Revive RAID 0 Array From Buffalo Duo NAS Post: 303026438

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Top Forums UNIX for Advanced & Expert Users Revive RAID 0 Array From Buffalo Duo NAS Post 303026438 by metallica1973 on Tuesday 27th of November 2018 08:15:18 PM

11-27-2018

Registered User

I changed machines to a raspberry pi. Could it be that when I assembled the array, I did it as raid 0 when it needed to be raid 1? The reason I ask this is because I see this from lsblk as in:

Code:

sudo lsblk 
NAME        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
sda           8:0    0 931.5G  0 disk  
├─sda1        8:1    0   977M  0 part  
│ └─md126     9:126  0   977M  0 raid1 
├─sda2        8:2    0   4.8G  0 part  
│ └─md125     9:125  0   4.8G  0 raid1 
├─sda3        8:3    0     1M  0 part  
├─sda4        8:4    0     1M  0 part  
├─sda5        8:5    0   977M  0 part  
│ └─md124     9:124  0   977M  0 raid1 
└─sda6        8:6    0 917.2G  0 part  
  └─md127     9:127  0   1.8T  0 raid0 
sdb           8:16   0 931.5G  0 disk  
├─sdb1        8:17   0   977M  0 part  
│ └─md126     9:126  0   977M  0 raid1 
├─sdb2        8:18   0   4.8G  0 part  
│ └─md125     9:125  0   4.8G  0 raid1 
├─sdb3        8:19   0     1M  0 part  
├─sdb4        8:20   0     1M  0 part  
├─sdb5        8:21   0   977M  0 part  
│ └─md124     9:124  0   977M  0 raid1 
└─sdb6        8:22   0 917.2G  0 part  
  └─md127     9:127  0   1.8T  0 raid0 
mmcblk0     179:0    0   1.9G  0 disk  
├─mmcblk0p1 179:1    0  43.2M  0 part  /boot
└─mmcblk0p2 179:2    0   1.8G  0 part  /

? Should i have been:

Code:

sudo mdadm --create /dev/md127 --assume-clean --level=1 --verbose --chunk=64 --raid-devices=2 --metadata=0.90 /dev/sda6 /dev/sdb6

If I resamble it as a raid 1, will it destroy the data?

metallica1973

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mkfs.btrfs

MKFS.BTRFS(8)						      System Manager's Manual						     MKFS.BTRFS(8)

NAME

       mkfs.btrfs - create an btrfs filesystem

SYNOPSIS

       mkfs.btrfs [ -A alloc-start ] [ -b byte-count ] [  -d data-profile ] [  -l leafsize ] [	-L label ] [  -m metadata profile ] [  -n nodesize
       ] [  -s sectorsize ] [  -h ] [  -V ]  device [  device ... ]

DESCRIPTION

       mkfs.btrfs is used to create an btrfs filesystem (usually in a disk partition, or an array of disk partitions).	device is the special file
       corresponding  to  the  device  (e.g  /dev/sdXX	).   If  multiple   devices  are specified, btrfs is created spanning across the specified
       devices.

OPTIONS

       -A, --alloc-start offset
	      Specify the offset from the start of the device to start the btrfs filesystem. The default value	is  zero,  or  the  start  of  the
	      device.

       -b, --byte-count size
	      Specify the size of the resultant filesystem. If this option is not used, mkfs.btrfs uses all the available storage for the filesys-
	      tem.

       -d, --data type
	      Specify how the data must be spanned across the devices specified. Valid values are raid0, raid1, raid10 or single.

       -l, --leafsize size
	      Specify the leaf size, the least data item in which btrfs stores data. The default value is the page size.

       -L, --label name
	      Specify a label for the filesystem.

       -m, --metadata profile
	      Specify how metadata must be spanned across the devices specified. Valid values are raid0, raid1, raid10 or single.

       -n, --nodesize size
	      Specify the nodesize. By default the value is set to the pagesize.

       -s, --sectorsize size
	      Specify the sectorsize, the minimum block allocation.

       -V, --version
	      Print the mkfs.btrfs version and exit.

AVAILABILITY

       mkfs.btrfs is part of btrfs-progs. Btrfs is currently under heavy development, and not suitable for any uses other  than  benchmarking  and
       review.	Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.

SEE ALSO

       btrfsck(8)

																     MKFS.BTRFS(8)