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тАО07-12-2002 08:35 AM
тАО07-12-2002 08:35 AM
Solved! Go to Solution.
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тАО07-12-2002 09:03 AM
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тАО07-12-2002 09:05 AM
тАО07-12-2002 09:05 AM
Re: pro and cons
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тАО07-12-2002 09:07 AM
тАО07-12-2002 09:07 AM
Re: pro and cons
Oracle won't really care if the disk is internal or external.
With multiple connections to the external storage (eliminates single point of failure), balance the disk usage across the connections.
Using vgextend, you can add primary and alternate paths. For the first pair, use cXdYtZ and cAdBtC. For the second pair, reverse the order to cAdBtC and cXdYtZ.
Just some thoughts...
Tom
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тАО07-12-2002 09:15 AM
тАО07-12-2002 09:15 AM
Re: pro and cons
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тАО07-12-2002 09:38 AM
тАО07-12-2002 09:38 AM
Re: pro and cons
There are may aspects in this :
1. Looking from the point of view of the operating system
2. Looking from the Oracle side
Internal disks uses the inbuilt SCSI controllers and depending upon the server which you are using and how many disk are installed on the controllers the I/O increases or decreases.
The same way even if you install the oracle on the external disk ( that is the disks in the array ) then here also the same problem is there. Whether you are using fiber channel cards or PCI SCSI cards for connecting the disk array. How many disks are there in the array which are handled by the SCSI controller.
Generally changing the SCSI hhd on the disk array is simple and depending on the array you are using it can be changed online. Many servers do support the online replacement of the internal hdds also. Some arrays have raid 5 configured and hot spare hdd configured and hence the hdd failure may not lead to any downtime.
Piyush
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тАО07-12-2002 10:01 AM
тАО07-12-2002 10:01 AM
Re: pro and cons
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тАО07-12-2002 10:17 AM
тАО07-12-2002 10:17 AM
Re: pro and cons
To get Oracle performance.
The "classic" metod to get high performance on a database is to distribute the database over several disk. This can be for secutity reasons too and it is still true when using ordinary disks. This needs a well-planned database layout to get equal load on the disks. With RAID disks the controller takes care of the "distribution" and security. To get Oracle performance with RAID:
- Select a RAID disk with high IO-rate (IOPS) rather then high transfer rate.
- Configure the RAID-sets with RAID-level 1+0.
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тАО07-12-2002 02:13 PM
тАО07-12-2002 02:13 PM
Re: pro and cons
just a few points:
- if your internal disks are connected through a slower controller than your external drives, use the external ones
- if the speed is the same, use the disks on the bus with fewer drives
- if the amount of drives is (almost) equal use the faster disks
- if downtime (or uptime) is important to you, use the drives, which are *hot* pluggable
- use the bus where you can stripe over *more* drives
So it all depends ;-)
Regards,
Wodisch