Whether or not to install Oracle 10g RAC installation required HACMP

Mar 1 posted in Oracle (RSS), 346 views.

In fact, no matter at which the operating system (AIX, HP-UX, Solaris, Linux) on Oracle10g RAC installation are no longer required Vendor Clusterware (IBM's HACMP, HP's Service Guard, Veritas the VCS, etc.), regardless of selection are at storage ASM bare or device or operating system vendor to provide a shared file system, such as AIX on the GPFS.

Standards of the last speakers in the east when the Oracle database, once said:

If we choose to do with pure bare equipment Oracle 10g RAC data files, then the AIX platform on the need to install HACMP, in HP-UX platform on the need to install Service Guard.

This is not entirely correct about this correction.

In fact, no matter at which the operating system (AIX, HP-UX, Solaris, Linux) on Oracle10g RAC installation are no longer required Vendor Clusterware (IBM's HACMP, HP's Service Guard, Veritas the VCS, etc.), regardless of selection are at storage ASM bare or device or operating system vendor to provide a shared file system, such as AIX on the GPFS.

So why mention AIX, if the selection must want bare equipment (referred to here refers to pure bare naked equipment equipment, because ASM is in fact naked in the management of equipment) as the Oracle data file storage, we recommend that you install HACMP? Is Since the specificity of AIX operating system, on the AIX operating system, each character device (corresponding to a rhdisk) can only correspond to the division on a storage LUN, and other operating systems can be broken down at LUN characters continue on equipment, such as LUN are 128G, then on each AIX are rhdisk only 128G, each of which is a bare rhdisk equipment, and other operating systems were allowed to continue on in this LUN carved out more than the bare equipment, the size can be customized.

We know that for Oracle RAC for each control file, each online redo log file, or even have to correspond to a bare spfile equipment, if stored at a time when planning 128G we have created the LUN, then on our AIX 128G will only lead to the control of a document, a 128G-line redo log files, a 128G of the spfile, because alone we can not rely on the operating system has been subdivided.

In the AIX operating system must use LVM (Logical Volume Manager) divided by LV (Logical Volume), each the size of LV can be controlled, in a LUN can be divided into a number of us on LV, so the operating system level reached at Planning, the purpose of storage. At this time reflected the role of HACMP, to mount Concurrent Volume Group (Do not need in fact HACMP can also create LV and VG, but can not be set to Concurrent mode VG, instead of Concurrent mode VG are more than machines can not be At the same time to read and write), it is necessary to install HACMP, therefore, strictly speaking, this type of storage should be called Raw Logical Volumes, and not Raw Disks, these two are the Raw Devices.

In fact, if we are level at the storage LUN on the size of the detailed planning, such as the creation of four 128M of LUN, 1 A spfile give, and give control of three documents, and then to create eight 256M of LUN, to re-line eight log used to do (4 groups, each group 2 member), then to continue planning for the SYSTEM table space for the SYSAUX tablespace for UNDO table space, table space for user data are separately much of the LUN , then they can still HACMP on AIX Do not need to build up a pure bare equipment storage medium for the Oracle10g RAC database.

Concluded that the existence of the Oracle Clusterware because, in essence, no matter what selection is stored in any operating systems are no longer required on third-party cluster software.

Finally mention about ASM, the ASM, the bottom can be raw disks can also be raw LVs, but are recommend raw disks, because the exercise itself, ASM has the function similar to LVM, so no longer need to create redundant LV, and If you do not choose ASM, then recommend the use of raw LVs.