[SOLVED] How can I create raid 1 - Centos 5.7 64 minimal installation
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Its usually more flexible to build a RAID out of partitions than whole drives. So make sdb1 and sdc1 partitions using gparted, then use mdadm to make them a RAID 1. gparted is graphical and easy to use, but not included by default in most Redhat installations (I wonder why?) mdadm is command line and should be installed.
When I did this recently I did not use the whole disk. I created empty boot and OS partitions at the beginning of the drives in case I wanted to boot from the RAID in the future. So in my case the large RAID partitions were sdb3 and sdc3. I also didn't use all of the space. When you have to replace a drive, you will find out that the new drive will not have the exact same number of blocks as the old drive. If a partition is even 1 block smaller, it won't work as a replacement. Also, you may have a need for some free space, such as for swap. Also, unless something has changed, the max partition size is 2TB. You need to use larger block sizes than 512 bytes to go above that. Probably simpler to just make a couple of 2TB partitions.
"ext2" is also a typo right?
"Yes" to the /etd/mdadm.conf.
My only remaining thought... (Hmmmmmm) is the "physical/logical" sector sizes.
Some newer large capacity drives are using larger physical sector sizes. The ST33000651AS uses 512byte sectors - so, in this case it is not an issue. But, something to think about - should you ever re-use this knowledge.
Last edited by davemguru; 11-20-2011 at 04:04 AM.
Reason: spelling correction