0
votes
1answer
201 views

Understanding /proc/mdstat [U_] VS [_U]

My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 ...
0
votes
1answer
635 views

How do I recover data from only a single drive in RAID 1 setup on Synology DS214+ NAS?

I'm doing this so I know how to recover my data in case the NAS itself dies out and I'm only left with just a single drive from the 2nd bay (or from the 1st bay). Setup Synology DS214+ NAS 2x 4TB ...
1
vote
2answers
56 views

What are the risks of running a software RAID 1 array in degraded mode?

I'm replacing my workstation's system drive and would like to in the future be able to easily add a second drive to form a proper (although software) RAID 1 mirror. For the time being, however, I'm ...
1
vote
0answers
108 views

Is `dmsetup remove` safe with respect to contained data?

I have a "lost" SW RAID array as described in this question: http://askubuntu.com/questions/311024/raid1-array-lost-after-upgrade-from-ubuntu-11-10-to-13-04. I have now identified a way to mount one ...
1
vote
0answers
169 views

Upon reboot, Linux software raid fails to include one device of a RAID1 array

One of my four Linux software raid arrays drops one of its two devices when I reboot my system. The other three arrays work fine. I am running RAID1 on kernel version 2.6.32-5-amd64 (Debian Squeeze). ...
0
votes
1answer
252 views

Adjusting mdadm priority on Ubuntu

I have Ubuntu 12.04 running on my new server, and it is setup to run off of one drive, then 2 drives that are mirrored using mdadm. When streaming files or media from it, it is extremely slow. I was ...
2
votes
0answers
383 views

Cloning Ubuntu mdadm RAID1

I would like to clone a pair of RAID1 drives created with mdadm. I've tried Clonezilla, but there's no native support for mdadm, so it resorts to using dd which is incredibly slow. I've looked for ...
1
vote
0answers
54 views

Software RAID 1 resync's on SATA cable switch?

I made a mistake when I opened up my desktop removed a 2 disk RAID 1 and reconnected them, but with the SATA cables switched, such that sda became sdb and viceversa. On boot, the RAID array started ...
1
vote
1answer
570 views

SSD lifetime in software RAID 1 [closed]

We're looking at use two SSD in a software RAID 1 raid on CentOS. We have tested performances and it is the same as a SSD alone. But we fear that because of mdadm, lifetime of the SSD will shorten. ...
1
vote
0answers
98 views

How to add new partition to RAID-1 array on Redhat FC10?

I have a RH FC10 system with RAID 1 partitions, here is mdadm.conf: # mdadm.conf written out by anaconda DEVICE partitions MAILADDR root ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 ...
16
votes
7answers
18k views

Simple mdadm RAID 1 not activating spare

I had created two 2TB HDD partitions (/dev/sdb1 and /dev/sdc1) in a RAID 1 array called /dev/md0 using mdadm on Ubuntu 12.04 LTS Precise Pangolin. The command sudo mdadm --detail /dev/md0 used to ...
1
vote
0answers
832 views

mdadm: hot remove failed

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
0
votes
1answer
123 views

How to identify raid1 disks

I would like to know how mdadm identifies physical disks of raid1 . I think it is managed by uuids not device file like /dev/sdc2 /dev/sdd2. But I can`t confirm such information of raid1.
4
votes
4answers
5k views

Does RAID1 increase performance with Linux mdadm?

I have a cheap 2-bay NAS with a 2TB HDD. To be robust against disk failure, I'm thinking of buying a second 2TB HDD and putting it in RAID1 with Linux mdadm. The file system is ext4. Will this ...
4
votes
2answers
2k views

How does one enable --write-mostly with Linux RAID?

Unfortunately the mdadm and mdadm.conf man pages are not quite up to par. I would like to enable the --write-mostly flag for my RAID, but neither the man pages nor the internet will tell me how. I am ...
1
vote
4answers
3k views

How do I mount a software RAID1 (mirror) created by windows in Linux using mdadm?

I'm switching my Windows server to Ubuntu and am trying to get my software RAID1 (mirror) that I created in Windows to show up in Ubuntu. I have read that this is possible here using mdadm, but I'm ...
1
vote
1answer
635 views

CentOS - mdadm raid1 drive won't mount to default location

I'm running CentOS 5.5, the system, boot, swap, etc. is all on /dev/sda and I have two identical single-partition drives /dev/sdb1 /dev/sdc1 that are configured in RAID1 (using mdadm). It was working ...
0
votes
1answer
858 views

mdadm raid-1 after restarting usb devices not accessible anymore

Is my mdadm software raid in danger of data loss??? My both two new built raid-1 on external usb disks behave strangely. Both were fine and rebuilt and cat /proc/mdstat showed Every 10,0s: cat ...
2
votes
3answers
990 views

RAID-1 and regular drive removal (using RAID-1 as a backup measure)

Is using mdadm's RAID-1 of 2 partitions (one on laptop's internal HDD, one on external HDD) a good idea. I want the system to work as RAID-1 if both drives are present, work as regular volume ...