VMware 虚拟化平台规划设计方案

•RDM: Configurations using shared storage for Quorum and/or Data must be on Fibre Channel (FC) based RDMs (physical mode for cluster across boxes "CAB", virtual mode for cluster in a box "CIB") in vSphere 5.1 and earlier. RDMs on storage other than FC (iSCSI and FCoE) are only supported in vSphere 5.5..

•VMFS: Virtual disks used as shared storage for clustered virtual machines must reside on VMFS datastores and must be created using the EagerZeroedThick option. This can be done using the vmkfstools command from the console, the vSphere CLI, or from the user interface. To create EagerZeroedThick storage with the vmkfstools command:

1.Log into the console of the host or launch the VMware vSphere CLI.

2.For example, to create a 10 GB file in datastore1 named myVMData.vmdk, run the command:

▪Using the console:vmkfstools –d eagerzeroedthick –c 10g /vmfs/volumes/datastore1/myVM/myVMData.vmdkNote: Replace 10g with the desired size.

▪Using the vSphere CLI:vmkfstools.pl –-server ESXHost –-username username --password passwd –d eagerzeroedthick –c 10g /vmfs/volumes/datastore1/myVM/myVMData.vmdk

•To create EagerZeroedThick storage with the user interface:

1.Using the vSphere Client, select the virtual machine for which you want to create the new virtual disk.

2.Right-click the virtual machine and click Edit Settings.

3.From the virtual machine properties dialog box, click Add to add new hardware.

4.In the Add Hardware dialog box, select Hard Disk from the device list.

5.Select Create a new virtual disk and click Next.

6.Select the disk size you want to create.

7.Select the datastore with the virtual machine or select a different datastore by clicking Specify a datastore and browsing to find the desired datastore.

8.To create an EagerZeroedThick disk, select Support clustering features such as Fault Tolerance.Note: Step 8 must be the last configuration step. Changes to datastores after selecting Support clustering features such as Fault Tolerance cause it to become deselected.

Complete the wizard to create the virtual disk.

根据以往经验，如果数据库的大小<800G，建议使用VMFS格式，如果数据库大小>800G，可以考虑使用RDM方式。

需要设置的共享盘：心跳盘，数据库用到的磁盘(NEC Cluster设置需要磁盘多宿主)。

在使用NEC Cluster时候，主应用虚拟机允许迁移，但不设置回切。在主备虚拟机之间设置关联规则：互斥，避免应用双机同时迁移到同一台ESXi主机上。

设置NEC Cluster共享盘时， 心跳磁盘大小大于200M以上即可，使用VMFS方式。

设置集群IP时：分为Service IP(对外)，public IP(管理)，private IP(心跳)。Service IP与public IP在同一网段内，private IP单独规划出一个网段，做到网络隔离。

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