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Old 08-19-2010, 08:23 AM   #1
RWTH
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Registered: Jul 2010
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How to create RAID1 array with given/fix HD labels


Hi,

I have two HDs (let's say sda and sdb). Both are the same size and have the same partitions already (sda1/sda2/sda3 and sdb1/sdb2/sdb3). Basically they are ready to make a RAID1 array.

Writing with new udev rules, I could create and give fix HD labels with /sbin/scsi_id.

Example: For sdb1 I have a fix device name created under /dev as hd2_boot1, for sdb2 I have /dev/hd2_boot2 and finally for sdb3 I have created the device /dev/hd2_boot3.

With using the command "mdadm --create /dev/md0 --level=1 ....", I could create a RAID array.

But, when I check the status one of the RAID devices, like with the command "mdadm --detail /dev/md2", it still shows me as part of the RAID array the sdb* devices, not the hd2_boot* devices. Something like this:

"1 8 19 1 active sync /dev/sdb3"

I would like to see basically as member or the RAID array always the /dev/hd2_boot3 not the /dev/sdb3 (like above), is this possible?

Bottom line, I would like to keep the order of the RAID arrays depending their scsi ids, not depending their scsi numberings which is given by the kernel, since the scsi numberings (sda, sdb, sdc and etc.) can change depending the physical connection.

Thanks,
RWTH

Last edited by RWTH; 08-19-2010 at 08:26 AM.
 
Old 08-21-2010, 07:49 PM   #2
chrism01
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Registered: Aug 2004
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Distribution: Centos 6.5, Centos 5.10
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Try using the UUIDs; login as root and type

blkid

to get them.
 
Old 08-22-2010, 03:54 PM   #3
RWTH
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Registered: Jul 2010
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Hi chrism01,

I got the UUIDs of each individual drive partition and the md devices. It is interesting, that the each partition of the same HD has different UUID, why is that? Since each partition belong to the sama HD, shouldn't all the partitions on the same HD have the same UUID?

Also, after getting the UUIDs, how should I proceed, in order to create the RAID1 array devices, like I described above?
 
  


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