Samba share on software raid1

raid, raid1, samba, software, ubuntu

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# 15  
Old 08-31-2018
what also i notice, when deattach disk LIVE when system is running, disk disappear from array after restart, it cant be access.
It is present like /dev/sdb but not in raid...
# 16  
Old 08-31-2018
If you are saying /dev/sdb is not in RAID after a reboot(?) then I would ask, do you have the /dev/md0 mount in /etc/fstab?
# 17  
Old 08-31-2018
Can you tell me what happens if you follow the following tutorial :
How To Create RAID Arrays with mdadm on Ubuntu 16.04 | DigitalOcean

All the setup, with carefull reading and understanding.
Of course, you are creating RAID1 so you can ignore other possible configurations.

Are you sure the disk or disks initialized with mdadm are not mentioned in /etc/fstab. They should not be there, but only meta(MD) device(s).

Also, did you execute as root at the end of operation :
sudo update-initramfs -u

Hope that helps
This User Gave Thanks to Peasant For This Post:
hicksd8 (08-31-2018)
# 18  
Old 08-31-2018
This is exactly tutorial i was follow.
this is fstab last line
/dev/md0 /mnt/raid/ ext4 defaults,nofail,discard 0 0

This is now lsblk
sdb                     1.8T linux_raid_member disk
└─md0                   1.8T ext4              raid1 /mnt/raid
sdc                     1.8T linux_raid_member disk
└─md0                   1.8T ext4              raid1 /mnt/raid

when remove one disk, it is good, i can access my folder via windows, but when get another out, just goes from md0
sdb                     1.8T linux_raid_member disk

and sdc is a part of md0
# 19  
Old 08-31-2018
Please answer the question asked by Peasant about did you run:

# sudo update-initramfs -u

# 20  
Old 08-31-2018
Originally Posted by hicksd8
Please answer the question asked by Peasant about did you run:

# sudo update-initramfs -u

sorry i don't write it.
Yeah, ofcourse.
this is output
sudo update-initramfs -u
update-initramfs: Generating /boot/initrd.img-4.10.0-19-generic

i have notices that in conf file array is /dev/md/0

ARRAY /dev/md/0 metadata=1.2 name=johna:0 UUID=bd34d949:34a3999d:949d6038:a871e1c1

------ Post updated at 06:41 AM ------

i also cant access to my data after deattach one hard drive.

------ Post updated at 06:43 AM ------

THis is output of mdstat
root@myuser:/mnt/raid/test# cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md0 : active raid1 sdc[1] sdb[0]
      1953383488 blocks super 1.2 [2/2] [UU]
      bitmap: 0/15 pages [0KB], 65536KB chunk

unused devices: <none>

------ Post updated at 07:23 AM ------

i now do it like this
i delete array and added like in example. No errors found.
I can see that it is monuted
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/johnas--vg-root  223G  1.4G  210G   1% /
/dev/md0                     1.8T  898M  1.7T   1% /mnt/md0

NAME                    SIZE FSTYPE            TYPE  MOUNTPOINT
sda                   232.9G                   disk
└─sda1                232.9G LVM2_member       part
  ├─johnas--vg-root     227G ext4              lvm   /
  └─johnas--vg-swap_1   5.9G swap              lvm   [SWAP]
sdb                     1.8T linux_raid_member disk
└─md0                   1.8T ext4              raid1 /mnt/md0
sdc                     1.8T linux_raid_member disk
└─md0                   1.8T ext4              raid1 /mnt/md0

I am now waiting to sync and try again to deattach disks and try to copy for example to /home/johnas/something, to see if it is good to go or not.
Just one question.
If I deattach one disk, and restart, it should be also in md0 because i added it in fstab.
# 21  
Old 08-31-2018
Lets just make this clear for the sake of argument.

So, you create a /dev/md0 from /dev/sdc /dev/sdb disks.
You mount it via mount command and add into /etc/fstab.

After reboot (all disks are inside), everything works as expected (mounted and healty).
You poweroff the box, and remove one of the disks from array.
Booting up everything is fine, except lacking one disk you removed.

After you poweroff and replug the drive, power on, there should be still one disk in the md setup. The one you didn't touch should still be part of md device.
Is this correct ?

Point being, if you unplug the drive, that drive is not considired part of array anymore.
When you plug it back, it will not magically rebuild, this has to be done by hand.
And of course, if you plug the other one out, and leave the first one in, you will not have a working md array.


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