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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
Old 11-27-2018
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?
 

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PARTX(8)						      System Manager's Manual							  PARTX(8)

NAME
partx - tell the Linux kernel about the presence and numbering of on-disk partitions SYNOPSIS
partx [-a|-d|-s] [-t TYPE] [-n M:N] [-] disk partx [-a|-d|-s] [-t TYPE] partition [disk] DESCRIPTION
Given a device or disk-image, partx tries to parse the partition table and list its contents. It optionally adds or removes partitions. The disk argument is optional when a partition argument is provided. To force scanning a partition as if it were a whole disk (for example to list nested subpartitions), use the argument "-". For example: partx --show - /dev/sda3 This will see sda3 as a whole-disk rather than a partition. This is not an fdisk program -- adding and removing partitions does not change the disk, it just tells the kernel about the presence and numbering of on-disk partitions. OPTIONS
-a, --add Add the specified partitions, or read the disk and add all partitions. -b, --bytes Print the SIZE column in bytes rather than in human-readable format. -d, --delete Delete the specified partitions or all partitions. -g, --noheadings Do not print a header line. -l, --list List the partitions. Note that all numbers are in 512-byte sectors. This output format is DEPRECATED in favour of --show. Don't use it in newly written scripts. -o, --output list Define the output columns to use for --show and --raw output. If no output arrangement is specified, then a default set is used. Use --help to get list of all supported columns. -r, --raw Use the raw output format. -s, --show List the partitions. All numbers (except SIZE) are in 512-byte sectors. The output columns can be rearranged with the --output option. -t, --type type Specify the partition table type -- aix, bsd, dos, gpt, mac, minix, sgi, solaris_x86, sun, ultrix or unixware. -n, --nr M:N Specify the range of partitions. For backward compatibility also the format <M-N> is supported. The range may contain negative numbers, for example "--nr :-1" means the last partition, and "--nr -2:-1" means the last two partitions. Supported range specifi- cations are: <M> Specifies just one partition (e.g. --nr 3). <M:> Specifies lower limit only (e.g. --nr 2:). <:N> Specifies upper limit only (e.g. --nr :4). <M:N> or <M-N> Specifies lower and upper limits (e.g. --nr 2:4). EXAMPLES
partx --show /dev/sdb3 partx --show --nr 3 /dev/sdb partx --show /dev/sdb3 /dev/sdb All three commands list partition 3 of /dev/sdb. partx --show - /dev/sdb3 Lists all subpartitions on /dev/sdb3 (the device is used as whole-disk). partx -o START -g --nr 3 /dev/sdb Prints the start sector of partition 5 on /dev/sda without header. partx -o SECTORS,SIZE /dev/sda5 /dev/sda Lists the length in sectors and human-readable size of partition 5 on /dev/sda. partx --add --nr 3:5 /dev/sdd Adds all available partitions from 3 to 5 (inclusive) on /dev/sdd. partx -d --nr :-1 /dev/sdd Removes the last partition on /dev/sdd. SEE ALSO
addpart(8), delpart(8), fdisk(8), parted(8), partprobe(8) AUTHORS
Davidlohr Bueso <dave@gnu.org> Karel Zak <kzak@redhat.com> The original version was written by Andries E. Brouwer <aeb@cwi.nl>. AVAILABILITY
The partx command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. 1 Feb 2011 PARTX(8)
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