Hi,
I’m currently running a mixed RAID 10 setup with 4 hard disks ( 2 x 500 GB, 2 x 320 GB ) . I’ve recently purchased an Intel 520 240 GB SSD and am thinking on cutting down on the number of disks in use. I intend to end up with the SSD running standalone and a ‘media’ RAID 1 array based on the two 500 GB disks. Of course, the transition will be fun, and that’s what I want to ask advice on.
First of all, some information about my current setup:
$ cat /proc/mdstat
Personalities : [raid10]
md0 : active raid10 sdd2[4] sdc1[6] sda1[5] sdb1[1]
606256128 blocks super 1.2 256K chunks 2 far-copies [4/4] [UUUU]
$ df -h | grep -v tmpfs
Filesystem Size Used Avail Use% Mounted on
/dev/sdd1 95G 49G 46G 52% /
/dev/md0 569G 336G 205G 63% /mnt/md
# fdisk -l
Disk /dev/sda: 320.1 GB, 320071851520 bytes, 625140335 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000c1830
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 625139711 312568832 fd Linux raid autodetect
Disk /dev/sdb: 320.1 GB, 320071851520 bytes, 625140335 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000f2c4b
Device Boot Start End Blocks Id System
/dev/sdb1 2048 625139711 312568832 fd Linux raid autodetect
Disk /dev/sdc: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000c05f1
Device Boot Start End Blocks Id System
/dev/sdc1 2048 606261247 303129600 fd Linux raid autodetect
/dev/sdc2 606261248 608364543 1051648 82 Linux swap / Solaris
Disk /dev/sdd: 500.1 GB, 500106780160 bytes, 976771055 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0007a5e3
Device Boot Start End Blocks Id System
/dev/sdd1 * 2048 201326591 100662272 83 Linux
/dev/sdd2 201326592 826464255 312568832 fd Linux raid autodetect
Disk /dev/md0: 620.8 GB, 620806275072 bytes, 1212512256 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 262144 bytes / 1048576 bytes
My current plan is the following
- Backup everything to another machine
- Go to runlevel 3
- Turn off swap ( so that /dev/sdc2 is unused )
- Remove /dev/sdc1 from the RAID 10 array . Now /dev/sdc is completelty available
- Create a degraded RAID 1 array ( /dev/md1 ) with /dev/sdc only
- Transfer everything from /dev/md0 to /dev/md1
- Shutdown, remove /dev/sda and /dev/sdb from the system
- Install the SSD drive
- Fresh installation of 13.1
- Sync any data that is needed from /dev/sdd1 ( the former / partition )
- Drop all data from /dev/sdd , and add it to the new RAID 1 array
At this point I should be all set. Is there anything I’m missing? Can I do things in a safer/faster way?