RAID solution handled by the operating system.

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4
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2answers
2k views

Major issues with fsck of 10TB ext3 RAID 6 (memory allocation failed, etc.)

I recently added a 7th 2TB drive to a linux md software RAID 6 setup. After md finished reshaping the array from 6 to 7 drives (from 8 to 10TB), I was still able to mount the file system without ...
4
votes
2answers
903 views

What happens to missed writes after a zpool clear?

I am trying to understand ZFS' behaviour under a specific condition, but the documentation is not very explicit about this so I'm left guessing. Suppose we have a zpool with redundancy. Take the ...
3
votes
1answer
274 views

Performance of Linux software raid-1 across SSD and HDD (partitions)

How does Linux software raid-1 work across disks of dissimilar performance. Would a raid-1 across ssd and hdd partitions give me a mirror of the ssd contents while not impacting the read speed? I ...
5
votes
1answer
627 views

100% packets dropped on first RX queue on 3/5 raid6 iSCSI NAS devices using intel igb (resolved)

Edit : The issue is resolved. The Queues in question have been used for Flow Control Packets. Why the igb driver propagated FC packets up to have them dropped (and counted) is another question. But ...
1
vote
1answer
138 views

RAID1: Can I do 'write-mostly' in hardware (LSI type cards) so Drive A: 100% READ and WRITE and Drive B: ONLY WRITE?

The Google hammer has failed me, so I turn to this august body for help :-) I'm interested in doing SSD/HDD RAID1 pairs using the principle of 'write-mostly' as available in Linux's software RAID ...
1
vote
1answer
819 views

Attempt recovery of MDADM RAID, on images created with dd

I have a software RAID5 array with 4 + 1 disks in which 2 of the disks have failed. I'm hoping that with some percussive maintenance, I might get one of the failed disks working again long enough to ...
2
votes
2answers
1k views

How to get notified of mdadm RAID problems?

I am running Ubuntu 12.04 LTS. Yesterday I found a message in my mailbox saying that my server was shut down. I proceeded to reboot the system, but it didn't come up after many minutes, and I didn't ...
1
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1answer
385 views

How do I rebuild my software RAID1 array after a drive replacement?

So I have 1and1 dedicated host with RAID 1 setup. One of the drive went bad, and they had just replaced it with a good one. Now I need to the build, but I'm not sure which drive is the old one, and ...
8
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1answer
4k views

Implementing Linux fstrim on SSD with software md-raid

I'm currently building a new Ubuntu 13.04 server with 2 256GB SSDs in a raid mirror to run a MariaDB instance. We typically place LVM on top of dm-crypt encryption on top of an md raid 1 array, but ...
0
votes
2answers
1k views

How to mount parition in from a working driver in RAID1

One of hard drives in array is dead, I'm unsure if it's raid0 or raid1, what I'm trying to achieve is mount the working drive and make a backup of what's left. If I mount /dev/md127 then I can see ...
1
vote
2answers
645 views

Grub can't find Xen multiboot file

I am running Debian Wheezy on a software RAID 0 with LVM. I'm trying to get Xen to work but grub refuses to boot in it. I installed Xen by following the instructions here: http://wiki.debian.org/Xen ...
-1
votes
1answer
144 views

Email disappeared on qmail server

I'm beginning to be desperate regarding a mail that seems to have completely disappeared on my Ubuntu Linux 10.04 LTS 64 bit server running qmail+vpopmail. Every domain has a .qmail-default containing ...
1
vote
2answers
1k views

Why is raid-check using so little io bandwidth?

Just out of curiosity, we have a RHEL server running software RAID. There's a cronjob which kicks off a raid data check every so often to check the consistency of the array. From my understanding, the ...
5
votes
1answer
414 views

Linux mdadm --grow RAID6: Something wrong - reshape aborted

I have a RAID60 that I want to expand. The current is: 2 axles each having 9 disks + 2 spares. The future is: 4 axles each having 10 disks + 1 spare. So I need to do some --grow to reshape the ...
0
votes
1answer
412 views

/usr/sbin/grub-probe: error: cannot find a GRUB drive for /dev/sdam1

When upgrading the kernel I get: /usr/sbin/grub-probe: error: cannot find a GRUB drive for /dev/sdam1. Check your device.map. Auto-detection of a filesystem of /dev/sdam1 failed. Please report this ...
1
vote
1answer
181 views

it is good and safe to use debian software raid?

My questions is as simple as the title: it is good and safe to use debian6 software raid? How safe it is? Can i have a software RAID configuration backup? How can i deal/recover with/from a HDD ...
0
votes
2answers
9k views

How to check RAID level on linux (dmraid)

I already know the RAID is a software RAID made with dmraid (or I assume so based on the fact that df-h shows /dev/mapper/VolGroup..., also /dev/md0 is inactive). I've run dmraid -r and get: ...
1
vote
1answer
289 views

ZFS about 7.2% disk space is lost

I know that ZFS reserves 1.6% disk space for copy-on-write. However, I am losing more than that. I have a ubuntu server with native ubuntu-zfs installed. The server has 45 drives, each 3TB. I am ...
2
votes
1answer
1k views

Remove “faulty state” in RAID 1

I wonder if there is any possibility to remove the state "faulty" in a RAID 1 if (for example) someone failed the wrong hard disk. I already searched for answers with Google and found several ...
5
votes
2answers
705 views

mdadm: Which disk is being rebuilt?

I noticed my software RAID1 degraded, and wanted to figure out which of the two disks in the array is being rebuilt/re-synced since they both show as being up. I am hoping someone can shed some light ...
0
votes
1answer
941 views

mdadm - raid device name changed on reboot

I'm not sure why, but after I restarted my ec2 instance, /dev/md0 didn't start as it normally would. after I saw what's available in /dev/md*, instead of seeing /dev/md0, there is a device there named ...
1
vote
1answer
3k views

VMware ESXi 5.1 can be installed RAID1 Software?

I am close to get a dedicated server in some data center and in the shopping cart there is no option to RAID1 Hardware only RAID1 by Software, since they will install ESXi it's possible that ESXi can ...
1
vote
1answer
114 views

Does Ubuntu 12.04 LTS support booting from RAID 6?

I'm setting up a new Ubuntu server using 12.04.2 LTS. I have five drives that I am setting up in a RAID 6 with LVM. Can I use this for bootup? Or should I make a separate RAID 1 partition for bootup ...
0
votes
1answer
218 views

Mirror two software RAID volumes

I have two software RAID volumes of differing speed and reliability on Ubuntu 12.10. I want to mirror the contents of the faster, but less reliable /dev/md0 to /dev/md1. My plan was to build a ...
1
vote
1answer
237 views

HDD compatibility to rebuild for RAID

Last year we build a RAID 1 with Western Digital 2 TB drive model number WD20EARS. Unfortunately one of the drives failed. We are unable to find any new drives of the same model number. What do we do? ...
0
votes
2answers
216 views

Setting up RAID 5 on Windows Server 2008 plus a bare metal restore

So here's my situation. I have three 1TB disks that I want to set up as RAID 5. One of these three disks has all my data on it and the other two are uninitialized. I have a hot swap disk that has ...
-1
votes
1answer
504 views

Raid 0+1 vs raid 1 and disk span in windows server 2012 [duplicate]

What is the difference between hardware raid 0+1 and 2 or more RAID 0 with disk span? what are the differences: advantages and disadvantages?
0
votes
1answer
79 views

Need to rebuild array from EBS volumes on AWS

I shutdown a bunch of instances on our AWS account as we're no longer developing for a product. After shutting down everything, before hitting the delete button on the EBS volumes, we decided we would ...
1
vote
2answers
1k views

Is 5MB/s a reasonable speed for Dell Software Raid Controller in Raid5

I have a new PowerEdge T320. Details are: Intel Xeon E5-1410 @ 2.8 GHz 16GB Windows Server 2008 r2 configured as Domain Controller Dell PERC S110 Software Raid 4x 7200 rpm 1TB drives configured in ...
2
votes
1answer
477 views

df showing wrong disk usage - disk corrupted

I'm getting a rather odd result from df from one of my disks using mdadm. It's setup as 4 of 2TB disks in raid 10. # df Filesystem Size Used Avail Use% Mounted on /dev/md2 ...
6
votes
1answer
4k views

High server load - [jbd2/md1-8] using 99.99% IO

I've been having spike in load over the last week. This usually occurs once or twice a day. I've managed to identify from iotop that [jbd2/md1-8] is using 99.99 % IO. During the high load times there ...
0
votes
1answer
1k views

Fedora. Properly configure RAID1. Raid has name /md127

I have RAID1 with 2 3TB disks. The general problem as I see is that for some reason this array have some problems with naming. It has md/19 md/19_0 and md127 My goal is to make this 3TB Raid1 ...
0
votes
1answer
237 views

Will Windows Server 2008 R2 software RAID volume with “Failed Redundancy” be available during resynching?

In addition to this question: Windows Server software RAID volume constant "Failed Redundancy" I have this problem on my production server too, but im concerned about resynching. If I ...
1
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0answers
92 views

Fresh debian squeeze software raid install wont boot

I am following these instructions: http://www.iprobot.net/linux-tutorial/how-to-setup-software-raid-in-debian-ubuntu/ (I used debian-live-6.0.6-amd64-gnome-desktop.iso and DD'd that onto a usb key, ...
0
votes
1answer
329 views

Migrating data from software raid mirror to ZFS mirror

With a setup with two disk is there a way to migrate from software RAID1 to ZFS mirror ? This kind of procedure would be inspired by the migration that is possible from a disk stored on a single ...
3
votes
1answer
2k views

Linux file system cache: Move data from Dirty to Writeback

My software RAID can write 800 MB/s sustained. I see that happening when cat /proc/meminfo |grep Writeback: returns > 2 GB. However, most of the time the writeback is round 0.5 GB which gives a ...
2
votes
1answer
168 views

Linux: md Software RAID array out of sync

We had a CentOS server report this software RAID issue via /etc/cron.weekly/99-raid-check WARNING: mismatch_cnt is not 0 on /dev/md2
1
vote
1answer
485 views

Failing disks in RAID array - strategy suggestions required

I have a linux based software RAID 5 array. SMART has just started to send me emails complaining that one of the 5 disks has a Current Pending Sector Count of 9 and also an Offline Uncorrectable Count ...
0
votes
1answer
136 views

Add generic rescue kernel on Gentoo

I have a Gentoo machine (64-bit) with software RAID on boot which was set up previously by someone who optimised the kernel for that machine. Now I want to shift the disks to a new machine (also ...
1
vote
1answer
295 views

Linux software RAID 10 array, failed drive, resize file system and migrate to a 3 drive RAID 1?

I have a software RAID 10 array which I recently noticed went into a degraded state. The OS is CentOS 5.8. It has 4x 500GB drives in 3 different arrays: /dev/md0 is RAID 1 and mounted to /boot (200MB ...
0
votes
1answer
647 views

Device in software RAID 10 array: clean, degraded. Ouch?

I've got 4x 500GB drives in software RAID. /dev/md0 is RAID 1 and mounted to /boot /dev/md1 is RAID 10 and is swap /dev/md2 is RAID 10 and is the main system and data device I looked at mdadm this ...
1
vote
1answer
246 views

What would happen if the underlying OS running software RAID crashed?

For example, if I had either a Linux server running mdadm or Windows OS performing RAID at the software level, would data recovery be possible if the system crashed? Are there tools to access the ...
3
votes
1answer
692 views

How do I preseed a simple RAID5 setup on Ubuntu Server? [closed]

I have three 2TB drives in the machine; I want a RAID5 of ~4TB capacity, and 100GB or so of swap space. No LVM, no encryption, no fanciness. This is easy to do using the interactive installer, but I'm ...
0
votes
1answer
262 views

Linux RAID10 hit bad disk while re-syncing. Is it hosed?

I have a Linux software RAID10 device on md0. It's made up of 4 1TB disks sd[abcd]. Yesterday Smart emailed me to say a disk was going bad (seek errors going up and reallocated sectors). I rebooted ...
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0answers
165 views

mdadm drive UUIDs chanaged, can they be changed back?

So I ran into this trouble and I believe I lost all my data..However I found an old mdadm --examine --scan file I made a month ago and an old mdadm.conf....Is it possible to use these two items to fix ...
1
vote
2answers
8k views

mdadm rebooted, array missing? can't assemble?

Not sure what is going on with my Array. I rebooted ubuntu 12.04.1 and got a error on startup that fstab couldn't mount the filesystem UUID I have for my mdadm array. After running a few commands a I ...
-1
votes
2answers
154 views

How do RAID 0 Offers improved i/0? [duplicate]

Possible Duplicate: What are the different widely used RAID levels and when should I consider them? I wonder how RAID 0 offers better i/o. If i am not wrong in RAID 0 data gets split and ...
0
votes
2answers
545 views

Mid-2011 Mac Mini Server keeps dropping a disk from RAID, not sure what to do about it

The small business that I do sysadmin work for on the side uses a mid-2011 Mac Mini Server (running 10.7 Lion) as a fileserver and FileMaker database host. Its 2 750gb HDDs are RAID 1'd together, and ...
1
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1answer
69 views

Adding Raid 1 to Raid 0 on Linux

I have a system already configured with raid 1 with 2 disks: /dev/md1 918347072 249416692 621528596 29% /var /dev/md0 9920532 160640 9247828 2% /tmp # cat ...
5
votes
1answer
2k views

High I/O latency with software RAID, LUKS encrypted and LVM partitioned KVM setup

I found out a performance problems with a Mumble server, which I described in a previous question are caused by an I/O latency problem of unknown origin. As I have no idea what is causing this and how ...