What exactly is a failure group?

Oracle Version : 10GR2
2 node RAC running on Solaris
I am trying to understand what a failure group is. Googling didn't help much .
If i want to store 1 TB of data and needs it be to proteced either by NORMAL or HIGH redundancy and i have 3 slices of 1TB each available like
/dev/rdsk/c4ikdzs1
/dev/rdsk/c4ikdzs2
/dev/rdsk/c4ikdzs3How does a failure group come into picture?

In your example, you would not need the concept of failure groups. But let's assume you had 4 disks on two different controllers like:
c0t0d0
c0t0d1
c1t0d0
c1t0d1
And you want to set up a diskgroup with normal redundancy on these 4 disks. In that case, wouldn't it be useful to let ASM know that two disks share the same controller and wouldn't it be nice if ASM was able to mirror data on disks across both controllers (like mirroring between c0t0d0 and c1t0d0 instead of c0t0d0 and c0t0d1) so that you still have an available pair of disks even if one controller fails.
And that is what failure groups are for.

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What is the failure group in ASM and the meaning of ASM assigns each disk

Hi
Please help me in understanding
what is the failure group in ASM and the meaning of "ASM assigns each disk to it's own failure group, by default"

As you may have known ASM uses mirroring and striping of files. Mirroring is storing same compies/parts of files in different disks/controllers. When creating disk group which could consist of several disks, you have to assign disks at least to separate failure groups for normal redundancy , or three failure groups for High redundancy. This means that ASM will never assign mirrode copies/pieces of files to the same failure group. So, assigning disks to different failure groups you make sure mirrored copies are not on the same physical storage. Saying with other words, failure group gives your more abstract meaning based on which you can organize your physical disks contained in disk group.
That is why for normal redundancy at least two failure groups are needed, because there are one mirrored copy of each extent(allocation unit, to be exact) and for high redundancy the requirement is at least 3 failure groups, because each allocation unit has 2 mirrored copies, which should be on different failure group, consequently.
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Hi,
So i'll post my answer for your 2 questions.
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A2. A Synchronization doesn't create a RP but just in case you can create one if needed.
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Hi,
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Belinda Ma
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I am not sure how to configure a Failure Group in ASM.
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So I start dbca - choose configure ASM
Create Diskgroup --> Data
select my 2 raw devices ( which are on 2 storages)
I select normal redundancy;
Disk Path ASM Name Failure Group
/dev/raw/raw4 Data1 FG1_Data
/dev/raw/raw5 Data2 FG2_Data
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Hi,
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See here:
http://help.sap.com/saphelp_nw04/helpdata/en/8a/3045381d10f327e10000009b38f8cf/content.htm
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What exactly the VL10A T,Code do

Hi,
Could any body tell me what exactly VL10A do.
Thanks,
BSV

Hi,
Deliver Documents due for Delivery and Display Deliveries
Title
Documents due for delivery.
User-specific settings
New functions in Release 4.6C
New functions in Release 4.6A.
Purpose
Documents are selected according to specific criteria.
They are used for processing orders that are due for delivery.
Deliveries can also be selected.
These can be deliveries that already exist for the sales orders
and/or deliveries that were selected using other criteria. This is an independent transaction and can be executed without the sales order or purchase orders.
Documents (such as sales orders or purchase orders) are analyzed or delivered after their planned delivery creation time.
The analysis creates an overview of the upcoming shipping workload and allows you to change the planned outbound delivery situation manually in the selected delivery list. You can use this function for the following procedures, for example:
Manual selection of documents due for delivery from a larger delivery list
Manual specification of the actual quantities to be delivered (scheduling agreement item, for instance)
Introductory phase for setting automated creation of outbound deliveries
Collective delivery of multiple documents in one processing step is especially useful if:
Delivery occurs regularly in the background. You can define rules for this delivery in a list profile. The system then works through these rules at regular intervals.
If more time passes between the initial transaction (sales order, purchase order) and the actual outbound delivery (picking, shipment completion) than is necessary for picking and transportation planning
if several orders for one ship-to party should be put together in one delivery.
Integration
Delivery of documents (orders) via the delivery list is integrated in the following Logistics supply chains:
Sales order - Delivery - Picking - Shipment - Billing document
Purchase order - Delivery - Picking - Shipment - Billing document/ Self-billing
Creation of the outbound delivery is the central element for outbound shipment of goods and services.
Prerequisites
All documents that are planned for delivery are taken into account. In other words, a delivery list is created. In Release 4.6A, these documents are either sales orders or purchase orders.
For sales orders, for example, the availability check must have confirmed a quantity and the conditions for creation of the delivery list must also be met.
Selection
Select the delivery list according to the criteria of your choice.
The user role (list profile) dictates which of the selection criteria is active. As an example, selection criteria that is only relevant for purchase orders is only available for entry when purchase orders are to be selected.
Validity of selection criteria
The general selection criteria (tab page General data) restricts the number of sales orders and purchase orders found.
The selection criteria for sales orders (tab page sales orders) restricts the number of sales orders found.
The selection criteria for purchase orders (tab page purchase orders) restricts the number of purchase orders found.
The selection criteria for deliveries (1 or 3 tab pages deliveries) restricts the number of deliveries used. Note that selecting deliveries for the sales orders is automatically activated via the switch Selection in the user role (list profile) tab page. This procedure is maintained for reasons of upward compatibility. You therefore, have the option of making entries in the deliveries tab page. You can deactivate automatic selection of deliveries to the sales orders (No Deliveries to Predecessor) and include additional deliveries in the list (CompleteDeliveries). You can add a maximum of 3 further selection criteria to the deliveries, for example: delivery header, delivery status, delivery item, group of deliveries or a shipment.
Selecting by material (tab page Material) restricts the sales orders and purchase orders.
Selecting by partner (tab page Partner) restricts the sales orders and deliveries.
The user role details apply for the whole transaction and are used as control parameters in the process context.
The delivery creation date selection criterion limits the documents due for delivery according to the date on which they are planned for delivery.
This planning is a result of delivery scheduling when the sales order or purchase order was processed.
When this transaction is called up, the selection date is a default value calculated according to a rule that was specified</ in Customizing in a user role list profile.
Use the smallest possible interval in performance-critical systems.
In performance-critical systems, make sure that the fewest possible documents overdue for delivery exist in the system. For sales orders, you can process overdue documents in the sales menu environment.
You can use selection criteria on the schedule line level (goods issue time, route schedule, planned delivery creation time) to:
Find documents that contain items with schedule lines to which the criteria apply
Calculate the quantity default for the delivery quantity by using only the schedule lines that match the selection criteria. Completion of the order item always occurs for the oldest open schedule line.
Standard Variants
Standard variants for selection are implemented using delivery scenarios (different call-up methods for selection screen) and list profiles (entry in sub-screen of list profile selection screen).
Output
Depending on the F code profile specification one of the following occurs in the list profile:
A list of all documents due for delivery appears or is printed
Documents due for delivery are delivered immediately. In other words, the delivery is created and the subseuqent activities (output, picking, statistics, batch determination,...) are triggered in the system.
Activities
For daily use, choose the desired selection criteria for your delivery scenario.
For specific list output requirements, change the list profile entries as necessary. You are advised to do this in the test system. You should only use tested user roles in the productive system, that no longer allow you to override the user role entries in the selection screen. In Customizing for the scenario (transaction VL10CUV) you can set whether the default user role for the scenario my be replaced in the selection screen. If you carrry out this task as a system adminstrator with Customizing authorization, you can enter in the user role (transaction VL10CUA) whether the user role entries may be overwritten in the selection screen. Use these options in the test system and set up roles and report variants for each user that requires these for his daily work. However, do not allow the user role attributes to be overwritten in the selection screen during day-to-day operations.
You can predefine specific values and selection criteria in the user role attributes for each user in every scenario.
For more information see: user-specific settings.
Automatic processing of the delivery list
In the implementation phase of automatic processing of the delivery list (automatic creation of deliveries via scheduling in a background program: batch job), it is advisable to override the list profile settings in the selection screen. Vary the entries until the list display (with subsequent delivery in the background and no other list modifications) results on delivery of the desired part of the delivery list.
Choose an F code profile for displaying the delivery list in the list profile.
Once you know all the required list profile parameters from the entries, define a corresponding list profile in Customizing. After testing the list output, if you are sure that the correct part of the list is delivered, assign an F code profile for background processing to the list profile.
Create a selection varaint for this selection report with the corresponding list profile (on the selection screen, choose Goto -> Variants -> Save as a variant).
Schedule this selection report using the menu for background processing.
Customizing
Delivery scenario
The delivery scenarios predefined in the system can be found under Logistics Execution -> Goods issue process -> Outbound deliveries -> Create -> Collective processing of documents due for delivery. A list profile can be assigned for each delivery scenario in Customizing. This determines processing of the delivery due list in detail. It also specifies the selection screen display, in particular whenther tab strips are used and if so, how many.
List profile
The list profile is found using the delivery scenario and can be changed manually in the selection screen for documents due for shipping or individual attributes can be overwritten.
User-specific default scenario
You can enter a default delivery scenario and a default list profile for each user, that is called up from the menu or via transaction VL10. Set the user parameters LE_VL10_SZENARIO and LE_VL10_PROFIL.
<b>Reward points</b>
Regards

What is difference between user group and reference user group?

hi
guys,
what is difference between user group and reference user group?
your regards
p.suresh

Hi ,
Chk the link below for your clarifiacation.
http://help.sap.com/erp2005_ehp_03/helpdata/EN/5c/c1c81c445f11d189f00000e81ddfac/frameset.htm
Hope it helps.
Regards,
Amit
Edited by: Amit Kotwani on Sep 2, 2008 2:15 PM

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Hi all,
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IT_ID3 ITEM;
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Can You please tell me what exactly is happening in the above code?
I want to know the working of it. Help me plz.
Thank You.
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
Oracle Forms 6i.

what does if :system.mode<>'ENTER-QUERY' THEN mean??
SYSTEM.MODE indicates whether the form is in Normal, Enter Query, or Fetch Processing mode. The value is always a character string.
and what does GO_BLOCK(GET_APPLICATION_PROPERTY(CURRENT_FORM_NAME)); do?
GET_APPLICATION_PROPERTY Returns information about the current Oracle Forms application. CURRENT_FORM_NAME Returns the name of the current form as indicated by the form module Name property.
GO_BLOCK navigates to an indicated block. If the target block is non-enterable, an error occurs.
As per the code, After i press the button, the label ENTER QUERY should become CANCEL QUERY, (that is when system is in ENTER_QUERY mode) .
So when in the system is in ENTER_QUERY mode, it must display CANCEL QUERY, Right??
in your post, you also said..
The below code is the WHEN_BUTTON_PRESSED Trigger for the ENTER_QUERY (Push Button):
We see 3 button in your code. How can we know which one is ENTER_QUERY button. Your code says...
ENTER_QUERY;
set_item_property (it_id1,label,'ENTER QUERY');
So, it says.. BUTTON.EN_QUERY label will be ENTER QUERY
Then why the code, (if :system.mode<>'ENTER-QUERY' THEN set_item_property (it_id1,label,'CANCEL QUERY');) ?? which says if system mode is not equal to ENTER_QUERY,
then it tells to display CANCEL QUERY.
it says.. BUTTON.EN_QUERY label will be CANCEL QUERY

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What exactly is a failure group?

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