I'm trying to create a new storage repository on a server that already has 2 old hard disks, set up with hardware RAID 1. It's my first time doing this in Xen Server environment so I wanna be extra careful not to mess up anything or lose the data on old hard disks.
There are 4 3TB Hard disks on this machine, so with raid one I will be having 6TB
I've inserted the two new hard disks to the computer, went to bios's Raid Controller, created a new virtual disk (RAID 1 again), and now I'm ready to create a file system on it and mount it in Citrix Xen Server
First I'd like to know what is the device name, is it sda, sdb, or sdc
When I run fdisk -l to see the currently available drives I see these:
fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 128.8 GB, 128849018880 bytes 256 heads, 63 sectors/track, 15603 cylinders Units = cylinders of 16128 * 512 = 8257536 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 15604 125829119+ ee EFI GPT WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdb: 2871.1 GB, 2871185637376 bytes 255 heads, 63 sectors/track, 349068 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdb doesn't contain a valid partition table Disk /dev/sdc: 3000.0 GB, 3000034656256 bytes 255 heads, 63 sectors/track, 364733 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/sdc doesn't contain a valid partition table
My understanding is that when you do RAID 1, your hard disk is going to be shown as 1 disk to your operating system, since I've added the new hard disks to the drive AFTER the first two were installed, I guess the device name is /dev/sdc
I have data on the old hard disks, I also had a look at /proc/partitions following the instructions here: http://support.citrix.com/article/CTX121313
to see what's going on, it seems like there are three partitions on sda, and sdc has not been partitioned.
cat /proc/partitions major minor #blocks name 7 0 51240 loop0 8 0 125829120 sda 8 1 4193297 sda1 8 2 4193297 sda2 8 3 117439471 sda3 8 16 2803892224 sdb 8 32 2929721344 sdc 252 0 4096 dm-0 252 1 472788992 dm-1 253 0 471859200 tda 252 2 1050632192 dm-2 253 1 1048576000 tdb 252 3 262664192 dm-3 253 2 262144000 tdc
The odd thing here is sdb, what is that and why is it there?
I also ran the following command based on the above mentioned article,
ll /dev/disk/by-id total 0 lrwxrwxrwx 1 root root 9 Aug 16 17:51 scsi-36d4ae520990df60017886b6c20ec8db9 -> ../../sda lrwxrwxrwx 1 root root 10 Aug 16 17:51 scsi-36d4ae520990df60017886b6c20ec8db9-part1 -> ../../sda1 lrwxrwxrwx 1 root root 10 Aug 16 17:51 scsi-36d4ae520990df60017886b6c20ec8db9-part2 -> ../../sda2 lrwxrwxrwx 1 root root 10 Aug 16 17:51 scsi-36d4ae520990df60017886b6c20ec8db9-part3 -> ../../sda3 lrwxrwxrwx 1 root root 9 Aug 16 17:51 scsi-36d4ae520990df60017886b87228bff90 -> ../../sdb lrwxrwxrwx 1 root root 9 Aug 16 17:51 scsi-36d4ae520990df60017bed45f1c50e9f5 -> ../../sdc
I still see sdb, and sdc
I am confused, what I expect to see is sda (which is already in use) and sdb (newly installed disk), but I also see sdc.
Does this mean the RAID 1 isn't functioning properly?