1.aix下rhdisk和hdisk的区别是什么？

rhdisk为字符设备，hdisk为块设备。块设备可以随机存取，而字符设备不能随机存取。

2.如何查看磁盘的属性？（查看磁盘的属性信息，其中reserve_policy对于集群来说比较重要。）

root@itgs1:/dev$ lsattr -El hdisk4PCM             PCM/friend/NetAppDefaultPCM Path Control Module              FalsePR_key_value    none                        Persistant Reserve Key Value     Truealgorithm       round_robin                 Algorithm                        Trueclr_q           no                          Device CLEARS its Queue on error Truedist_err_pcnt   0                           Distributed Error Sample Time    Truedist_tw_width   50                          Distributed Error Sample Time    Truehcheck_cmd      inquiry                     Health Check Command             Truehcheck_interval 30                          Health Check Interval            Truehcheck_mode     nonactive                   Health Check Mode                Truelocation                                    Location Label                   Truelun_id          0x1000000000000             Logical Unit Number ID           Falselun_reset_spt   yes                         LUN Level Reset                  Truemax_transfer    0x40000                     Maximum TRANSFER Size            Truenode_name       0x500a09808f40d1d2          FC Node Name                     Falsepvid            none                        Physical volume identifier       Falseq_err           yes                         Use QERR bit                     Trueq_type          simple                      Queuing TYPE                     Truequeue_depth     8                           Queue DEPTH                      Truereassign_to     120                         REASSIGN time out value          Truereserve_policy  no_reserve                  Reserve Policy                   Truerw_timeout      30                          READ/WRITE time out value        Truescsi_id         0x92e00                     SCSI ID                          Falsestart_timeout   60                          START unit time out value        Trueww_name         0x500a09859f40d1d2          FC World Wide Name               Falseroot@itgs1:/dev$

3.如何查看磁盘头信息

root@itgs1:/$ lquerypv -h  hdisk7============= B: HEADER /dev/rhdisk7 ============= 00000000   00820101 00000000 80000003 AB36078C  |.............6..|00000010   00000000 00000000 00000000 00000000  |................|00000020   4F52434C 4449534B 00000000 00000000  |ORCLDISK........|00000030   00000000 00000000 00000000 00000000  |................|00000040   0B200000 00030103 44415441 5F303030  |. ......DATA_000|00000050   33000000 00000000 00000000 00000000  |3...............|00000060   00000000 00000000 44415441 00000000  |........DATA....|00000070   00000000 00000000 00000000 00000000  |................|00000080   00000000 00000000 44415441 5F303030  |........DATA_000|00000090   33000000 00000000 00000000 00000000  |3...............|000000A0   00000000 00000000 00000000 00000000  |................|000000B0   00000000 00000000 00000000 00000000  |................|000000C0   00000000 00000000 01F720EF 36E71C00  |.......... .6...|000000D0   01F82F4A 66327000 02001000 00100000  |../Jf2p.........|000000E0   0001BC80 00019000 00000002 00000001  |................|000000F0   00000002 00000000 00000000 00000000  |................|============= E: HEADER =============

 

4.如何在两个节点确认两块盘为同一块磁盘？

可通过对比 dfY3KZlXzMTL来比较两个节点的磁盘是否为同一块磁盘

oracle@itgs1:/dev$ lscfg -vpl hdisk4  hdisk4           U9179.MHC.1010B0T-V7-C11-T1-W500A09859F40D1D2-L1000000000000  MPIO NetApp FCP Default PCM Disk        Manufacturer................NETAPP          Machine Type and Model......LUN                     ROS Level and ID............811a        Serial Number...............dfY3KZlXzMTL        Device Specific.(Z0)........FAS6240           PLATFORM SPECIFIC  Name:  disk    Node:  disk    Device Type:  block