Please answer the question asked by Peasant about did you run:
Quote:
Originally Posted by Peasant
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.
Regards
Peasant.
You are right.
I added it to md0 manually, thats not a problem. Problem is why my data from /mnt/raid is not accessible and i cant read it when i unplug one of the 2 devices?
Thats strange from me, i cant figure out.
I added a folder in array in which i have mounted /dev/md0.
so i have a folder
/mnt/raid/test
and inside test some files.
I cant access it and all is fine. When I unplug disk when machine is running(or not, its the same result), i cant read from that test folder.
Input output error gives me.
But when I unplug another disk, it is working just fine.
Thats what bothers me.
Idea behind all this is to have a shared folder and prevention of data loss. If that disk fails i cannot access to that files. Thats the problem
Last edited by tomislav91; 08-31-2018 at 10:12 AM..
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Discussion started by: anaigini45
2 Replies
LEARN ABOUT REDHAT
lsraid
LSRAID(8) Linus md Utilities LSRAID(8)NAME
lsraid - List and query Linux md devices.
SYNOPSIS
lsraid -A [-g|-s|-f] {-a <device> | -d <device>} ...
lsraid -A -p
lsraid -D [-l] {-a <device> | -d <device>} ...
lsraid -D -p
lsraid -R {-a <device> | -d <device>} ...
lsraid -R -p
lsraid -h
lsraid -V
DESCRIPTION
lsraid is a program for querying Linux md devices. It can describe the composite device and the block devices that belong to it. It can
also provide a description of the md device suitable for including in the /etc/raidtab configuration file.
lsraid also has the ability to operate on online and offline devices. It can read an online device via the kernel interface and provide
information about it. When a device is offline, lsraid can look at any of the block devices that are a part of the md device and read the
persistent md superblock for information.
OPTIONS -A Selects array-based operation. lsraid will query the given devices and output a short listing of the referenced md devices.
-a <device>
Adds md device <device> to the list of devices to query. If the device is online, lsraid will discover all of the block devices that
belong to it via the kernel interface. Otherwise lsraid will only be able to verify that the device exists.
-D Selects disk-based operation. lsraid will query the given devices and then output a description of all the member disks requested.
-d <device>
Adds block device <device> to the list of devices to query. lsraid will read the md superblock off of <device> and use it to discover
the assocated md device and block devices.
-f Displays only failed block devices in array-based mode (-A).
-g Displays only good block devices in array-based mode (-A).
-h, --help
Displays a short usage message, then exits.
-l Displays a long dump of block device superblocks in disk-based mode (-D). This output is verbatim from the on-disk md superblock, and
reflects the state on the specific disk, not the state the md device currently considers authorative.
-p Scans all block devices in /proc/partitions for RAID arrays. This can be slow in the presence of network block devices and the like.
This option is mutually exclusive with the -a and -d options.
-R Selects raidtab operation. lsraid will query all the devices specified and output a description of the referenced md devices in a for-
mat suitable for placing in a raidtab(5) file.
-s Displays only spare block devices in array-based mode (-A).
NOTES
lsraid cannot discover the block devices that make up an offline md device. Providing one of the member devices with the -d option allows
lsraid to discover the rest of the information about the offline md device.
Disk-based operation only displays the block devices specified on the command line. Specify the md device on the command line to see
information about all of the member disks. If the md device is offline, specify both the md device and one of the member disks.
lsraid does not do any special handling of md devices composed of other md devices (eg RAID 1+0). The member devices are merely treated as
block devices while in the context of the parent device. This is only an issue for raidtab-based operation. The raidtab(5) output will be
printed in the order the md devices are queried. This means that a command creating a raidtab(5) for a RAID 1+0 device should list the
member devices first on the command line.
EXAMPLES
lsraid -A -a /dev/md0
Display a short listing of the md0 device.
lsraid -A -d /dev/sda1
Display a short listing of the array that sda1 belongs to.
lsraid -A -f -a /dev/md0
Display the failed devices belonging to the md0 device.
lsraid -D -l -a /dev/md0
Display a long dump of the on-disk md superblock of every disk in md0.
lsraid -D -a /dev/md0 -d /dev/sda1
Display a short discription of the disks in md0 as well as a short description of the disk sda1. sda1 will only be described once if
it belongs to md0.
lsraid -R -a /dev/md0 -a /dev/md1 -a /dev/md2
Display a description of the arrays in an output format suitable for using in raidtab(5) files. Note that if md0 and md1 are raid0
arrays and md2 is a raid1 created from md0 and md1, this command will output the information in the correct order.
lsraid -R -p
Scan all block devices in /proc/partitions and display all discovered md devices in a format suitable for using in raidtab(5) files.
BUGS
Probably.
SEE ALSO mkraid(8), raidtab(5), raidstart(8), raidstop(8)VERSION
lsraid version 0.7.0 (26 March 2002)
HISTORY
Version 0.7.0
Added scanning of active block device partitions.
Version 0.4.0
Initial documented version. Functionally complete.
AUTHOR
Joel Becker <joel.becker@oracle.com>
COPYRIGHT
Copyright (C) Oracle Corporation, Joel Becker. All rights reserved.
This program is free software; see the file COPYING in the source distribution for the terms under which it can be redistributed and/or
modified.
3rd Berkeley Distribution 2002-03-26 LSRAID(8)