最後更新: 2019-09-12

 

目錄

•  
• Multipaht I/O (MPIO)

 

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HP MSA2040

 

Hardware:

• Dual SAS Controller SAN.
• Form factor: 2U
• Port: FC(Fibre Channel) + Ethnernet
• Disk type

只能2選1款 HDD 用

• Small-Form-Factor (SFF) = 2.5" disks X 24 (max.)
• Large-Form-Factor (LFF) = 3.5" disks X 12 (max.)

Cabling:

Both servers have dual HBAs that connect to both controllers.

      /--- C1|Disk ..
Server       |Disk ..
      \--- C2|Disk ..

 

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Fibre Channel

 

Fibre Channel networks can transport SCSI commands and information units using the Fibre Channel Protocol (FCP)

It is designed to not just interoperate with SCSI but with the Internet Protocol (IP) and other protocols.

 

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Shutdown SAN

 

Reboot

Restarting each controller independently should result in the same outcome as a full power cycle

while still maintaining host connectivity.

Step

HPE_MSA2050

1. HOST (Servers) with access to a MSA volume should be gracefully shutdown / dismounted / unmapped

2. Gracefully shutdown both array controllers in a dual controller system

 * flush the controller write cache to the disks

[方法1] SMU:

* User can continue to use the CLI when either or both Storage Controllers are shut down,
   but some information might not be available. (仍然會 ping 到.)

1. In the banner, click the system panel and select Restart System.

2. Select the Shut Down operation, which automatically selects the Storage controller type.

3. Select the controller module to shut down: Controller A, Controller B, or both

[方法2] CLI:

shutdown [a|b|both]

JBOD

JBOD enclosures only need to be powered OFF for routine maintenance.

The JBODs should be powered OFF after the controllers have been shut down.

To power OFF the JBOD enclosures either remove the power cables

 

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Disks Health

 

"System" Menu -> Table Tab

 

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vdisk, volume, pool

 

vdisk / linear disk group

For linear storage, a group of disks with an assigned RAID level is called a vdisk or linear disk group.

When creating the vdisk, all its disks must be the same type - either SAS SSD, enterprise SAS.

A vdisk can contain different models of disks, and disks with different capacities.

(the smallest disk determines the logical capacity of all other disks in the vdisk)

vdisk 與 controller 的 owner 關係

In a single-controller system, all vdisks are owned by that controller.

In a dual-controller system, when a vdisk is created the system automatically assigns the owner

to balance the number of vdisks each controller owns; or, the owner can be selected.

volume

A volume is a logical subdivision of a vdisk and can be mapped to controller host ports for access by hosts

Disk -> Disk Groups -> Pool -> Volumes

pool

when you create a disk group you must create a pool if the disk group is virtual there can only be two virtual pools A and B

A virtual pool can contain many virtual disk groups but they are all considered as one storage space.

A pool is an aggregation of one or more drives in the form of one or more disk groups that serves as a container for volumes.

Virtual and linear storage systems both use pools.

For virtual pools, which can have multiple disk groups

For linear pools, which can only have one disk group per pool

"Pool" Menu

 

 

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Multipaht I/O (MPIO)

 

Failover Cluster 's shared Storage

When I go to Disk Management of the servers, I see duplicate drives listed because HBA's connect to both MSA controllers.

Second set of drives is offline and the status message says because they are redundant. This shows on both servers.

MPIO(Multipath I/O) feature

=> more than one physical path between server and storage

=> Multipath software layers 提供

      (fault-tolerance and performance-enhancement technique)

Windows Server Setting

1. Add the MPIO(Multipath I/O) feature in server manager for each node

    so windows knows about and can proper manage redundant routes.

2. To add the SAN, go to the "Discover Multi-path" tab

• tick Add support for iSCSI devices
• tick Add support for SAS devices

    You will be prompted to reboot. 

    Upon boot up the SAN will be added to MPIO Devices as shown (HP MSA 2040 SAN)

    安裝完成 reboot 後:

Add an iSCSI Target to Your Windows Server

1. Launch Microsoft iSCSI Initiator and proceed to the Discovery tab.

Add all of the IP addresses of your Synology NAS in the Target portal list by clicking "Discover Portal" button.

2. Switch to the Targets tab, select a target to enable MPIO and click Connect.

3. Tick

"Add this connection to the list of Favorite Targets"
"Enable multi-path and click Advanced"

4. Add the Second iSCSI Connection Path

Switch to "Target tab" and click "Devices"

Choose one of the "Load-balance Policy"
Round Robin with Subset / Failover ONLY

Verify

You may confirm the multi path connection is working within iSCSI Manager in DSM
(you will see two IP addresses shown as connected. )

Linux - Device mapper

 

 

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