ASM how many Gigs per disk group for performance.

We are migrating from a file system based database 1Tbyte 10.2.0.3 on IBM AIX to a database on Solaris 9 10.2.0.3 with ASM.
Our old system functioned well by breaking up the IO into 15 file system 72.5 GB each over three SAN arrays.
We have no experience of ASM and are wondering if we should break up the IO in a similar way for performance or just have one large disk group? There must be advantages/disadvantages one way or another. Looking for advise.
Thanks very much in advance for any help.

ASM performs striping automatically so you don't need to care about creating multiple disk groups for performance. But if you have different disks in terms of speed and size, then create individual groups for each disk.
http://youngcow.net/doc/oracle10g/server.102/b14231/storeman.htm#i1014729

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I just purchased a G3 phone. I only signed up for 1/2 gig of data because I will only be using the phone for talking and occasional texting. I won't use the internet at all. (And won't be using any apps, email or anything.) Somebody advised me that 1/2 gig will not be enough -- that I will need 2 gigs -- even if I'm not using internet. They said that data is constantly being used, every time I use the phone. Is this true? Will I need to update to 2 gigs? Any opinions or advice on this will be greatly appreciated. Thank You.

I'm confused as to why you would upgrade to a smartphone with no intention to use the Internet features. There are many wonderful apps out there that keep you informed (most newspapers, radio stations, tv stations have apps), help you keep track of your personal finances (credit cards, bank accounts, etc), navagation apps (no need for a separate gps anymore!), share files, etc. Even fun things like Shazam, where you hear a song and you just need to know who's performing it!
1 GB should be fine for light users. I use Chrome a lot and watch some videos, plus I am always reading the newspapers online and checking twitter, instagram, etc. I have trouble connecting to Xfinity wifi hotspots with my G3, and I am not constantly around places that offer wifi.
Just make sure you have the phone set to only update apps over wifi. And restrict background data on apps as well. That should eliminate a lot of phantom/unnecessary data usage.
I use about 5GB a month. People on unlimited plans who are streaming lots of music and video and transferring files can use hundreds of GBs a month.
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How many disk groups for +DATA?

Hi All,
Does oracle recommends having one big/shared asm disk group for all of the databases?
In our case we going to have 11.2 and 10g rac running against 11.2 ask...
Am I correct in saying that I have to set asm’s compatibility parameter to 10 in order to be able to use the same disk?
Is this is a good idea? Or should i create another disk group for the 10g db’s?
I’m assuming there are feature that will not be available when the compatibility is reduced to 10g...

Oviwan wrote:
what kind of storage system do you have? nas? what is your protocol between server and storage? tcp/ip (=>nfs)? fc?....
if you have a storage with serveral disks then you create mostly more than one lun (raid 0, 1, 5 or whatever). if the requirement is, that you need a 1 TB diskgroup, then I would not create 1 1TB lun, I would create 5x200GB lun's for example, just for the case that you have to extend the diskgroup with a same lun size. if its 1 TB then you have to add another 1TB lun, if there are 5x200GB luns then you can simply add 200GB.
I have nowhere found a document that says: if you have exactly 16 lun's for a diskgroup it's best. it depends on os, storage, etc...
so if you create a 50gb diskgroup I would create just one 50gb lun for example.
hthyes its NAS, connectd using Iscsi. it has 5 disks 1TB each and configued with RAID5. I found below requirments on asm ... it indicates 4luns as minimum per diskgroup, but it doesnt clearify whether its for external redundancy or as mredundancy types.
•A minimum of four LUNs (Oracle ASM disks) of equal size and performance is recommended for each disk group.
•Ensure that all Oracle ASM disks in a disk group have similar storage performance and availability characteristics. In storage configurations with mixed speed drives, such as 10K and 15K RPM, I/O performance is constrained by the slowest speed drive.
•Oracle ASM data distribution policy is capacity-based. Ensure that Oracle ASM disks in a disk group have the same capacity to maintain balance.
•Maximize the number of disks in a disk group for maximum data distribution and higher I/O bandwidth.
•Create LUNs using the outside half of disk drives for higher performance. If possible, use small disks with the highest RPM.
•Create large LUNs to reduce LUN management overhead.
•Minimize I/O contention between ASM disks and other applications by dedicating disks to ASM disk groups for those disks that are not shared with other applications.
•Choose a hardware RAID stripe size that is a power of 2 and less than or equal to the size of the ASM allocation unit.
•Avoid using a Logical Volume Manager (LVM) because an LVM would be redundant. However, there are situations where certain multipathing or third party cluster solutions require an LVM. In these situations, use the LVM to represent a single LUN without striping or mirroring to minimize the performance impact.
•For Linux, when possible, use the Oracle ASMLIB feature to address device naming and permission persistency.
ASMLIB provides an alternative interface for the ASM-enabled kernel to discover and access block devices. ASMLIB provides storage and operating system vendors the opportunity to supply extended storage-related features. These features provide benefits such as improved performance and greater data integrity.
one more question about fdisk partitioning. is it correct that we should only create one partition per luns (5x200Gb luns in my case) is it because this way i will have more consistent set of luns( in term of performance)?

How do I define 2 disk groups for ocr and voting disks at the oracle grid infrastructure installation window

Hello,
It may sound too easy to someone but I need to ask it anyway.
I am in the middle of building Oracle RAC 11.2.0.3 on Linux. I have 2 storage and I created three LUNs in each of storage so 6 LUNs in total look in both of servers. If I choose NORMAL as a redundancy level, is it right to choose my 6 disks those are created for OCR_VOTE at the grid installation? Or should I choose only 3 of them and configure mirroring at latter stage?
The reason why I am asking this is that I didn't find any place to create asm disk group for ocr and voting disks at the oracle grid infrastructure installation window. In fact, I would to like to create two disk groups in which one of groups contains three disks those were brought from storage 1 and the second one contains rest three 3 disk that come from the last storage.
I believe that you will understand the manner and help me on choosing proper way.
Thank you.

Hi,
You have 2 Storage H/W.
You will need to configure a Quorum ASMDisk to store a Voting Disk.
Because if you lose 1/2 or more of all of your voting disks, then nodes get evicted from the cluster, or nodes kick themselves out of the cluster.
You must have the odd number of voting disk (i.e 1,3 or 5) one voting disk per ASM DISK, So 1 Storage will hold more voting disk than another storage.
(e.g 3 Voting Disk - 2 voting stored in stg-A and 1 voting disk store in stg-B)
If fail the storage that hold the major number of Voting disk the whole cluster (all nodes) goes down. Does not matter if you have a other storage online.
It will happen:
https://forums.oracle.com/message/9681811#9681811
You must configure your Clusterware same as RAC extended
Check this link:
http://www.oracle.com/technetwork/database/clusterware/overview/grid-infra-thirdvoteonnfs-131158.pdf
Explaining: How to store OCR, Voting disks and ASM SPFILE on ASM Diskgroup (RAC or RAC Extended) | Levi Pereira | Oracl…

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Hello,
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The update option "Sync Music - Selected playlists" is useful if you are using an iPod with a smaller capacity than what you have stored in iTunes. You can tell from the playlist just how much space the songs will take up by clicking on it, the information appears at the bottom of your screen.
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Macistotle wrote:
Unless you have DRM still haunting your tunes ... Then you can only use those songs on 5 devices. Otherwise, connect as many as you like (as stated above).
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ASM how many Gigs per disk group for performance.

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