Title here
Summary here
Replace a RAID1 array drive
- Note: If your RAID array is degraded you will see something like this
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdb1[1] sda1[0](F)
487104 blocks super 1.2 [2/1] [_U]
md1 : active raid1 sdb2[1] sda2[0](F)
976142144 blocks super 1.2 [2/1] [_U]Get information about the hard drive(s)
sudo hdparm -I /dev/sda
/dev/sda:
HDIO_DRIVE_CMD(identify) failed: Input/output errorA healthy drive will show output similar to:
sudo hdparm -I /dev/sdb
/dev/sdb:
ATA device, with non-removable media
Model Number: WDC WD10EZEX-00WN4A0
Serial Number: WD-WCC6Y2ZHZJAH
Firmware Revision: 01.01A01
Transport: Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x001f)
Supported: 10 9 8 7 6 5
Likely used: 10
Configuration:
Logical max current
cylinders 16383 0
heads 16 0
sectors/track 63 0
--
... etcor an alternative command
sudo lshw -class disk -class storage
... etc
*-scsi:0
physical id: 1
logical name: scsi0
capabilities: emulated
*-disk
description: SCSI Disk
physical id: 0.0.0
bus info: scsi@0:0.0.0
logical name: /dev/sda
size: 931GiB (1TB)
configuration: logicalsectorsize=512 sectorsize=512
*-scsi:1
physical id: 2
logical name: scsi1
capabilities: emulated
*-disk
description: ATA Disk
product: WDC WD10EZEX-00W
vendor: Western Digital
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/sdb
version: 1A01
serial: WD-WCC6Y2ZHZJAH
size: 931GiB (1TB)
capabilities: partitioned partitioned:dos
configuration: ansiversion=5 logicalsectorsize=512 sectorsize=4096 signature=000e5fab
... etcand another (possibly the best solution) program;
sudo smartctl -d ata -a -i /dev/sdb
... etc
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Blue
Device Model: WDC WD10EZEX-00WN4A0
Serial Number: WD-WCC6Y2ZHZJAH
LU WWN Device Id: 5 0014ee 20d232e87
Firmware Version: 01.01A01
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 3b
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Mon Jan 30 13:43:46 2017 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
... etcRemove the failed disk from the RAID1 array
In this example, I have 2 disks - /dev/sda and /dev/sdb with 2 partitions on each disk /dev/sda1, /dev/sda2, /dev/sdb1, /dev/sdb2 - and /dev/sda has died. Here is what mdstat looks like
mdadm --manage /dev/md0 --fail /dev/sda1
mdadm --manage /dev/md1 --fail /dev/sda2
mdadm --manage /dev/md0 --remove /dev/sda1
mdadm --manage /dev/md0 --remove /dev/sda2
shutdown -h now- Physically remove the broken disk and install the new one
Add the new disk to the RAID1 array
In this example, I have 2 disks - /dev/sda and /dev/sdb - and /dev/sda has died. Here is what mdstat looks like
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdb2[1]
976142144 blocks super 1.2 [2/1] [_U]
md0 : active raid1 sdb1[1]
487104 blocks super 1.2 [2/1] [_U]
unused devices: <none>Mirror the partitioning scheme from the RAID disk to the new disk
sfdisk -d /dev/sdb | sfdisk /dev/sdaAdd the new disk to the array
mdadm --manage /dev/md0 --add /dev/sda1
mdadm --manage /dev/md1 --add /dev/sda2 Check the recovery status
cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sda2[2] sdb2[1]
976142144 blocks super 1.2 [2/1] [_U]
[>....................] recovery = 0.3% (3282752/976142144) finish=103.7min speed=156321K/sec
md0 : active raid1 sda1[2] sdb1[1]
487104 blocks super 1.2 [2/2] [UU]
unused devices: <none>Install GRUB to the MBR of the new disk
grub-install /dev/sda