How important are the Cache Backup Battery Modules

I have finally gotten my raid in full speed by selecting write cache and drive cache options in the raid admin. It looks like cache backup batteries are recommended for those options, but I don't have any. How critical is it to have those batteries ? I work with broadcast video and 12 client setup.

If you aren't using a UPS, they are very important. If you suddenly lose power with the cache enabled, there will be data that was written to cache but not to disk. That data will be lost -- this could cause data loss and/or corruption of the volume.
If you have a UPS (actually, two separate UPSes with one side of the RAID connected to each), then the battery back-up modules are less important. What they do is maintain power to the cache for at least 72 hours in the event of a power failure. So long as you get power back to the RAID within this window, data will be safely pushed from the cache down to the disks on the RAID.
For $300, I think it's an easy choice, personally.

Similar Messages

What size Time Capsule - i.e. how big are Time Machine Backups

Hi all,
Just trying to decide which Time Capsule to get...my question is basically how big are Time Machine backups.
For example I have a MacBook with 100gb harddrive. At the moment about 80gb in use.
I assume the Time Capsule will immediately backup that 80gb but how big are the incremental backups. If I modify about a GB's worth of data each day, does this GB get moved to the capsule or is Time Machine cleverer than this and only backups the changes at byte level for example.
Any pointers, thoughts, etc. much appreciated.
Michael.

I have an iMac with a 500GB hard drive and a MacBook with an 80GB hard drive. The MacBook is nearing capacity but the iMac has around 90GB of data (the Time Machine backup is around 93GB). I will likely opt for the 1TB version as I am eligable for a Government discount bringing the cost down to £303 (£183 for the 500GB version). As it's unlikely that it will be easy to upgrade the Time Capsule HDD then I'm looking at future proofing as I do not want to have to repurchase in a few years. I'm also likely to buying a second MacBook or MacBook Pro in the coming months so it does make sense.
Secondly, you can use the Time Capsule as a shared storage area as well as for the Time Machine function.

How to write the exceptions in function module

dear all,
how to write the exceptions in function modules with example.
thanq
jyothi

Hi,
Raising Exceptions
There are two ABAP statements for raising exceptions. They can only be used in function modules:
RAISE except.
und
MESSAGE.....RAISING except.
The effect of these statements depends on whether the calling program handles the exception or not. The calling program handles an exception If the name of the except exception or OTHERS is specified after the EXCEPTION option of the CALL FUNCTION statement.
If the calling program does not handle the exception
· The RAISEstatement terminates the program and switches to debugging mode.
· The MESSAGE..... RAISING statement displays the specified message. Processing is continued in relation to the message type.
If the calling program handles the exception, both statements return control to the program. No values are transferred. The MESSAGE..... RAISING statement does not display a message. Instead, it fills the system fields sy-msgid, sy-msgty, sy-msgno , and SY-MSGV1 to SY-MSGV4.
Source Code of READ_SPFLI_INTO_TABLE
The entire source code of READ_SPFLI_INTO_TABLE looks like this:
FUNCTION read_spfli_into_table.
""Local Interface:
*" IMPORTING
*" VALUE(ID) LIKE SPFLI-CARRID DEFAULT 'LH '
*" EXPORTING
*" VALUE(ITAB) TYPE SPFLI_TAB
*" EXCEPTIONS
*" NOT_FOUND
SELECT * FROM spfli INTO TABLE itab WHERE carrid = id.
IF sy-subrc NE 0.
MESSAGE e007(at) RAISING not_found.
ENDIF.
ENDFUNCTION.
The function module reads all of the data from the database table SPFLI where the key field CARRID is equal to the import parameter ID and places the entries that it finds into the internal table spfli_tab. If it cannot find any entries, the exception NOT_FOUND is triggered with MESSAGE ... RAISING. Otherwise, the table is passed to the caller as an exporting parameter.
Calling READ_SPFLI_INTO_TABLE
The following program calls the function module READ_SPFLI_INTO_TABLE:
REPORT demo_mod_tech_fb_read_spfli.
PARAMETERS carrier TYPE s_carr_id.
DATA: jtab TYPE spfli_tab,
wa LIKE LINE OF jtab.
CALL FUNCTION 'READ_SPFLI_INTO_TABLE'
EXPORTING
id = carrier
IMPORTING
itab = jtab
EXCEPTIONS
not_found = 1
OTHERS = 2.
CASE sy-subrc.
WHEN 1.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno.
WHEN 2.
MESSAGE e702(at).
ENDCASE.
LOOP AT jtab INTO wa.
WRITE: / wa-carrid, wa-connid, wa-cityfrom, wa-cityto.
ENDLOOP.
The actual parameters carrier and jtab have the same data types as their corresponding interface parameters in the function module. The exception NOT_FOUND is handled in the program. It displays the same message that the function module would have displayed had it handled the error.
Or
just have to decide what exceptions u want and under what conditions.
then declarethese exeptions under the exceptions tab.
in the source code of ur function module.
if
like this u can code .
now when u call the function module in tme mainprogram.
if some error occurs and u have declared a exception for this then it will set sy-subrc = value u give inthe call of this fm.
in the fm u can program these sy-subrc values and trigger the code for ur exception.
Please reward if useful
Regards,
Ravi
Edited by: Ravikanth Alapati on Mar 27, 2008 9:36 AM

Can't back up my Iphone5 to my macbook pro, it tells me it may be corrupted, also I don't know how to delete the old backup to redo it

Can't back up my Iphone5 to my macbook pro, it tells me it may be corrupted, also I don't know how to delete the old backup to redo it

Hi Caveman337,
Welcome to the Support Communities! The resource below will explain how to delete an old iTunes backup. Before you do this, I would suggest creating an iCloud backup of your iPhone.
Back up and restore your iPhone, iPad, or iPod touch using iCloud or iTunes - Apple Support
http://support.apple.com/en-us/HT203977
Back up using iCloud
If you're using iCloud, it can automatically back up your content. Use these steps to turn on iCloud Backup:
Tap Settings > iCloud > Backup. If you're using iOS 7 or earlier, tap Settings > iCloud > Storage & Backup.
Tap iCloud Backup to turn it on.
Tap Back Up Now.
After you turn on iCloud Backup, iCloud will back up your content automatically. You can return to this screen to see when the last back up happened.
Create and delete iPhone, iPad, and iPod touch backups in iTunes - Apple Support
http://support.apple.com/en-us/ht4946
Where your backups are stored
The folder where your backup data is stored depends on your computer's operating system. Make sure the backup folder is included in your data-backup routine. iTunes places the backup files in these places:
Mac: ~/Library/Application Support/MobileSync/Backup/
The "~" represents your Home folder. If you don't see Library in your Home folder, hold Option and click the Go menu.
Delete a backup
If you want to delete a backup created by iTunes:
Open iTunes Preferences:
Mac: Choose iTunes > Preferences.
Windows: Choose Edit > Preferences. Learn how to turn on menus in Windows 7 and 8.
Click Devices. (The iOS device doesn't need to be connected.)
iTunes will show the phone number, International Mobile Equipment Identity (IMEI) number, and serial number of the backed up iPhone when you position your mouse pointer over a backup. (Only the serial number will be shown for iPad and iPod touch). You can use this to find the backup you want to delete.
Select the backup you want to remove.
Click Delete Backup.
When prompted, confirm that you want to remove the selected backup by clicking Delete Backup.
Click OK to close the iTunes Preferences Window.
Backups that have a date and time stamp in the backup name are copies of backups created by restoring the iOS device. The date and time in the left column are when the restore-from-backup occurred. The date and time in the right column are the last synced date; this shows how current the data is.
I hope this information helps ....
- Judy

What are the Includes in Function Module...? if the fuction group IS ZSJ_FC

What are the Includes in Function Module...? if the fuction group IS ZSJ_FC..?
How can I access SAP through Internet....?
Moderator Message: Interview-like question(s). Thread locked.
Edited by: Suhas Saha on Sep 30, 2011 11:14 AM

Hi
No! U can insert an own you Z-INCLUDE or somethingelse, try to regenerate the index of the program.
Max

How to clear the cache files in folder Temporary Internet Files

When one user opens files such as pdf. or doc. from Portal, the same file will be downloaded into the Temporary Internet Files folder. if another user copied the files out of the Temporary Internet Files folder from this computer and save to someplace else, then we face one security problem.
So my question is: How to clear the cache files in folder Temporary Internet Files?? Can we delete the files automatically when close the files in Portal??
or is there some ways to make encrypty???
Thanks very much!

Hello,
this is a basical security problem which should be resolved by the OS standard security setup . No other user should have access to the temporary file folders in the personal directory. The user account must be secure. Normaly your security problem should not be a problem if basic security exists on the clients.
You can resolve this problem if every user has his own account on the client
The users having no administration permissions on the clients
The folder for the temporary internet files is placed in the personal profile folder of the user account.
On default no other user has access rights to you personal folder, this means the client OS is setup correctly.
You can setup the IE that no temporary files are saved (but it reduces performance)
You can enable IE to delete automaticly the temporary files if IE is closed.
Hope it helps.
Regards
Alex

What are the parameters of Function Module

Hi,
What are the parameters of Function Module?

Function Modules are special external subroutine stored in a central library. The R/3 system provides numerous predefined function modules that you can call from the ABAP/4 programs.
All the function Modules are created under the Function Groups. Function Groups are nothing but the related group of function modules.
The function modules can be maintained through T.CodeSE37 and T.Code SE80.
In general the function module has the following components.
Documentation:
This is the place where you can find the discription/purpose of the function module.
Import & Export Parameters.
Import parameters correspond to the formal input parameters of subroutines. They pass data from the calling program to the function module.
Export parameters correspond to the formal input parameters of subroutines. They pass data from the function module back to the calling program.
Table Parameters.
Table parameters are internal tables. Internal tables are treated like changing parameters and are always passed by reference.
Exceptions.
Exceptions are used to handle error scenarios which can occur in the function modules. The function modules checks for any type of error and raise exception and returns SY-SUBRC value to the calling program.
Source Code:
the programming logic of the function module is written in this source code.
Rewards if useful.

How to set the Rman backup parameter.

Hi,
Can U guide me how to set the Rman backup path,control file auto backup & others parameter.

Hi,
Go through this,
Show all configurable settings:
RMAN>SHOW ALL;
Write disk backups to the /rmanback directory: (%U will be replaced with unique filenames)
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT '/rmanback/%U';
Backup using a flash recovery area rather than disk
RMAN> CONFIGURE CHANNEL DEVICE TYPE DISK FORMAT CLEAR;
Configure RMAN to back up the control file after each backup
RMAN> CONFIGURE CONTROLFILE AUTOBACKUP ON;
By default, RMAN automatically names control file backups and stores them in the flashrecovery area.
To configure RMAN to write control file backups to the /backup directory:( %F will generate a unique filename)
RMAN> CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/controlfile%F';
Ensure that RMAN retains all backups needed to recover the database to any point in time in the last 7 days:
RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;
Retain three backups of each datafile:
RMAN> CONFIGURE RETENTION POLICY TO REDUNDANCY 3;
Delete backups no longer required by the retention policy:
RMAN> DELETE OBSOLETE;
To override the configured retention policy for individual backups - use BACKUP.. KEEP (or CHANGE.. KEEP)
Configure backups to run in parallel by assigning two sbt channels:
RMAN> CONFIGURE DEVICE TYPE sbt PARALLELISM 2;
Reset any CONFIGURE setting to its default by running the command with the CLEAR option
RMAN> CONFIGURE CHANNEL DEVICE TYPE sbt CLEAR;
RMAN> CONFIGURE RETENTION POLICY CLEAR;
Regards,
oraclekt
Edited by: oraclekt on Sep 1, 2010 9:58 PM

How important are Aggregation and Exceptional aggregation

Hai All,
When defining a key figure, we define the aggregations, Aggregation (Min, Max etc.)and Exceptional Aggreagtion (Min, Max etc.).
How important are these. For example,for delivery dates, I know that thats the way the result row is calculated, either to display the min or max value. But except this, is there any other effect such as if there are more than one delivery date then defining Min. would take the earliest delivery date???
Please correct me if I am wrong. But I am just trying to find out the complete use of that definition of aggregation when creating key figures.
Thanks.

there are diffferent settings for keyfigure aggreation and bex display settings
rsa1 > change kf > aggregation tab:
this is the one which determince if the kf is a cumulative or non-cumulative.
rsa1 > change kf > additional properties :
here are the bex display settings.
Regards,
BWer
Assign points if helpful.

How to get the Grand Total in Module pool Screen

Hi Frds.
     How to get the Grand Total in Module pool Screen
Example i have 10 different materials
for each matarial has different moving . But in my case matarials is doesnt matter here
10 material Moving Average price to do Frand total and display in one column...
Please Help me out Frds.
Regards,
Kabil

Hi
You need to calculate the total in a module of PAI (or PBO) event:
PROCESS PAI.
   LOOP.....
   ENDLOOP.
MODULE CALCULATE_TOTAL.
MODULE CALCULATE_TOTAL.
    GRAND_TOTAL = 0.
     LOOP AT ITAB,
        GRAND_TOTAL = GRAND_TOTAL + ITAB-PWB.
    ENDLOOP.
ENDMODULE.
In this way the grand total will be calculated as soon as the user presses enter or another command.
You can't insert the calculation in the loop of table control, because this loop runs the visible lines only, so it's better to calculate the total out of those loop,

What are the different 'Add-on modules' available with LabVIEW?

What are the different 'Add-on modules' available with LabVIEW?
What are the types of 'Add-on Cards'?
Cards and modules are different,thats true.Is it that modules means software and are they same as 'add-on toolsets'.Please give the details/URL which would give me various toolsets in detail and also the specifications of various add-on cards?
Kindly do the needful
I require these details immediately.I am an Engg student and learning LabVIEW

duplicate post

How to restore the Password backup in sql server 2005

How to restore the Password backup in sql server 2005

Hello,
THANKS............ BUT
I executed this query
RESTORE DATABASE new_data1
FROM DISK = 'd:\UK_DETAILS.bak'
with password ='selfinity123'
WITH MOVE 'UK_DETAILS.bak' TO 'D:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\new_data1.mdf',
MOVE 'UK_DETAILS.bak' TO 'D:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\new_data1.ldf'
I got the error
Msg 319, Level 15, State 1, Line 4
Incorrect syntax near the keyword 'with'. If this statement is a common table expression or an xmlnamespaces clause, the previous statement must be terminated with a semicolon.

My time capsule is full and when I attempt to back up, I only receive a preparing back up message and the earliest and most recent back up dates remain the same. Why are the oldest backups not being deleted to make room for the newest backups?

My time capsule is full and when I attempt to back up, I only receive a preparing back up message and the earliest and most recent back up dates remain the same. Why are the oldest backups not being deleted to make room for the newest backups?

linda mariefromharper woods wrote:
My time capsule is full and when I attempt to back up, I only receive a preparing back up message and the earliest and most recent back up dates remain the same. Why are the oldest backups not being deleted to make room for the newest backups?
It may be in the process of making room. What version of OSX are you on? (That process can be excruciatingly slow on Leopard or Snow Leopard backups over a network; Lion has improved it greatly.)
A clue may be lurking in your logs. Use the widget in #A1 of Time Machine - Troubleshooting to display the backup messages from your logs. That should help you figure out what's going on. If in doubt, copy and post them here (but if the same ones repeat over and over, drop most of the duplicates).
If you can, connect via Ethernet; it will be 2-3 times faster.

How to make the phone's battery last longer ?

Hi everyone,
i am wondering if there is any difference when the battery is fully desharged thus the phone swithes off , and then you plug it into the power outlet to be charged.
or if it is not fully decharged, and it has some one or two battery bars on the upper right corner of the display, and you set it to be charged, is there any signifficant difference between these two states ?
is there any official or technical advice on "How to make the phone's battery last longer " ??
thanks in advance.

It depends on the battery.
Charging the battery when there is some power in it is especially bad for NiMH batteries. The loss of power is called "memory effect" - battery "remembers" that it does not get fully utilized and over time starts supplying less power.
But new Nokias come with Li-Ion or Li-Polymer and the effect on these being charged when there is still power in them is negligible. Especially for the Li-Polymer ones.
See here about batteries and "memory effect":
http://en.wikipedia.org/wiki/Battery_%28electricity%29#Life_of_rechargeable_batteries
http://en.wikipedia.org/wiki/Memory_effect
Here's more info on types of batteries:
http://en.wikipedia.org/wiki/Li-Ion
http://en.wikipedia.org/wiki/Lithium_polymer_cell
Ericsson T10i -> Nokia 7110 -> Siemens C45, C55, M55, M65 -> Nokia 6131, N73, N82 -> HTC Wildfire, Desire HD -> Nokia Lumia 800 -> HTC Desire X -> Lumia 820 -> Sony Xperia SP -> Lumia 925 + Sennheiser CX 500
If I've helped, use the Kudos button to thank

What are the sequence of function modules executed in payroll result

Dear all,
what are the sequence of function modules executed while retrivieng pryroll result.or
functionmodule sequence in payroll programming.
By
bose

Hi Bose,
The sequence of FM executed in payroll result are
1. cu_read_rgdir ---> from this u will get the country key.
2. cd_read_last -
> from this fm u will identify the seqnr for the latest record and finally for the payroll result
3. pyxx_read_payroll_result.

How important are the Cache Backup Battery Modules

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