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Questions tagged [raid]

RAID, an acronym originally for Redundant Array of Inexpensive Disks (today usually interpreted as referred to as Redundant Array of Independent Disks), is a technology that provides increased storage performance and reliability through redundancy by spreading data across multiple disks using various algorithms (RAID-levels). RAID can be implemented in hardware storage controllers, or in software, usually as operating system/kernel features.

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Hybrid RAID (SDD+HDD) gives unexpected results

I am doing some experiments with hybrid RAID in Linux. My test consists of the following: 2x256GB SSD in RAID 0 (/dev/md1) 2x256GB HDD in RAID 0 (/dev/md2) Then I made md1 and md2 into a RAID 1 (/...
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Setting up XFS filesystem on software RAID 0 [duplicate]

I have a software RAID 0 set up with the details $ mdadm --detail /dev/md0 Version : 1.2 Creation Time : Mon May 20 07:56:37 2019 Raid Level : raid0 Array Size : ...
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2answers
489 views

Investigating beyond RAID for disk cluster in a server, is Dynamic Disk Pool comparable? [on hold]

With the development of hyperconverged systems, we can see other technology than RAID to handle distributed storage (like ceph for example or VSAN or distributed storage like in nutanix). But is ...
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2answers
247 views

RAID 5/6 rebuild time calculation

I plan to build some storage schema but I have to anticipate downtime, maintenance and rebuild Time. Some guys said to me that a 10 disk RAID6 of 10To (SATA) rebuild will last for about a week ! ...
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1answer
43 views

HP DL360 G7 Smart Array P410i drive mix [on hold]

i have HP DL360 G7 Smart Array P410i with 3xSAS HDD 146 GB in RAID5. I decided to change hard drives to SSD ones (3x180 Intel SSD). My idea was to change drives one by one and wait for RAID rebuilds. ...
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20 views

Reload of mdadm.conf live server

Is there a way how to make system to use updated mdadm.conf without reboot? I added spare group, but its not used yet - when there is a disk missing, spare is not automatically attached. I was told ...
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3answers
55 views

Understanding Disk Array Availability

I'm new to this thus I'm trying to understand about calculating Disk Array Availability (DAA). What I have understood so far is that availability is always 1, and Failure = 1÷MTBF, and that is all I ...
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2answers
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Huge data loss in RAID 1 array [closed]

I've recently faced a huge data loss (everything from last 5 months) after one of my disk crashed, even if the RAID array is still fine. This disk was a SSD with my root partition (ext4), mirrored in ...
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1answer
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mdadm does not show every device as active

Recently, I had to resize a linux software RAID array. It has been a little bit complex as I was forced to do many steps to grow the device size while shrinking the number of members from 14 to 6. It ...
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1answer
42 views

Minimizing the write-outage time of the database deployed on AWS EC2 [closed]

Say we have a relational database on EC2 instance. It has a set of EBS volumes in RAID mode. We perform a procedure of backing-up this instance. How to minimize the time during which we cannot write ...
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1answer
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raid1 will not work when I physically remove “removed” disk in Ubuntu 18.04

/dev/sdc1 and /dev/sdd1 is raided (RAID1) into /dev/md3. /dev/md3 is encrypted with luksSetup. Last night I got DegradedArray events for /dev/sdc1. I shutdown the system, physically removed the disk,...
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How to automate getting status of a RAID volume on AMD (A55) RAID controller in Windows?

We have a PC used as a Windows server. There's a RAID 0 volume set up using built-in controller (AMD A55 chipset). How can we automate getting volume status data? I managed to find rcadm tool, but it ...
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0answers
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Degraded(Interim recovery) - HP Microserver G8

I have a HP Microserver G8 with B120i and P222. The P222 is not working properly good. I have a post in HP forum: https://community.hpe.com/t5/Disk-Enclosures/RAID-P222-all-time-founding-failed-disk/...
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3answers
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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 ...
3
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1answer
28 views

Stubborn Foreign Disk on PERC 710 raid controller

I have a server that crashed (don't know why) and it lost access to most of its 24 drives. The server needed a full power cycle to make the disks show up again, except one disk needed a second go (was ...
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0answers
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what does UNCONFIGURED BAD mean

have a few SAS ssd's, the $4000 kind {manufacturer name withheld}. I have had two now go to unconfigured bad after 1-2 hours of only powered on use, such that I am skeptical that the drive is not ...
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1answer
19 views

Unwanted md arrays created while creating SW RAID6 pool

I ran into issue where while i am creating bunch of RAID6 arrays on storage server, some unwanted random arrays were created with them for no reason. I am using old disks but i ran mdadm --zero-...
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0answers
36 views

mdadm array does not assemble correctly

After a hard reboot, my raid10 array (made of 4 disk partitions) failed to reassemble. After many trials, i attempted the "nuclear" option of zeroing the superblocks and re-creating the array with the ...
3
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1answer
70 views

Smart Array P420i controller replacement

I have two identical servers with Smart Array P420i One server has 4 physical drives, which form 2 logical drives (2 + 2 raid 1) Second server also has its raid configuration with two physical drives ...
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0answers
16 views

Winload.efi missing on RAID HDD

We have a workstation running Windows 8.1. At system start the error "winload.efi" missing occurs. Now I wanted to drive a system repair. The problem is that the hard disk is hanging in a software ...
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1answer
33 views

Ubuntu Not Starting Second RAID Array

Before I start let me say that I am by no means an expert with this stuff, if you see something that you would have done differently let me know. Ok, so I have a Ubuntu 18.04 server with a boot drive ...
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2answers
377 views

What's the best RAID array for fault tolerance [duplicate]

When setting up a server, I was told it needs to have really good fault tolerance. What RAID array would give me the best fault tolerance?
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1answer
40 views

How to restore or recover a Logical Drive (RAID 5) on HP Proliant DL380 G6 (Windows Server 2012 R2 Standard)?

I have shutdown the server to replace one failed SCSI HDD (Port 2i: Box 1 : Bay 7) running on RAID 5. The rebuilding for the RAID was completed successfully. However, I noticed the Logical Local Drive ...
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0answers
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How to view progress in ESXi of RAID recovery using MegaCLI?

We replaced a disk in our raid 1 array and the light is green on the disk. How can we see the rebuild status? I saw this thread on the vmware community https://communities.vmware.com/thread/530391 ...
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Enabling drive write cache using Smart Storage Admin CLI

Using Smart Storage Admin, I am trying to enable DWC. Using this following command, I confirm slot0 is the only option and it is healthy. sudo /opt/smartstorageadmin/ssacli/bin/ssacli ctrl all show ...
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1answer
27 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 ...
3
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1answer
77 views

RAID 10 Configuration Settings with different disks

I have just started configuring a server with 4 SSD drives. Each drive pair has the same capacity, but not the same throughout the 4 disks. I want to use RAID 10, and I have tried different ...
2
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1answer
29 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 ...
2
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1answer
29 views

I lost the RAID control drive position

I have a HP Proliant DL360 with RAID controller. I had some trouble in the power supply so I removed the 6*250 drives without positioning the drives After fixing the problem power supply I need to ...
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2answers
89 views

Resize partition using parted

There is a pretty big file-server(~85TB) running xfs file system, on Centos 6.9 which we use for our backups. We were out of space, so I added 10 new similar drives to the array and rebuilt RAID 6 ...
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1answer
38 views

Throughput limit of a raid controller

I am a bit confused about the maximal theoretical throughput of my HP P410 Controller. When using SATA drives, they are limited to 3Gb/s per physical link (about 300mb/s real speed). Does it mean ...
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1answer
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New to servers, just recieved an intransa va expandr

Intransa VA-EXPANDR 12 2 TB Disk array question. I received this 12 disk array along with a dell poweredge 2850. I would like to set up a RAID but i'm having trouble understanding how to hook up to ...
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3answers
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HP P840 HDD RAID 5 many strange drive failures

I've been using a RAID5 HDD storage (8x6TB) at my HP P840 for like 2 years now and it has always had unusually many drive failures. Everything was good for half a year, but now drives are failing in a ...
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1answer
50 views

Can we add more volumes/disks to an existing mounted ext3/ext4 mountpoint?

Have a quick question on adding space via a new disk/block device to a non-root/ext3 mount-point that has data and is mounted. I Have an ext3 mountpoint '/u01', which has a device '/dev/sdb' attached....
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1answer
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How can get RAID bus ID by label?

I have some problem of identify RAID adapter in Centos 6.5 I have some LSI RAID adapters in one server. For any RAID adapters I cat get bus id by lspci. Also I have list of block devs (for example /...
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1answer
35 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 ...
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1answer
54 views

Device missing from mdadm raid, but it exists, and looks fine?

I have raid 5 over 4 devices: sda10 sdh10 sdi10 sdf10. All these devices are available, and smart doesn't show errors (sdf was, but i replaced it with new disk, resynced, but then current situation ...
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1answer
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ZFS Heavy Write Amplification due to Free Space Fragmentation

I have setup ZFS RAID0 for PostgreSQL database. The Storage and Instances are in AWS EC2 and EBS volumes. NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT pgpool 479G ...
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1answer
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HP smart array p212 raid controller. Only two arrays possible? because of missing RAM on raid card?

I bought a HP Proliant gen8 microserver. In it I installed 1 * 500GB SSD connected to SATA port 5 as a bootable disk and 4 * 3TB HDD connected to a HP smart array p212. What I would like to do is ...
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0answers
104 views

Fix Crashed/Degraded RAID when Data is intact but Disk Dropped from Array (btrfs/Synology)

The Volume on my Synology Expansion crashed and can't recover on its own. Drive is probably OK. It happen after cleaning the device from dust. Until that time Volume was also OK so I believe it ...
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2answers
58 views

RAID controller overheats in certain cases

I've been having problems with my builds' RAID controller overheating. I found that the case is to blame, but I can't figure out how and why it would do that. I used to use 4U CompuCase RA455A00 for ...
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1answer
58 views

Replacing RAID 1 with larger drives - professional standards

I work with one of the biggest hosting companies on the planet. I got a dedicated server with hardware RAID 1 and two SAS 15k disks. I asked my hosting company if they could replace SAS with much ...
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2answers
36 views

RAID Arrays are not assembeling after 2nd reboot

I have an issue where i assemble RAID0 over RAID6 via mdadm as normally, after that i can create file system and mount newly made RAID60 arrays no problem. I update my mdadm.conf, update initramfs an ...
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1answer
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mdadm --scan --examine --config - nonexisting arrays

I came across weird situation where after running mdadm --examine --scan --config=mdadm.conf >> /etc/mdadm/mdadm.conf I get to see ARRAYS that are not yet created 11-15. Those are going to be ...
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36 views

3ware, New Disk

This is when the problem first started showing an error on Unit 0. https://i.stack.imgur.com/JHe7D.jpg Device error on port 4, I found this drive and removed it. https://i.stack.imgur.com/9K3OG.jpg ...
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1answer
62 views

Megaraid storage manager. How to add drive in RAID 0 with OS

I have a LSI megaraid sas 9271-8i controller and 8 physical drive. I have error on Slot 0. Media count error: 1568 and Pred fail error: 12. And I have error such as: How can I check a partition of ...
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1answer
44 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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0answers
47 views

RAID - strip setting 128KB/512KB/1MB - video stream storage

Iam building video storage server for IPTV usage and iam wondering about setting of RAID strip. Its going to be large storage, RAID60 (RAID6 - 6x3TB / RAID0 - 3xRAID6) so its around 30TB each volume. ...
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1answer
76 views

Best configuration for a software RAID 10 SSD for VM xenserver [closed]

I have xenserver servers. For storage of virtual machines, I use the software RAID 10 (the disks are directly in the servers). I would like to know the best configuration for 4 SSD disk in RAID 10 ...
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0answers
38 views

How to mount Apple RAID on Debian server?

I have two Samsung ssd's in a RAID 0 configuration. It was made with Disk Utility on macos Mojave. I would like to mount them on a Debian server but I can not figure out how or if it is possible at ...