Questions tagged [software-raid]

RAID solution handled by the operating system.

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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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7answers
4k views

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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0answers
14 views

mdadm raid10 recovery after failed reshape

I had raid1 and tried top convert it to raid10 with 6 drive. I coverted it to raid0 then to raid10 with 4 disks. After reshaping was done i added other 2 disks and fs crashed and i assumed that reboot ...
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1answer
169 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Recovering mdadm 4-disk RAID5 array with 2 out of date disks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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0answers
9 views

New build not getting full bandwidth from SSDs?

I'm building a new FreeNAS server that I'm looking to use for 4k video editing (fast copy/streaming of large files). I've got everything built out and I thought I had it spec'd and designed correctly ...
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1answer
28 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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1answer
73 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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1answer
53 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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1answer
24 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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2answers
56 views

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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0answers
50 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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1answer
67 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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1answer
125 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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0answers
22 views

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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24 views

P2V CentOS 6.10 with Linux raid

We are trying to virtualize a CentOS 6.10 box that is apparently running a software raid (I think). It is tricky verifying as the machine is remote, and the users don't have a clue. The method we've ...
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25 views

How to downsize partition and remove software RAID0 without lossing data

I have Fedora 26 Linux virtual machine under XenServer with 2 virtual disks, capacity is 2x 2TB. Under Linux, there are software RAID0 and in OS is 4TB capacity. Now I do not need 4 TB and need to ...
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2answers
63 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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0answers
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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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90 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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1answer
45 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
528 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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0answers
31 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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1answer
804 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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mdadm unable to assemble after OS reinstall

i had reinstalled centos 7 which has raid0 working fine previously. now my partition look like this: [root@ns31132644 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 223.6G ...
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7answers
4k 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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1answer
357 views

How to add hot spare to software RAID1?

I have a CentOS 7 server. It is running a software RAID 1 mirroring three disks. I want to add a 4th disk to act as a hot spare. My intention is that in the event of a failure of one of the three ...
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0answers
28 views

Creating a script for Kickstarting servers; issue with created softraid 1 server based on CentOS 7

First off; I am sorry if my title is incorrect, but I didn't want to "clutter" it too much. I am creating a bash script which is used to install various servers based on CentOS 6 and CentOS 7 with ...
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2answers
48 views

can I upgrade soft raid0 to raid10 or raid01? and how?

currently status: 4 disk part 200G each, total 800G using raid0 raid0, md0: sda1+sdb1+sdc1+sdd1 and I want to add another disk part sdf1(>800G) combine with md0 to make a raid10, like raid1, md1: ...
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1answer
59 views

mdadm raid5 was added as a spare to itself

I have a raid 5 device created with mdadm. I was working on it and long story short, I wanted to type mdadm --manage /dev/md127 -a /dev/sdd, but I accidentally typed mdadm --manage /dev/md127 -a /dev/...
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1answer
25 views

Single drive performance in RAID1

I see many tools to measure the performance of RAID1. But how to measure the performance for each SSD in RAID1?
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1answer
33 views

Access clean RAID5 on new machine using 2 of 3 disks

A server of mine is dead. On the server I had 3x disk with a software raid on the second partition of every HD. Now I have inserted two out of three HDs in a PC (no place for the third!). Here what I'...
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0answers
71 views

How do I add disks to a mdadm RAID 6 array behind bcache?

My server running Ubuntu 18.04.3 LTS, is laid out as follows: An SSD with the system files A RAID6 array of 4 disks, (2 data and 2 parity) sitting behind another SSD acting as a bcache containing my /...
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0answers
201 views

How to determine stripe size of RAID volume on Windows Server 2016?

I have an existing Windows Server 2016 RAID 5 volume, and I want to know the RAID stripe size. How can I determine this? No hardware RAID, just software, so physical disks are presented directly to ...
2
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1answer
155 views

How can I generate/or edit a grub.cfg on each EFI partition that refers to the ubuntu installation on the same physical disk?

I have an install of Ubuntu 16.04 server set up on two disks with software raid across two large partitions. The start of each disk contains an EFI partition. I would like to be able to boot from ...
3
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1answer
446 views

Recover unknown raid setup

I have 2 disks, they are the same make, model + size. Both of them have Linux RAID partitions on them. I think they used to be in a software raid1 array together, but I am hesitant to just jump in and ...
3
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3answers
347 views

Windows Server 2016 - SSD + HDD in SW RAID1. Drawbacks?

This is a weird question I realize that, but hey. So, I have an SSD in my server. It's a datacenter SSD, I guess (and hope) it will not have any issue for the next few years - as I barely put any ...
5
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1answer
345 views

How to recover mdadm raid6 array? mount: can't read superblock. 8/13 drives show all drives present, 5/13 drives show only 5 drives present

I rebooted my server today to find it hanging. I commented out the entry in fstab that loads /dev/md0 and the machine proceeded to boot. The raid was accessible and working prior to the reboot, I only ...
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1answer
45 views

Drive reports as failed when attempting to assemble a RAID array created on another machine

I'm working on a script to automate the process of creating a RAID array and am currently trying to figure out how to get multiple machines to recognize the array so the data can be transferred after ...
2
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1answer
179 views

Problems with auto-mounting MDADM-created RAID array and creating RAID device

I'm working on a script that automatically detects new drives that have been added so they can be formatted and turned into a RAID-5 array. I've been able to detect the drives and format them with ...
1
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1answer
272 views

How to recover from drive failure on lvm software raid 10 in Linux?

Below is how I created lvm software raid10. Create Physical Volumes pvcreate /dev/nvme0n1 /dev/nvme1n1 /dev/nvme2n1 /dev/nvme3n1 Create Volume Group vgcreate my_vol_grp /dev/nvme0n1 /dev/nvme1n1 /...
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2answers
326 views

PERC H330 or Windows Storage Space on Raid 5

I'm trying to build a raid 5 array for our file server using the following: 1. Dell Poweredege R530 - server 2. Windows Server 2016 - OS 3. 3x 4TB SAS - Hard Drives 4. PERC H330 mini - embedded ...
2
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1answer
388 views

mdadm: Resume initial sync

I have a new md RAID10 that I created (on a Synology DS416slim, which is besides the point), which was in the process of initial sync: root@ds416slim:~# cat /proc/mdstat Personalities : [linear] [...
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3answers
273 views

Why has open-iscsi two times slower writes than Samba via 10G Ethernet?

On my local file server I have raid-6 on 7x HDD drives. dd if=/dev/zero of=tempfile bs=1M count=2048 conv=fdatasync Local speed test gives me 349 MB/s write speed. Remote writes to Samba from SSD (...
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1answer
37 views

Questions about RAID Creation

I'm currently working on a project that requires me to write a script to identify a set of drives added for the purpose of storage and install them as a RAID array. I'm having trouble finding ...
2
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1answer
318 views

Does KVM/QEMU support mdadm RAID5 properly?

I'm not able to get anything close to usable performance using a guest file located on a mdadm RAID5 array. I've believed I optimized all the parameters of the array and filesystem for best R5 ...
0
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1answer
57 views

Internal HDD keep being dropped

I own a server on which I run flexraid and since a couple of weeks, I get the issue that whenever the server is doing some heavy operations on the RAID, one or more harddrives get dropped. In order ...
2
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1answer
668 views

Combination of ZFS and Hardware to gain Raid 51

I'm looking into RAID solutions for a very large file server (70+TB, ONLY serving NFS and CIFS). I know using ZFS raid on top of hardware raid is generally contraindicated, however I find myself in an ...
0
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0answers
102 views

raid not spinning down - mdadm issuing syncs?

I have an issue with an archival server that is running a RAID 5. The server is being accessed only every couple of days, so I want these disks to spin down when there is no activity for a while. ...
1
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1answer
184 views

Extending Linux file system after resizing the EBS volume

I have resized the EBS volume using the AWS console Modify Volume. This is what the lsblk command returns before any change: $ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvdn 202:208 0 ...
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1answer
422 views

Auto-assemble RAID1 Array with mdadm on CentOS 7.6

I'm new to this particular area of the Stack Exchange network so please be kind. We are experiencing issues with auto-assembling a RAID1 Array created with mdadm on CentOS 7.6, and no matter what we ...

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