What is Oracle ACFS and ADVM

Hi, I am trying to get my head around what Oracle ACFS and ADVM are exactly regarding the ASM (Oracle manuals are far from clear!)

Q1. In my opinion, ACFS extends the ability of ASM to manage and present file systems that are not just a single server, but where a file system itself could be distributed on a cluster of servers - is that correct?

Q2. ADVM on the otherhand is fading me a bit. I know ACFS sits at the top of the ADVM but I try workout what ADVM offers above the capacity of management of usual volume of the DSO in the first place?

Q3. What is ASMLib for?

Q4. I think oracleasm's ASMLib command line interface - is that correct?

any help would be appreciated,

Jim

The last time I created an extended partition has been in days BACK/WFW.

For single servers me given configuration and administration as servers Oracle dn, have generally 3 disks. 1 x 500 GB for 3 partitions: boot, swap and root.

2 x 1 TB drives for the DSO. On that I create a single partition, partition of 4, which allows custom udev rules that make a device for the DSO to use. In ASM, I will then create a diskgroup normal redundancy (2 way mirror) on these.

If a new record is added - any server owner has to do is run as root and do fdisk partition 4 on this disc. Once this is done, the disk will appear as a new candidate in ASM disk.

Basic example of the udev rule custom and the alphabet used to generate the name of the device is in Re: Configure ASM disks without ORACLEASM.

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    Is this the case?  If yes why never bore you with 3rd party clusters? -Since you will have to install Oracle Clustering anyway - and I probably have to license (all I can think about is the scenario that you already have a cluster of 3rd party in place and you decide that you need to use the same material for a database cluster)?

    All wisdom greatly appreciated,

    Jim

    Yes, with 10g, you had to use the CRS, and with 11g, to use the GI.  For 9i RAC, you would use Verits Cluster and Sun Cluster or anything else.

    11g RAC to GI.  As above, you can use clusterware extra if needed.  I gave the example above where to a 10g RAC we used the CRS to the cluster database/listener/vip and allowing groups of volume and filesystem in HACMP cluster.  File systems were not shared, but could switch to another node failure node, who has been treated by HACMP.  The volume of the groups containing the raw devices were shared volume groups.  For 11g, I never used extra clusterware on top of CRS and have always used ASM which is part of the GI.

    The application provider only certified database to run on 10g on AIX with raw devices.  What is strange about that?  It would be unusual that you probably expect to use ASM instead of raw devices, but it is what it is.

    See the following Note of Oracle for more information: using Oracle Clusterware with vendor Clusterware FAQ (Doc ID 332257.1)

    It is perhaps easier to explain if you can explain what problem you are trying to solve?

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