Please Help me with my 5Big Network 2

[macdalor]

Seems must be something like this (I am no raid expert, took this from the internet)

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mdadm --add /dev/md0 /dev/sda8
mdadm --grow --raid-devices=5 /dev/md0

doesn't seem to work either

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root@Lacie5Big:/ # umount /dev/md0
root@Lacie5Big:/ # mdadm --add /dev/md0 /dev/sda8
mdadm: Cannot open /dev/sda8: Device or resource busy
root@Lacie5Big:/ #

[Jocko]

maybe sda8 is still mounted

[fvdw]

maybe sda8 is still mounted

Think you are right Jocko, this message displayed, device busy, is typical when you try to do something which needs an umounted device.

[Jocko]

And maybe other things.

As you had restarted the NAS, do you kill again the processes like written on the howto?

To be able to manage the raid with sda8 and md0, you need to unmount them and stop some processes like noflushd...

[macdalor]

tried a few things without results...

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root@Lacie5Big:/ # killall noflushd
root@Lacie5Big:/ # killall smbd
root@Lacie5Big:/ # umount /dev/md0
root@Lacie5Big:/ # mdadm --add /dev/md0 /dev/sda8
mdadm: Cannot open /dev/sda8: Device or resource busy
root@Lacie5Big:/ # mdadm -stop /dev/md0
mdadm: -s does not set the mode, and so cannot be the first option.
root@Lacie5Big:/ # killall noflushd
killall: noflushd: no process killed
root@Lacie5Big:/ # killall smbd
killall: smbd: no process killed
root@Lacie5Big:/ # Umount /dev/md0
-sh: Umount: not found
root@Lacie5Big:/ # mdadm -stop /dev/md0
mdadm: -s does not set the mode, and so cannot be the first option.
root@Lacie5Big:/ # mdadm --add /dev/md0 /dev/sda8
mdadm: Cannot open /dev/sda8: Device or resource busy


sda8 seems to always be busy...how can I kill this?

for info on RAID:

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root@Lacie5Big:/ # sudo mdadm --detail /dev/md0
/dev/md0:
        Version : 01.00.03
  Creation Time : Sat Sep 17 10:25:30 2016
     Raid Level : raid0
     Array Size : 3893898752 (3713.51 GiB 3987.35 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sat Sep 17 10:25:30 2016
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 64K

           Name : 0
           UUID : 5668ffdd:e6ca22a8:84c3917d:a7a8e08e
         Events : 0

    Number   Major   Minor   RaidDevice State
       0       8       24        0      active sync   /dev/sdb8
       1       8        8        1      active sync   /dev/sdc8
       2       8       72        2      active sync   /dev/sdd8
       3       8       56        3      active sync   /dev/sde8

[Jocko]

There are several errors.

First do you unmount sda8 (unmount md0 is not enough).

So before managing the raid check if both are really unmounted with the output of

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mount

In the howto there is a typo errors in the stop command line : a '-' is missing but you do not have to stop the raid to add a device !

So after killing all required processes and unmounting md0 and sda8, do :

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mdadm --add /dev/md0 /dev/sda8
mdadm --grow --raid-devices=5 /dev/md0
e2fsck -f /dev/md0
resize2fs /dev/md0
cat /etc/mdadm.0 > /etc/mdadm.conf
mdadm --detail --scan >> /etc/mdadm.conf


[macdalor]

still giving me an error

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root@Lacie5Big:/ # umount /dev/sda8
root@Lacie5Big:/ # mdadm --add /dev/md0 /dev/sda8
mdadm: add new device failed for /dev/sda8 as 4: Invalid argument

[Jocko]

Maybe the easy way is to rebuild fully your raid (if you do not have data on it)

So stop it

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mdadm --stop /dev/md0

erase all zero-superblock on sd[abcde]8

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mdadm --zero-superblock /dev/sda8
mdadm --zero-superblock /dev/sdb8
mdadm --zero-superblock /dev/sdc8
mdadm --zero-superblock /dev/sdd8
mdadm --zero-superblock /dev/sde8

create again the raid

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mdadm --create /dev/md0 --level=0 --raid-devices=5 /dev/sda8 /dev/sdb8 /dev/sdc8 /dev/sdd8 /dev/sde8

check if the raid has been created

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cat /proc/mdstat

save new conf

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cat /etc/mdadm.0 > /etc/mdadm.conf
mdadm --detail --scan >> /etc/mdadm.conf

format the raid partition

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mke2fs -t ext3 -j -m 1 /dev/md0

So if all is Ok reboot the NAS

[macdalor]

perfect! :applause I should have done that from the beginning instead of wasting your time guys...

It's showing 4641.89 GB for each disk but this must be a bug as the allocated space in the RAID is fine (4.89Tb)

Screen Shot 2016-09-18 at 19.31.37.png

Thank you so much once again guys!
:hail

[Jocko]

:thumbup

About size, there is no bug,53TB the data partition (sdx8) size is around 0.906TB so a raid0 size 4.53Tb is right