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Issues with Installation of RAC on Solaris 10 [message #295933] Wed, 23 January 2008 23:38 Go to next message
kamragulshan
Messages: 63
Registered: May 2005
Location: Delhi
Member
Hi Experts,

We are in the process of installation of Oracle 10g RAC on Solaris 10 and storage is SAN.

I read a few documents of installation of RAC. Now i have a few doubts.

1. We need to create OCR and Voting disk.
Do we need to create OCR and Voting disk on SAN by creating 2 LUN's of 100MB each. The existing database size is around 1TB, so is the space of 100MB enough. One more thing, do we require to create both OCR & VD in a mirrored fashion, we are already having RAID 5 configured on SAN, if yes, then how.
2. What should be the value of kernel parameters (we are having 16GB RAM on both nodes)
3. Whether we should install the Oracle on both the nodes individually or should keep it on SAN.

Please provide valuable inputs on the above.

Thanks in Advance
Gulshan

[Updated on: Thu, 24 January 2008 00:43] by Moderator

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Re: Issues with Installation of RAC on Solaris 10 [message #296147 is a reply to message #295933] Thu, 24 January 2008 20:19 Go to previous messageGo to next message
ebrian
Messages: 2794
Registered: April 2006
Senior Member
1 & 2 can be answered by OracleŽ Database Oracle Clusterware and Oracle RAC Installation Guide for Solaris Operating System.

As for the Oracle binaries on the SAN, if something gets corrupt with the Oracle binaries, it could affect all instances. In addition, rolling upgrades are out of the question.
Re: Issues with Installation of RAC on Solaris 10 [message #301781 is a reply to message #296147] Thu, 21 February 2008 13:17 Go to previous messageGo to next message
DreamzZ
Messages: 1666
Registered: May 2007
Location: Dreamzland
Senior Member
Quote:
1. We need to create OCR and Voting disk.
Do we need to create OCR and Voting disk on SAN by creating 2 LUN's of 100MB each. The existing database size is around 1TB, so is the space of 100MB enough. One more thing, do we require to create both OCR & VD in a mirrored fashion, we are already having RAID 5 configured on SAN, if yes, then how.


The size matters if you have any plan in future to extend your nodes e-g

If you have two nodes only and you want to go upto maximum
of 4 nodes any time in future and you decided a partition size of 200MB for CRS disks (OCR and Voting
disks), then formatting these partitions with a Number of Cluster Node value equal to 4 will result in 19MB
disk consumption at the time of formatting as shown below:

[root@rac1pub ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 197M 19M 178M 10% /oradata/data05

Whereas if you format the same partition with a value of 10 for the Number of Cluster Nodes, you will get a
consumption of almost 170 MB at format time! e.g.

[root@rac1pub ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 197M 178M 19M 90% /oradata/data05

Definitely this is going to create huge problem for you when you will be running the Oracle Clusterware
OUI
and it will complaint you of not having enough free space in the OCR and Voting disk partitions. You may be
pulling your hair at that time as the disk usage command “du -sh /oradata/data05” will be showing
you that Zero KB has been used in this partition!
[root@rac1pub ~]# du -sh
/oradata/data05
0k /oradata/data05



Quote:
2. What should be the value of kernel parameters (we are having 16GB RAM on both nodes)


The correct value for kernel.shmmax parameter can be found out with the following formula:
( (Total RAM in Bytes / 2) - 1 )

e-g 4gigs
( (4294967296 / 2 ) - 1)= 2147483648 – 1 = 2147483647
Re: Issues with Installation of RAC on Solaris 10 [message #301808 is a reply to message #301781] Thu, 21 February 2008 17:18 Go to previous messageGo to next message
ebrian
Messages: 2794
Registered: April 2006
Senior Member
As indicated in the link I provided above, minimum size for OCR & vote should be 256MB. The setting for shmmax is really going to be dependent on the platform RAC is being installed on. For 32-bit, the size is going to be limited regardless of the memory in the box, whereas on 64-bit the size get be much higher. All the recommended kernel parameter settings are listed in the link I provided above.
Re: Issues with Installation of RAC on Solaris 10 [message #301892 is a reply to message #295933] Fri, 22 February 2008 03:10 Go to previous messageGo to next message
kamragulshan
Messages: 63
Registered: May 2005
Location: Delhi
Member
Thanks to all of you for the reply and help me to understand the space requirement for OCR & Voting Disk.

I have create OCR disk -> 300MB and Voting Disk -> 1GB and the SHHMAX size -> 8589934592 and according to the formula defined by Dremzz the value should be 8589934591.

Dremzz: You have clearly explained the minimum space required for OCR and Voting disk but still i did not understand clear. Could you please explain that how you have calculate 19M & then 178MB.

Thanks
Gulshan
Re: Issues with Installation of RAC on Solaris 10 [message #302059 is a reply to message #301892] Fri, 22 February 2008 18:19 Go to previous message
DreamzZ
Messages: 1666
Registered: May 2007
Location: Dreamzland
Senior Member
Check this document.

http://www.4shared.com/file/38649238/9439ce39/oracle_rac_on_iscsi_20070612.html
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