All Questions
122
questions
0
votes
1
answer
155
views
How do I prevent anacron from running certain scripts?
I am running RHEL5 and software RAID (mdadm). Currently I allow the 99-raid-check weekly cron script to run at the normal time (early Sunday morning). However, if the system is off during that time it ...
- 3
2
votes
1
answer
6k
views
Assembling an mdadm array with "possibly out of date" disks
I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4.
It seems that at some point two (of ...
- 21
1
vote
2
answers
990
views
/dev partition missing, so mdadm broken. How to get Linux to see partition?
Upgraded a Linux box and changed out the root drives. There was a RAID-5 array of three SATA drives that I moved over (not root). Reinstalled the OS but was CentOS 6.4 before and after.
# mdadm --...
- 258
1
vote
0
answers
715
views
Create a mdadm raid mirror of an existing lvm
Hello I'm trying to figure out how I can create a pretty strange mdadm mirror of my lvm.
I have 4 disks, (sda,b,c,d).
Each disk has 2 partitions:
1Gb - physical volume
500mb - Swap
My system lvm ...
- 197
9
votes
1
answer
2k
views
Is it safe to "use" to disk if extended smart check is in progress?
As simple as the title suggests.
/dev/sda is a unit from /dev/md127 - RAID1 drive.
I'm currently running a test - started a smartctl -t long /dev/sda.
Afterwards, I started to copy files over ...
- 759
3
votes
1
answer
2k
views
Documentation for mdadm bad block support
I've read a bit about that mdadm (and the kernel) now have bad block support but I am having a hard time finding any useful documentation on this subject.
Is the bad block list for disk X duplicated ...
- 1,260
0
votes
2
answers
216
views
Writing to a specific drive with software RAID4 on Linux
Edited to reflect conclusions from comments:
I want to construct a software RAID-like array with 2 storage devices plus one parity device, where the parity device maintains the XOR of the two other ...
- 125
1
vote
1
answer
8k
views
mdadm disk partition type : Linux RAID Autodetect mandatory or 83 Linux ok?
Main question : Q1:
i would like to know when using mdadm, the "Linux RAID Autodetect" type is mandatory for my disk, or a "83 linux" type is ok ?
Sub question : Q1_1 :
What are the differences ?
...
fredk
13
votes
5
answers
12k
views
Need to find which drives are mirrored within RAID-10 array
I have a home media server running on openSUSE 12.2. I'm using eight 2TB drives in a RAID-10 configuration. I deliberately bought two different types of drives: four Seagate Barracuda Green and four ...
CapnBFG
2
votes
1
answer
4k
views
Mounting a raid1 device - no suitable drives found
I'm having some problems with my disks; long story.. but right now I'm trying to mount a device that was part of a 2-disk raid1. For that, I tried to assemble it into a new array, but...
% mdadm -Av /...
- 121
4
votes
2
answers
6k
views
In mdadm's /proc/mdstat, what does [U_U] mean?
I just set up a raid 5 array for my media server. I set got 2 new disks, and set up an array with one missing drive, to copy the data from the old single drive to the new array, and later I will add ...
- 2,226
2
votes
1
answer
2k
views
Linux raid10 on btrfs
I've read that BTRFS requires at least 4 disks (https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices).
Indeed, Linux mdadm raid10 requires only 2 disks (http://en.wikipedia.org/...
- 21
0
votes
1
answer
1k
views
Linux system cannot find RAID 10 md device after reboot of the system
I ran these commands:
$ sudo mdadm --verbose --create /dev/md0 --level=10 --chunk=256 --raid-devices=4 /dev/sdh1 /dev/sdh2 /dev/sdh3 /dev/sdh4
$ echo 'DEVICE /dev/sdh1 /dev/sdh2 /dev/sdh3 /dev/sdh4' |...
- 141
0
votes
1
answer
164
views
How to create physical and logical volumes on system reboot
My system is set up so that I take four devices, create a RAID 10 array out of them, create a physical volume, a volume group, and then three logical volumes, and lastly I create filesystems out of ...
- 141
5
votes
2
answers
4k
views
Does TRIM avoid the performance impact of mdadm RAID 1 on SSD?
It has already been mentioned in other questions that Red Hat recommends against using mdadm RAID 1 on SSD.
Red Hat also warns that software RAID levels 1, 4, 5, and 6 are not recommended for use ...
- 353