Questions tagged [software-raid]

RAID solution handled by the operating system.

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High avgqu-sz & utilisation on madadm RAID 0 in AWS EC2 I3.8x large instance

I have an AWS EC2 i3.8xlarge with 4x1.9TB ephemeral storage volumes tied in mdadm RAID-0 (Yes, RAID 0) with XFS file system mounted using noatime and inode64 options. I am running an IO intensive ...
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I accidently deleted the partition tables of my RAID6 drives

I accidentally deleted the partition table of 2 drives in my 4 drive RAID6 by reversing the order of sudo sgdisk -R=/dev/sdb /dev/sdz parted /dev/sdb print currently reports: Model: ATA ST2000DM008-...
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desperate attempt to head off RAID 0 failure, can i copy a disk with dd?

A colleague has been using a 10TB RAID 0 array to edit a film. He suddenly realized it's 98% full. The array has started seriously acting up, but cooperates grudgingly if you shut down all processes ...
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How is RAID3/4 is implemented for more than 4 drives?

I understand that, RAID 3/4 for 4 drives is: Parity Drive = D1 XOR D2 XOR D3. But what is there 5 drives or more? For example 5 or 6. How many parity drives is needed, and how XOR algorithm is working ...
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BTRFS and coping with disk failure

I'm finding the information for this quite difficult to come by, but it seems like an important feature of a RAID system: what happens immediately after a disk fails for BTRFS? For my hardware RAID ...
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What is the safest RAID Type for maintain the system?

What is safest RAID Configuration to maintain the system without data loss? If you have 6 X 8TB Disk On RAID 10 it has 24TB usage spaces and 1 disk failure reserve and on RAID 6 it has 2 Disk failure ...
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1answer
64 views

How can I know if one disk faults on RAID 5?

I have 4 x 8TB configured on RAID 5, as it is if one disk faults the system can survive. But if more than 1 disk faults, the system will be destructed. How can I check if one disk is already faulted ...
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46 views

Raid 5 is brocken after replace a disk

My server mailed me that one of my disks failed to read a block. So I decide to replace it before it failed completely. I added a new disk and replace the failing one. sudo mdadm --manage /dev/md0 --...
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39 views

Cache writes on a RAID to SSD and only do one daily commit to HDD

I have a Debian 10.7 server at home with 3x8TB disks in a mdraid5 setup, kept with hd-idle at a 600s spindown time to reduce power usage. The only thing using the disks is a Samba server, which serves ...
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1answer
81 views

Moving raid array from USB to SATA

I have a raid 1 array of two 2TB drives which I set up a while ago, both of them were connected through a sata->usb adapter (external HDD cases). Now I moved them into a proper PC but mdadm does ...
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29 views

Converting a RAID 1 drive to a regular one and booting off of it

I'm using mdadm to manage a RAID 1 array with three disks. Would it be possible to take a single drive from the array (i.e. /dev/sdc), turning it into a regular drive, and then booting another PC off ...
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“root account locked” after removing one RAID1 hard disc

I tried this out in a VirtualMachine to hope I can learn somethign. Problem My Debian 10 does not boot anymore and tells me that I am in emergency mode and Cannot open access to console, the root ...
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50 views

Advantages of partitioning RAID HDs?

I have a bunch of identical, brand new HDs (4*3T, if it matters) I need to use for a single RAID5 array (Linux mdmadm). It is still undecided if I'll use the entire combined content for a single ...
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Rebuilding mdadm RAID-5 from existing disks (2/3)

I have a server running Ubuntu Server 16.04 LTS with 3 x 3TB drives in a RAID-5 setup. A few days ago my system jumped into recovery mode and it seemed to have something to do with the array. ...
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mdadm: power failure during raid1 rebuild

RAID1 array created with mdadm; array was rebuilding when there was a power failure. On coming back up, the array seems to be dead. # cat /proc/mdstat Personalities : [raid1] md0 : inactive sdb1[2](S) ...
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mdadm - Attempted to move raid array to new system, superblocks gone?

I attempted to move a mdadm raid 1 array to a different system this evening. I took the 2 SSDs out of one system and put them in another, then booted that system. I opened gparted to check what the ...
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RAID Configuration on Model Proliant DL380p Gen8

how do I see the RAID configuration on HP Proliant DL380p Gen8 without the need to restart the server?
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Is putting Server 2019 (full os with hyper-v) and 2 2019 Guests on a single two-disk Raid 1 array reliable enough?

We're currently experiencing some significant cpu/ram performance issues with 2 VM's on our current HPE 2015 tower server (2x Xeon 8c/8t 1.7ghz) running server 2012 for HV and guests (10 guests total),...
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mdadm RAID5 array recovery stops without SCSI errors

I have an md-based RAID5 array which has been working without issue for about 2 years. Yesterday I've had spontaneous disk and/or PHY resets on one disk (but not actual read errors). md marked the ...
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linux software raid in virtual environment case

I created a virtual machine VMware Workstation with two disks. Installed in it Centos 8 with software raid 1 using the Anaconda installer After turning off the virtual machine and removing one disk, ...
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32 views

Increase space by growing mdadm RAID10 from 4 to 6 (and more)

I'm running Centos 7.8 with mdadm v4.1 I have 4 NVMe (3.2TB each) configured in a RAID 10, so 50% usable space (6.4TB): Personalities : [raid10] md0 : active raid10 nvme5n1p16 nvme4n1p15 nvme0n1p1[4] ...
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145 views

mdadm RAID 10 filesystem corruption — recoverable?

PROBLEM: I had a degraded disk in my RAID 10 array which I created using mdadm. I first removed the disk, replaced it with a new one, but when I rebuilt, I got an error saying it couldn't detect the ...
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LVM: Stripe All Mirror Everything setup on home server

Idea: I currently have this home server, serving as SMB fileserver and providing a couple of network services. It contains one 2TB and two 3TB drives, simple mounted volumes. While it mostly stores ...
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856 views

Recommended approach for booting from Linux software RAID for redundancy

I am looking for the recommended approach to setting up software RAID (using mdadm) on Centos 8 to provide redundancy. In my setup I have 4 identical disks, but I assume the answer should also be ...
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mdadm fails to automount array with dependencies to other arrays and external bitmap

My setup is a bit atypical in order to reuse some old disks (I'm aware of the performance disadvantages but I don't want to throw away fine disks). It's a raid5 of two 6T disks, a raid0 of 2x3T disks ...
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27 views

Linux software raid slow until reboot

I am running an debian 10 machine with 3 4tb hdd drives. Each drive has a 1GB partition for a raid1 for the boot and the rest of the disk is configured as a raid 5 for lvm. After a while of running I ...
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1answer
35 views

Can we move RAID configured disks across different Servers

I have 2 SSD disks configured as RAID 1 using RAID feature in BIOS. By chance if my motherboard and processor is damaged, can I connect these 2 SSD disks to another Server. Will these SSD disks boot ...
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Rebooted Ubuntu, Raid6 degraded, Raid5 ok [closed]

Boot Drive is a WD 1TB SSD running Ubuntu 18.04 LTS... I have 2 arrays running off 1 LSI Card... 16 x 8tb IronWolf inside a RaidMachine (Raid 6) [my main data] 11 x 10tb Exos inside a SuperMicro (Raid ...
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45 views

Windows software raid drives deactivated

Not sure what to make of this behaviour, but here goes. I have 3 Seagate 4 T drives in a windows 2012 r2 server in a software raid 5. Recently, I logged onto the server to see that 2 disks (...
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283 views

SMART failure of a 4 disk software RAID10, mdadm, 2 drives show REMOVED state

Running Fedora 32 connected to a 4-port e-sata. One of the drives is clearly failing, with this message in the logs: smartd[1169]: Device: /dev/sdd [SAT], FAILED SMART self-check. BACK UP DATA NOW! ...
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306 views

How to interpret conflicting status data between `smartctl` and `mdadm`?

I have a HDD which is a member of a RAID10 array. smartctl and mdadm give me conflicting indications of its status. smartctl claims that the disk is FAILED: $ sudo smartctl -H /dev/sdf smartctl 7.0 ...
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How beneficial are self-healing filesystems for general usage?

I have recently looked into advanced filesystems (Btrfs, ZFS) for data redundancy and availability and got interested in the additional functionality they provide, especially their "self-healing" ...
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643 views

Recovering mdadm 4-disk RAID5 array with 2 out of date disks

Edit: The scenario in this wiki, where 1 drive has a slightly lower and another a significantly lower event count than the rest of the array, suggests assembling with --force while leaving out the ...
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173 views

Have I lost data? Can I copy a MD superblock from one drive to another?

My friend's RAID5 has lost two disks -- one failed months ago, apparently, but the other dropped out and the data is believed to be okay. I can run mdadm --examine on (clones of) the two surviving ...
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130 views

Can I configure RAID 1 with production server running?

I am facing issue configuring RAID 1 with currently running production server (Ubuntu 18.04 LTS). Currently my configuration is sda 8:0 0 1.8T 0 disk ├─sda1 8:1 0 1M 0 part └─...
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101 views

mdadm raid5 starts recovery right after creation

just for getting some experience with mdadm I've put some HDD together and try a bit. I have 2 250 GB and one 500 GB HDD. I know thats not optimal for RAID5 and I'll only get 500 GB capacity in total. ...
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181 views

Fixing a readonly-filesystem on Raid-1?

I have an Ubuntu 18 server using a software RAID-1 array, and smartctl is indicating that my /dev/sda is failing. Both Throughput_Performance and Reallocated_Sector_Ct are listed as "FAILING_NOW". ...
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What is the difference between RAID defined by host controller versus Linux RAID defined by software?

I have a Proliant DL380 G6 Server with 4 146GB 2.5" SAS drives. In Ubuntu, (I'm using Webmin to manage), I see a single physical volume, as though there actually is only one disk. If I run the ...
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77 views

Boot failing due to SMART error status?

I have an Asus server that was refusing to boot, reporting: SATA Port 1 : Hitachi HDS721010DLE630 S.M.A.R.T status bad, backup and replace So I went into the bios, disabled "SMART status check", ...
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82 views

ZFS 3-drive setup on Debian

I have a machine with 3 2TB SSD drives, I want to configure openzfs at least on two of them. The root partition has ext4 and if possible I would like to avoid reinstalling everything, so I am ...
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768 views

Promoting a secondary plex to primary

I have a Windows Server 2008 R2 install that uses Windows software RAID to mirror the drive. The primary drive is failing. I installed a new drive to the set and syncing is almost complete. Once the ...
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Single software RAID partition missing after replacing failing HDD

I have a raid-1 with 5 partitions (md0 - md4). Last night one of the HDDs failed (the faulty RAID partition was md4), I removed it, replaced it with a new one and now in the rescue system suddenly ...
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2answers
130 views

Software linux raid using physical passthrough disks

I'm using Vmware ESXI and I followed this guide to pass through 2 physical disks for a raid 1 array. If I set up an mdadm software raid using these two physical passthrough disks will something go ...
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How to configure RAID-5 for OS root (Ubuntu Server 18.04)

I have a fresh dedicated server I have provisioned running Ubuntu Server 18.04 and with 3x480GB SSDs (no hardware RAID controller though). The UI of the hosting provider will not allow the “/boot” or “...
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308 views

Can I make a mdadm raid on a file, not a block device?

I would like to play with mdadm, the Linux RAID system. I want to see what happens when you fail a drive, when you grow the raid etc etc. My initial thought was to create 4 equally sized files (...
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55 views

RAID 1 Reliability: 4 drives vs 2 Drives + 2 Spare Drives

Which is likely to be more reliable (safer data + lower downtime): having 4 drives in RAID 1 OR having 2 drives in RAID 1 plus 2 spare(s)? In other words, is there an advantage in having spares when ...
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2answers
3k views

Will I be able to expand Synology later without losing data with regular RAID

I just got Synology 918+ and bought 2x10 TB Hard drives. Before I set up, I just want to avoid getting into trouble in the future. I don't want to use SHR (Synology hybrid raid) because of several ...
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40 views

usb jbod enclosure, software raid1; after reboot, mdraid using wrong devices

I mirrored two disks in a USB enclosure on my Arch box, created a filesystem, mounted it, copied a bunch of data over. Everything was great. Then I waited until the md sync was done and rebooted... #...
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3k views

Ubuntu: /dev/sdb1 is apparently in use by the system; will not make a filesystem here

I get this error when I try to format dev/sdb1: $ mkfs.ext4 -L data /dev/sdb1 mke2fs 1.42.13 (17-May-2015) /dev/sdb1 is apparently in use by the system; will not make a filesystem here! where /...
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5k views

Degraded Array. RAID 6 with three disk failure

I have an array of disk with RAID 6 and 16 Drives. Days ago three disk failed and the Array was marked as Degraded. I cannot access the data and I cannot boot into the Operative System. I need access ...

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