2 newbies question about diskgroups

Hi gurus,
I have 2 newbies question:
Im working in a RAC Database ( on Redhat 5.3 with some disk groups. One of this groups have 6 disks on it with different space (134, 236G, 236G, 185G, 185G and 185G).
My questions are:
1) What would be happend when the lower space disk will be full?
2) At this moment the diskgroups are at 45% so i was thinking to change their spaces to have all with the same space (around 193G each), it would create any problem? i should restart database or can do it with database up?

if a disk is filled, what would happen? could i resize the disks with same size without stop database and without affecting the data stored within each disc?
By the word 'disk' I assume you mean LUN . When a LUN in a disk group is filled, ASM will use the remaining LUNs to store the data. You should always use LUNs of uniform size to avoid uneven I/O .
could i resize the disks with same size without stop database and without affecting the data stored within each disc
You can get the Unix/Storage team to allocate more LUNs for this Server. Once these LUNs are added , check if the following pre-reqs are met for the LUN which is yet to be added to the disk group
v$asm_disk.PATH = /dev/rdsk/youLUNname
v$asm_disk.NAME will be NULL
Now you can add the LUNs using
alter diskgroup DATA_DG01 add disk '/dev/rdsk/youLUNname' rebalance power 4 ; wait for rebalance to finish (check status in V$ASM_OPERATION)
Yes. The above can be done without stopping the DB. It won't affect the stored data either.

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    Not so much. Like most things in programming (or life, for that matter), the Terminal is something not to mess with +if you don't know what you're doing+. Basically, it breaks down like this. The GUI that Apple has created for you in Mac OS X (by GUI I mean "graphical user interface" -- the icons and windows and buttons and so forth that you use to perform tasks on your Mac -- in other words, everything outside the Terminal) is geared toward the common user who does not need to access advance aspects of the system's functionality. Consequently, it makes common tasks much simpler to perform, but in the process it hides some of the deeper levels of the system's functionality from the user. This is a good thing, since most people wouldn't know what to do with this functionality and would create problems for themselves if they did have easy access to it. However, for some users who know more about the inner workings of the operating system, there needs to be a way for them to access this functionality, so that they can do certain things (like accessing certain files and performing certain tasks) that they would not be able to do using the Mac OS X GUI -- that's what the Terminal is for. It allows the user to operate the system on a lower level. In other words, it allows you to get closer to the operating system. This is good in a way, because it allows you to perform tasks that you wouldn't otherwise be able to perform by giving you more control over the operating system, but it is also bad in a way, because it can allow you to mess up some of the deeper aspects of your system if you don't know what you are doing. Most people leave the Terminal alone for this reason, and because they have no need of it, but if you want to be a good developer, you're going to have to work with it sooner or later.
    Now, with all that being said, it's not that easy to mess things up using the Terminal. It's not like your system's going to crash if you misspell a command. All in all, the Terminal is very forgiving, but it will do what you tell it to do, even if you tell it to kill itself, and it is for that reason that you need to know what you are telling it before you try to tell it something. If you understand what you are telling the system, than operating on a lower level and being closer to the operating system is completely safe.
    The Mac OS X operating system is based around Unix, so when you are communicating more directly with the operating system by using the Terminal, you are interacting with its Unix core. For this reason, using the Terminal goes hand in hand with understanding Unix. So, if you're going to want to use the Terminal, then I recommend you get a good book on Unix to teach you the basics of Unix commands and shell programming and whatnot. Any book on Unix will do, since more or less everything you learn will be applicable to the Mac OS X's Terminal, but there are a few that are specifically directed to Mac OS X users, and that always makes things easier. Most of these books aren't updated to cover past Tiger, but this really doesn't matter (someone correct me if I'm wrong). A few examples are O'Reilly's "Learning Unix for Mac OS X Tiger" by Dave Taylor or Peachpit Press's "Unix for Mac OS X Tiger" by Matisse Enzer. Also, the book "Unix Programming Environment" by Kernighan and Pike is an excellent book on Unix, although fairly outdated, so I would highly recommend it, although I would recommend it as a supplement to another, more recent, Mac-based Unix book and not as your primary source for learning Unix. The skills you will acquire from these books will help you later if not sooner, so I recommend giving one of them a read at some point, whether you are planning on compiling using the Terminal right now or not.
    Anyways, I hope this helped to clear some of this up for you, and please let us know if you have any further questions.

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