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admin
Site Admin
Joined: 01 Jan 1970
Posts: 269
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 Posted: Sun Jan 15, 2006 10:44 am Post subject: Raid Qs |
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Question: Thanks for sharing, U make me feel better already. Reason we need RAID 0+1 is because the development team is going to install Oracle 9i db in it, and 0+1 is the recomended spec by the Oracle people.
I neeed clarification for task no 2 - Earlier you suggested adding 3 new drive for a new RAID5 partition. Can you suggest how do I insert additional 3 new drive into the server slots while 4 slots are already occupied (leaving me with 2 empty slots)?
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Followup To
Question -
Hi there,
I am a technical support staff and recently my IT manager assigned me 2 new task - both involving server RAID setup on a IBM x series. This is something I am not familiar since I work more with XPs and 2000s.
1) Can U shed me some light on setting up 4 SCSI HD with RAID 0+1 configuration on a IBM x235. The server has an Adaptec RAID 6 controller in it.
2) Yet another case - our IBM x232 with 4 x 18.2Gb SCSI HD, RAID5 config is running out of space. Can I add additional 2 x 32 Gb HD into the array? This server has a RAID controller in it, what tool do I need to rebuild?
Thanks!
Answer -
I am not familiar with the IBM X series but I am familiar with RAID etc. I bet that the IBM is mush like the Dells and Compaqs I am used to. Usually you configure a RAID volume on bootup. A controller will initialize and say something like "press f8 to enter adapter setup". Do that. From here you can control the array. Especially if the IBM has an adaptec controller this will be very easy. RAID 0+1 means that 2 drives are in a raid 0 which has NO fault tollerance but have faster seek time and that there are 2 sets of these RAID 0 volumes that are identical copies of each other. I prefer either RAID 1 or RAID 5. I don't like 0+1 because it wastes space like RAID 1 and is even more complex and sensitive than RAID 5. As far as tools the SCSI bios should let you do everything. There often are software packages from the manufacturer that will let you edit the array from a runing OS but they are different from vendor to vendor.
2. You can add additional drives without rebuilding but you must keep that partition on each drive the same. So if you add a 36 gig drive and the existing drives are 18Gig you will only use 18Gig of the new drive and you will have wasted space. You might want to add 3 drives at 36Gb as a new RAID 5 partition and have a new drive letter available in windows.
Answer: Well if they require raid 0+1 then check and make sure the card supports it. It may or may not. For #2 I didn't realize you were out of slots. You can still add 2 drives but you will have to use only 18GB partitions on each. So you will add an additional 36GB total. Since it's RAID 5 that would be 36 * 2/3 or 24GB of usable space. 1/3rd of the disk space added is used for parity. |
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