ESX1, ESX2 servers in the data center of Kernel Technologies

SAN: Storage Area Network. Storage resides on a dedicated network. Like DAS, I/O requests access devices directly. Today, most SANs use Fiber Channel media, providing any-to-any connection for processors and storage on that network. Ethernet media using an I/O protocol called iSCSI is promising.

Example: the EMC storage in the data center of Kernel Technologies

NAS: Network Attached Storage. A NAS device (“appliance”), usually an integrated processor plus disk storage, is attached to a TCP/IP-based network (LAN or WAN), and accessed using specialized file access/file sharing protocols. File requests received by a NAS are translated by the internal processor to device requests.

Example: the NetApp storage in the data center of Kernel Technologies The term host bus adapter (HBA) is most often used to refer to a Fibre Channel interface card; each HBA has a unique World Wide Name (WWN), which is similar to an Ethernet MAC address. The major Fibre Channel HBA manufacturers are QLogic and Emulex. HBA is also known to be interpreted as High Bandwidth Adapter in cases of Fibre Channel controllers.

Storage Policys are : Fixed (Fixed), Most Recently Used (MRU), Round Robin (RR).

Most Recently Used (MRU) — Selects the first working path, discovered at system boot time. If this path becomes unavailable, the ESX/ESXi host switches to an alternative path and continues to use the new path while it is available. This is the default policy for Logical Unit Numbers (LUNs) presented from an Active/Passive array. ESX/ESXi does not return to the previous path when if, or when, it returns; it remains on the working path until it, for any reason, fails.

Fixed (Fixed) — Uses the designated preferred path flag, if it has been configured. Otherwise, it uses the first working path discovered at system boot time. If the ESX/ESXi host cannot use the preferred path or it becomes unavailable, ESX/ESXi selects an alternative available path. The host automatically returns to the previously-defined preferred path as soon as it becomes available again. This is the default policy for LUNs presented from an Active/Active storage array.

Round Robin (RR) — Uses an automatic path selection rotating through all available paths, enabling the distribution of load across the configured paths For Active/Active storage arrays, all paths will used in the Round Robin policy. For Active/Passive storage arrays, only the paths to the active controller will used in the Round Robin policy.

Notes: Round Robin is not supported on all storage arrays. We need to check with the array documentation or storage vendor to see if Round Robin is supported and/or recommended for the array and configuration. Switching to a unsupported or undesirable pathing policy can result in connectivity issues to the LUNs (worst case if can cause an outage).

Capture.703

Capture.704

Capture.705

Capture.707

Capture.708

Capture.709

Capture.710

Capture.711

Capture.712

Capture.713

Capture.714

Capture.715

Capture.716

Desired to gain proficiency on VMware? Explore the blog post on VMware training Online to become a pro in VMware.

Capture.717

Capture.718

Capture.719

Capture.720

Capture.720

Capture.721

Capture.722

Capture.723

Capture.724

Capture.725

Capture.726

Capture.727

Capture.728

Capture.729

Capture.730

Capture.731

Capture.732

Capture.733

Capture.734

Capture.735

Capture.736

Capture.737

Capture.738

Capture.739

Capture.740

Capture.741

Capture.742

Capture.743

Capture.744

Capture.745

For indepth understanding of VMware click on

Summary
Review Date
Reviewed Item
Storage in VMware
Author Rating
4

“At TekSlate, we are trying to create high quality tutorials and articles, if you think any information is incorrect or want to add anything to the article, please feel free to get in touch with us at info@tekslate.com, we will update the article in 24 hours.”

0 Responses on Storage in VMware"

Leave a Message

Your email address will not be published. Required fields are marked *

Site Disclaimer, Copyright © 2016 - All Rights Reserved.