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I have a Dell R620 with a PERC RAID controller (lspci shows "RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 05)").

I had placed a single disk in it, made it a "RAID0" raid level logical disk (which is a stripe with only one stripe). I put a filesystem on it, used it- but I always intended to mirror it.

Fast forward a month, and I now have a second disk. How do I add this disk and magically create a RAID1 (mirrored) array from my RAID0 array?

Prefer not to have to bring down my system.

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This is for CentOS 7, but similar actions can be performed on other Linux versions I'm sure (left as an exercise for the reader):

Put your new disk in the system (presuming it's hot-swappable. If not, you shouldn't be here).

Set up the Dell OMSA repo; create /etc/yum.repos.d/dell-omsa-repository.repo:

[dell-omsa-indep] name=Dell OMSA repository - Hardware independent type=rpm-md mirrorlist=http://linux.dell.com/repo/hardware/latest/mirrors.cgi?osname=el$releasever&basearch=$basearch &native=1&dellsysidpluginver=$dellsysidpluginver gpgcheck=1 gpgkey=http://linux.dell.com/repo/hardware/latest/RPM-GPG-KEY-dell http://linux.dell.com/repo/hardware/latest/RPM-GPG-KEY-libsmbios enabled=1 failover=priority bootstrapurl=http://linux.dell.com/repo/hardware/latest/bootstrap.cgi

[dell-omsa-specific] name=Dell OMSA repository - Hardware specific type=rpm-md mirrorlist=http://linux.dell.com/repo/hardware/latest/mirrors.cgi?osname=el$releasever&basearch=$basearch &native=1&sys_ven_id=$sys_ven_id&sys_dev_id=$sys_dev_id&dellsysidpluginver=$dellsysidpluginver gpgcheck=1 gpgkey=http://linux.dell.com/repo/hardware/latest/RPM-GPG-KEY-dell http://linux.dell.com/repo/hardware/latest/RPM-GPG-KEY-libsmbios enabled=1 failover=priority bootstrapurl=http://linux.dell.com/repo/hardware/latest/bootstrap.cgi

Do: yum cleanall; yum make cache Install the srvadmin-omacore package, and whatever packages it wants with it.

Study your system; again Your Mileage May Vary:

Show all controllers: omreport storage controller

Show all Virtual (Logical) disks: omreport storage vdisk

Show all physical disks on controller 0: omreport storage pdisk controller=0

Show all logical disks on controller 0: omreport storage vdisk controller=0

Show all physical disks on vdisk with ID 1: omreport storage pdisk controller=0 vdisk=1

Now assuming your RAID (aka Virtual Disk) is on Controller 0, and assuming its ID is 1, and assuming your physical disks have IDs of 0:0:2 and 0:0:3, do this:

omconfig storage vdisk action=reconfigure controller=0 vdisk=1 raid=r1 pdisk=0:0:2,0:0:3

The process took over 24 hours for me, for 1TB 2.5" SAS drives. Much of that time, omreport continued to call the array "RAID0" until it had finished the reconfiguration. Then it had to make another housekeeping pass which took about an hour or two.

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