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тАО01-10-2001 12:10 PM
тАО01-10-2001 12:10 PM
I'm not sure why they want Raid 3. I know they have a lot of data to load.
I believe the FC60 supports a Raid Level 1+0. Can anyone tell me for sure and how is a Raid Level 1+0 configured. I heard it is better than Raid 5. Is this true? Does a 1+0 use mirroring?
Thanks in advance.
Solved! Go to Solution.
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тАО01-10-2001 05:12 PM
тАО01-10-2001 05:12 PM
Re: Disk Array FC60
Raid 1/0 is a combination of Raid 0 and Raid 1.
Remember that Raid 0 uses striping to achieve igh performance and Raid 1 uses hardware mirroring to obtain data redundancy.
Speed advantage of striping plus redundancy advantage of mirroring are combined together.
A Raid 1/0 LUN caontains an even number of disk drives from 4 to 30 disks.
One half of the disks are primarys and the other half are mirrors.
For High availability, each disk in the pair must be in a different enclosure.
There're three ways of configuring the array as Raid 1/0 on FC60.
One is manually, another is to use sam and the third is through STM.
A simple example of manually configured Raid 1/0 is as follows.
Syntax:
#amcfg -L
#amcfg -L B:1 1:3,1:4,2:3,2:4 -r 1 -s 4 arrayID
If you select RAID 1 with more that 2 disks, then Raid 1/0 is created.
This example shows that the LUN is owned by controller B, is assigned LUN number 4 and stripe segment size is 4 Kbytes.
Please note that example selects disks in seperate enclosures to create mirrored pairs.
You can do this throughout both sam and STM.
Regards,
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тАО01-11-2001 05:14 AM
тАО01-11-2001 05:14 AM
Re: Disk Array FC60
I just received an email from the customer stating that Oracle responds better under RAID 3 than RAID 5.
Is this true? Because I thought RAID 5 was better than RAID 3.
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тАО01-11-2001 08:14 AM
тАО01-11-2001 08:14 AM
Re: Disk Array FC60
I would never put an Oracle database in RAID5 (especially the redos and archives), unless it was a read-only DSS type database that gets loaded periodically.
I'm not sure what they are trying to acheive with the RAID3, I would stick with the RAID 1/0 if you have the space for it, it's the fastest.
Tim
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тАО01-11-2001 10:03 AM
тАО01-11-2001 10:03 AM
Re: Disk Array FC60
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тАО01-11-2001 12:49 PM
тАО01-11-2001 12:49 PM
SolutionHere's a link do a document which describes RAID in detail. Maybe it can help answer your question:
http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html