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IBM SCSI hard disk

Posted on 2004-03-24
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Last Modified: 2010-04-13
hi, all

my server have four slots, i used have 2 IBM SCSI 36.7GB.(IBM Ultrastar 80pin 160 10000RPM)

Recently I ordered another two IBM SCSI disk, it said 36GB...(after i received it, i found "IBM Eserver 80pin 160 10000RPM")

After i start the server into array setup , it shows..2 of 36.4GB, another 2 is 36.7GB.

1)Could this four SCSI disks could be set into RAID-5? Does it requires all Independent  disk to be the same size?

2)If i have 4 disks into RAID-5, what will be the total size? how to allocate to different partitions...like c: xxGB...D:xxGB...
BTW, win 2k server will be installed.

3) it says 'hot-swap'...is that means i could pull the SCSI disk out without turing off the power?
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Question by:robinyanwang
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Fatal_Exception earned 500 total points
ID: 10672993
Ok..  

1..Yes you can use the 4 disks in a RAID 5 array..  it will use the smaller of the disk space to create these..

2.  The total size of a RAID 5 is the combination of the drives - one..  so you will have approx. 108 Gb's of space available..

3.  correct..  hot swap means exactly that..  It can be swapped out on the fly, if a disk goes bad..  

That being said, if you make one of the disks a hot swap drive, then you will only have 3 disks in the array, for a total of approx. 72 Gb's of space..

FE
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by:Fatal_Exception
ID: 10672998
Oh..  you can create volumes (partitions) within windows after the OS loads...  I tend to like to use 10-15 GB's for my system partition, and then create other partitions as you deem necessary for your file structure..  
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by:robinyanwang
ID: 10673291
Very good!

I use Four 36.4GB....total is 104,143MB

I use Three 36.4GB and One 36.7GB....total is 104,143MB also

The hot swap is very cool.

Thanks a lot!!!
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by:Fatal_Exception
ID: 10673313
Not quite sure about your last comment..   Remember that if you put 3 disks in a RAID 5 array, you will basically have only 2/3 of the total disk space available..  1/3 of the space is used for recovery purposes or what we call parity protection..   If you Google for RAID 5 you will find an abundance of info on these...

Glad to see we could help..   if you run into trouble, come on back and ask...

Thanks..

FE
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Author Comment

by:robinyanwang
ID: 10673345
you did not read very clearly...:)

I mean use 4x36.4GB or 3x36.4GB+1x36.7GB, the total RAID-5 size is the same...

Have a good night.
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by:Fatal_Exception
ID: 10673649
Ok..  thanks again, and a good week to you to...

FE
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