add new scsi harddisk to RAID

[chuck77]

Hi all. My server Compaq Proliant using Rehat 6.2. I have 3 scsi harddisk of 18.2gb using Raid 5. Currently, i;ve got an extra 9.1gb harddisk.

Can i use this harddisk to the Raid 5 ?? i need to use this as an independent disk for file storage...

How do i go abt doing it ??

 

[fluid11]

When using RAID 5, all of your hard disks much be the same size. If you really wanted to, you could use different size disks, but each disk would only use 9.1GB of space since that is the smallest hard drive you have. You would have to re-create the array to add the 9GB. I do not recommend doing this as it would be a huge waste of space on the 3 18GB drives you already have.

If you must do RAID with the 4 drives, you may want to look into RAID 0 (disk striping), which doesn't offer any kind of redundancy, but will allow you to use 100% of your disks.


ChrisP ------------------------------------------------------------------------------
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[chuck77]

Is it possible tat i keep the Raid 5 for the 3 18.2gb harddisk. The extra 9.1gb harddisk is mounted as an extra space independent of raid 5...???

I wanna keep the current raid 5 and add this extra disk for storing confidential files....making it raid 0 ??

is it possible ?? or any other option ?

 

[fluid11]

I'm assuming that you are running SCSI disks. Yes, you probably can. The RAID 5 array will be seen as one disk and the extra 9GB drive will be seen as a second disk. You can't do RAID 0 with only 1 hard drive. You need 2 minimum for RAID 0 and 3 minimum for RAID 5. Remember that in RAID 5, one disk is used for parity. That means that if you have 3 18GB disks set in RAID 5, one is used for parity and 2 for storage giving you a total of 36GB of data storage.

I just found this website. It gives you the advantages and disadvantages of each level of RAID and what is required to implement each.


ChrisP ------------------------------------------------------------------------------
If somebody helps you, please click the link in the botton left hand corner that says "Mark this post as a helpful/expert post".

 

[fluid11]

Oops, I forgot to post the link...

http://www.acnc.com/04_01_00.html

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