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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LEARN ABOUT V7
rp
RP(4) Kernel Interfaces Manual RP(4)NAME
rp - RP-11/RP03 moving-head disk
DESCRIPTION
The files rp0 ... rp7 refer to sections of RP disk drive 0. The files rp8 ... rp15 refer to drive 1 etc. This allows a large disk to be
broken up into more manageable pieces.
The origin and size of the pseudo-disks on each drive are as follows:
disk start length
0 0 81000
1 0 5000
2 5000 2000
3 7000 74000
4-7 unassigned
Thus rp0 covers the whole drive, while rp1, rp2, rp3 can serve usefully as a root, swap, and mounted user file system respectively.
The rp files access the disk via the system's normal buffering mechanism and may be read and written without regard to physical disk
records. There is also a `raw' interface which provides for direct transmission between the disk and the user's read or write buffer. A
single read or write call results in exactly one I/O operation and therefore raw I/O is considerably more efficient when many words are
transmitted. The names of the raw RP files begin with rrp and end with a number which selects the same disk section as the corresponding
rp file.
In raw I/O the buffer must begin on a word boundary.
FILES
/dev/rp?, /dev/rrp?
SEE ALSO hp(4)BUGS
In raw I/O read and write(2) truncate file offsets to 512-byte block boundaries, and write scribbles on the tail of incomplete blocks.
Thus, in programs that are likely to access raw devices, read, write and lseek(2) should always deal in 512-byte multiples.
RP(4)