What is Block Pool

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A Block Pool is a set of blocks that belong to a single Namespace. DataNodes store blocks for all the block pools in the cluster. Each Block Pool is managed independently. This allows a Namespace to generate Block IDs for new blocks without the need for coordination with the other Namespaces. A NameNode failure does not prevent the DataNode from serving other NameNodes in the cluster.

Other related questions:
How do I block a Designated Port. on an S series switch?
You can perform the following operations to block a Designated Port on an S (except the S1700) series switch: 1. Run the stp priority command to set the priority of a switch. 2. Run the stp cost command to set the path cost of a port. 3. Run the stp port priority command to set the priority of the port.

What should I do if the account is locked
By default, a locked account is automatically unlocked after 5 minutes. You can wait until the account is automatically unlocked, and enter the correct user name and password to log in to the device again. You can also log in to the device using the CLI mode when the account is locked, and run the local-user user-name state active command in the AAA view to unlock the account.

What is the resource pool used for?
The resource pool provides common resources for the following value-added services: Virtual snapshot During the virtual snapshot creation, the resource pool on the owning controller of the source LUN is employed. Incremental LUN copy During the incremental LUN copy, the resource pool on the owning controller of the source LUN is employed. Asynchronous remote replication During synchronization of the asynchronous mirrored pair, the resource pools on both the owning controller of the primary LUN and the working controller of the slave LUN are employed. You must ensure that common resources are available before running the services above. Otherwise, add LUNs to relevant resource pools for compensation.

Configure a CE series switch to filter packets using a traffic policy
- Prevent a specified host from accessing a network. In the following example, the switch is configured to prevent the PC with IP address 192.168.1.10 from accessing the network. <HUAWEI> system-view [~HUAWEI] acl 2000 [*HUAWEI-acl4-basic-2000] rule deny source 192.168.1.10 0.0.0.0 [*HUAWEI-acl4-basic-2000] quit [*HUAWEI] traffic classifier c1 [*HUAWEI-classifier-c1] if-match acl 2000 [*HUAWEI-classifier-c1] quit [*HUAWEI] traffic behavior b1 [*HUAWEI-behavior-b1] deny [*HUAWEI-behavior-b1] quit [*HUAWEI] traffic policy p1 [*HUAWEI-trafficpolicy-p1] classifier c1 behavior b1 [*HUAWEI-trafficpolicy-p1] quit [*HUAWEI] interface 10ge 1/0/1 [*HUAWEI-10GE1/0/1] traffic-policy p1 inbound [*HUAWEI-10GE1/0/1] quit [*HUAWEI] commit - Prevent all devices on a specified network segment from accessing a network. In the following example, the switch is configured to prevent all devices on the network segment 192.168.1.0 from accessing the network. <HUAWEI> system-view [~HUAWEI] acl 2000 [*HUAWEI-acl4-basic-2000] rule deny source 192.168.1.0 0.0.0.255 [*HUAWEI-acl4-basic-2000] quit [*HUAWEI] traffic classifier c1 [*HUAWEI-classifier-c1] if-match acl 2000 [*HUAWEI-classifier-c1] quit [*HUAWEI] traffic behavior b1 [*HUAWEI-behavior-b1] deny [*HUAWEI-behavior-b1] quit [*HUAWEI] traffic policy p1 [*HUAWEI-trafficpolicy-p1] classifier c1 behavior b1 [*HUAWEI-trafficpolicy-p1] quit [*HUAWEI] interface 10ge 1/0/1 [*HUAWEI-10GE1/0/1] traffic-policy p1 inbound [*HUAWEI-10GE1/0/1] quit [*HUAWEI] commit - Filter specified protocol packets. - Prevent SMTP packets with TCP destination port 25 from passing through a switch. - Prevent POP3 packets with TCP destination port 110 from passing through a switch. - Prevent HTTP packets with TCP destination port 80 from passing through a switch. <HUAWEI> system-view [~HUAWEI] acl 3000 [*HUAWEI-acl4-advance-3000] rule deny tcp destination-port eq 25 [*HUAWEI-acl4-advance-3000] rule deny tcp destination-port eq 110 [*HUAWEI-acl4-advance-3000] rule deny tcp destination-port eq 80 [*HUAWEI-acl4-advance-3000] quit [*HUAWEI] traffic classifier c1 [*HUAWEI-classifier-c1] if-match acl 3000 [*HUAWEI-classifier-c1] quit [*HUAWEI] traffic behavior b1 [*HUAWEI-behavior-b1] deny [*HUAWEI-behavior-b1] quit [*HUAWEI] traffic policy p1 [*HUAWEI-trafficpolicy-p1] classifier c1 behavior b1 [*HUAWEI-trafficpolicy-p1] quit [*HUAWEI] interface 10ge 1/0/1 [*HUAWEI-10GE1/0/1] traffic-policy p1 inbound [*HUAWEI-10GE1/0/1] quit [*HUAWEI] commit

Blocking a specified domain name on the firewall
For V100R001 and V5, you can configure a security policy, set the destination address to a domain name group that contains the list of domain names to be blocked, and set the action to block to block these domain names. You can also configure URL filtering to blacklist the domain names to be blocked so as to block them. For V300R001, you can only configure URL filtering to blacklist the domain names to be blocked so as to block them.

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