Hi, I would greatly appreciate some insight here.
Ubuntu 16.04 LTS
$ uname -a
Linux hostname 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
$ mdadm -V
mdadm - v3.3 - 3rd September 2013
RAID1 configuration of 2 SSDs.
Fresh install of Ubuntu 16.04LTS using the installer to create the RAID1
with 3 partitions (/boot,swap,/)
Output of cat /proc/mdstat after installation:
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
[raid10]
md2 : active raid1 sda3[0] sdb3[1]
634795008 blocks super 1.2 [2/2] [UU]
bitmap: 0/5 pages [0KB], 65536KB chunk
md1 : active raid1 sda2[0] sdb2[1]
126887936 blocks super 1.2 [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md0 : active raid1 sda1[0] sdb1[1]
19514368 blocks super 1.2 [2/2] [UU]
unused devices: <none>
Question 1: why is there no bitmap for md0 which is /boot?
Next : To simulate a failure, I removed sdb from the array, then physically
removed it and installed a new disk in the same physical slot.
I partitioned the new disk, synced it to the remaining disk (sda)
then grubed it.
the output of cat /proc/mdstat after is:
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4]
[raid10]
md2 : active raid1 sdb3[1] sda3[0]
634795008 blocks super 1.2 [2/2] [UU]
bitmap: 0/5 pages [0KB], 65536KB chunk
md1 : active raid1 sdb2[1] sda2[0]
126887936 blocks super 1.2 [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md0 : active raid1 sdb1[2] sda1[0]
19514368 blocks super 1.2 [2/2] [UU]
unused devices: <none>
Question 2: why is number in [] for md0, sdb1 now=2 when before it was 1?
Question 3: Why didn't the numbers for sdb2 and sdb3 change ?
Question 4: Does it matter what the number are? Is this an indication of a
problem?
Question 5: Does this posting pertain here?
http://www.spinics.net/lists/raid/msg49766.html
Thank you for any information or direction,
Pete Sangas
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