dnk wrote:
Hi there, I have a system with the following:
# fdisk -l
Disk /dev/sda: 80.0 GB, 80000000000 bytes 255 heads, 63 sectors/track, 9726 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System/dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 9471 75971385 83 Linux /dev/sda3 9472 9726 2048287+ 82 Linux swap / Solaris
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System/dev/sdb1 * 1 121601 976760001 fd Linux raid autodetect
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System/dev/sdd1 * 1 121601 976760001 fd Linux raid autodetect
Disk /dev/md0: 1000.2 GB, 1000202174464 bytes 2 heads, 4 sectors/track, 244189984 cylinders Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md0 doesn't contain a valid partition table
Now I just added a new hard drive (sdc).
I was wondering how to go about (if possible) to add this drive to my existing partitions with LVM.
Now I never setup this system (Another person had), and if i am reading the above right, it appears as though they did not use LVM for the raid.
The system has the OS on a standalone drive, the home folder is on the two raided drives. I was hoping to extend my home folder to take advantage of my new drive.
Recommendations?
WHat size is the new disk? If it's 1GB, you have many options. If not, there will be trade offs getting it into your system.
If 1G, then
- add disk to md0 for 3 way mirror. no increase in space, added safety/redundancy, current data kept.
- convert to raid5 increase in space, slight reduction in safety/redundancy, current data kept.
- convert all to LVM flexible, largest storage, no redundancy, current data kept.
- convert to raid0 fast, largest storage, no redundancy, not flexible as LVM, destroys current data.
If the third disk in not 1GB, then
- convert to any raid available space will be dictated by the smallest device/partition, wastes disk space, same other raid features as above.
- convert all to LVM flexible, largest storage, no redundancy, current data kept.
- keep md0 as is, add sdc as a separate mount. easy, not flexible storage, reduced safety/redundancy, current data kept.
- trade for a 1G disk.