2022 Developer Survey is open! Take survey.

Questions tagged [raid5]

RAID (redundant array of independent disks, originally redundant array of inexpensive disks[1][2]) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of redundancy and performance (via parallel communication) is required. RAID 5 is a specific implementation.

Filter by
Sorted by
Tagged with
0 votes
0 answers
16 views

Redhat don't show a single logical RAID5 drive, but I did it on hp storage machment assistant

I have a HP Proliant Microserver Gen10 plus, with 4 disk of 1T each one and configured for RAID5 from hp storage manager assistant. The configuration for create the array was good without errors. But ...
user avatar
0 votes
0 answers
21 views

RAID5 compatability: zeroed superblock: WD Red 8TB drives: wd80efax-68LHPN0 and 2x 68KNBN0

Summarizing the problem: I have been scraping by with JBOD for years, but finally need a real 'micro data center'. I bought 3 drives for my centos8-stream box over a couple months, but I have heard it ...
user avatar
  • 1
2 votes
1 answer
33 views

RAID 5 with Windows Server 2016 R2 - 45 drives - 10 hot spare

I have a 45 drives server that will be running Windows Server 2016 R2. It will be fully populated and utilizing RAID 5 and I want 10 of the drives to act as hot spares. We have been searching all over ...
user avatar
0 votes
1 answer
23 views

Synology SHR Volume - Migrate from 3 disks (RAID5-ish) volume into 2 new disks (RAID1-ish)

What I have: 3 x 6TB SHR Volume with 12 TB redundant storage (1 disk recently broken) What I want: 2 x 18TB SHR volume with 18 TB redundant storage (I'll expand the volume after the migration) Of ...
user avatar
15 votes
1 answer
2k views

What's the difference between a "degraded" RAID 6 array and a "clean" RAID 5 array?

Suppose you have two RAID arrays, one with N disks and one with N+1 disks. The array with N disks was formatted as a RAID 5 and left alone, while the other array was formatted as a RAID 6 before one ...
user avatar
  • 300
1 vote
2 answers
47 views

RAID Recommendation Request: 2x RAID5 arrays, 1 Large RAID5, RAID10?

I just ordered a new PowerEdge R650 which will be the primary server for our company. It will run HyperV with 10 - 12 virtuals on it, mostly Windows but some Ubuntu. All the standards: domain ...
user avatar
  • 73
1 vote
2 answers
45 views

Raid Array with only a Partition of some Disks

I was wondering if one could set up a RAID-5 array such that only some space of the third disk is used in the raid array and the left over space can be used as a non-raid volume. I have three HDDs ...
user avatar
  • 13
0 votes
1 answer
87 views

How to partition disks in Debian 10 installer for RAID5 on UEFI machine?

Installing Debian 10. I have 3 disks I want to use as RAID5 on a UEFI machine. I have tried several configurations that either led to failure to install grub or failure to boot (stuck in grub-rescue ...
user avatar
0 votes
0 answers
13 views

Expand RAID 5 Logical Disk from 3 to 5 Disk not possible (Adaptec Raid Controller 7805

I'm trying to expand my RAID5 volume but I can't select the available disks in the dialog. [RAID5][1] [1]: https://i.stack.imgur.com/PC6ot.png Data Protection/RAID Consistency Check is set to Disabled....
user avatar
-1 votes
1 answer
45 views

Can RAID 5 be made, when one or more of the disk is actually RAID 0?

I have this question since (I think) 3 years ago, but since I was never actually planning to build server, I just shrug it off. But tonight, I literally can't sleep because of this burning question. ...
user avatar
1 vote
2 answers
131 views

Rebuild RAID5 with uncorrectable sectors on multiple disks

My software RAID5 (mdadm) system consists of five disks. Recently, I get I/O errors when reading certain files. Most of the other files are still readable. At first, I was planning to find out which ...
user avatar
0 votes
0 answers
32 views

Windows RAID drive performance suddenly dropped

I have a Windows system that has as a data drive, one RR640L controller. Attached to this controller are four 2TB drives in a RAID5 configuration (2 Seagate ST2000VN000 and 2 Samsung HD203WI). ...
user avatar
  • 157
0 votes
2 answers
57 views

P420i controller / 2 disks failed in RAID5 / RAW FS after parity initilization

We woke up this morning with 2 failed disks on RAID5 with a single hot-spare configuration. Hot-spare disk didn't replace any damaged disk maybe because there are 2 disks failed at the same time. ...
user avatar
  • 1
0 votes
2 answers
67 views

Add disk to QNap Raid 5

I have a QNap TS-569 Pro configured with Raid 5 of 4 hard drives of 1 Terabyte each. It has 5 disk slots and I want to increase the size of the Raid of another Terabyte. Reading the manual seem pretty ...
user avatar
0 votes
0 answers
242 views

RAID5 array is rebuilding after a fresh install of Ubuntu 20.04 Server

I installed Ubuntu 20.04 Server on a system with three Seagate 6TB drives. I have partitioned both sda and sdb in two partitions. The first partition on each disk is of 5G. I combined those two 5G ...
user avatar
3 votes
1 answer
251 views

e2fsck cleans a filesystem and then a few minutes later (after a lot of reads) there are errors

The filesystem is on an LVM RAID5. It appears to be working correctly: $ sudo pvs [sudo] password for jrwren: PV VG Fmt Attr PSize PFree /dev/sda2 datavg lvm2 a-- <7.28t ...
user avatar
  • 370
0 votes
1 answer
889 views

mdadm : assemble raid5 created with missing disk

2 years ago i've created a raid5 array with 2 disks like this : mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 missing Now i've rebuilt my system with latest ubuntu server LTS,...
user avatar
0 votes
0 answers
33 views

siem Qradar x3650 hardware

I have a server x3650 with a hard disk "failed". I bought a new hard disk to put it in its place, but when I put it in the server it gave me the status is unconfigured good so I tried to ...
user avatar
0 votes
0 answers
51 views

Do I need a spare slot to replace a drive in an LVM raid array?

I am planning to set up an LVM raid 5 array and looked at how to replace a faulty drive. I found the replace command lvconvert --replace dev_to_remove vg/lv [possible_replacements] For this to work, ...
user avatar
0 votes
0 answers
31 views

Mounting 32Tb RAID Volume Causes Server To Crash

I have a 32Tb NTFS RAID 5 volume. 5x8tb SATA, LSI 9361i+Supercap. Was working fine until it started behaving strange on day - drive name vanished and data seemed to vanish. Then rebooted, Windows 10, ...
user avatar
  • 2,493
0 votes
0 answers
66 views

Recover mdadm array

I had a raid5 array built with mdadm and btrfs filesystem on top of it. My sata card failed and all my drives dropped at the same time. What should I do if I wanted to rebuild the array or restore ...
user avatar
  • 111
1 vote
1 answer
163 views

How to create a more than 64TB software RAID 5 Volume on Windows? [closed]

A customer is looking to create a RAID 5 array on Windows 10 Pro, but Windows RAID 5 only allows him to only create 63 TB volume instead of his 112 TB (he has 8x16 TB HD). Is there any way to create a ...
user avatar
1 vote
1 answer
134 views

What Happens When You Write Data To Raid While It Is Scrubbing?

I have a RAID 5 setup with almost 15TB of data capacity. In the past I have let it go unchecked for too long, and found that multiple drives had SMART errors and I want to prevent bad blocks. I am ...
user avatar
0 votes
3 answers
116 views

I cannot expand RAID5 capacity on an Adaptec RAID 71605, an "expand" in ribbon is greyed out

I have 4 disks RAID5 array and want to add additional identical disks in order to expand the capacity. I do everything as instructed, but "expand/migrate" buttons are greyed out, so i cannot ...
user avatar
0 votes
0 answers
58 views

Getting high read await in Zabbix monitoring, is this a common behavior for RAID5 disk array?

We are running a Oracle 11.2 DB on Redhat 6.8, and disk array is configured as RAID5, which is using a Lenovo 730i RAID adapter. I checked RAID policy and found that "Read Ahead Always" and &...
user avatar
0 votes
1 answer
42 views

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 ...
user avatar
0 votes
1 answer
27 views

Ways to make a backup on RAID5 filesystem (mdadm) with many files

I have a NAS containing RAID5 array (5.4TB in total, 2.9TB in use) using mdadm. Now I plan to modify some hardware of it (especially SATA controller), so I'd like to have a whole backup of this RAID5 ...
user avatar
  • 13
0 votes
2 answers
474 views

Creating a raid5 array with 4 disks in Ubuntu is only giving me 3 active devices

When installing Ubuntu 18.04 LTS in a new machine, I'd like to create a RAID5 array. I have 4 1TB disks available. However, since Ubuntu can't boot into the RAID5 array, I'm having to use one of the ...
user avatar
  • 123
1 vote
0 answers
59 views

RAID 5 - Data corrupted after drive failure?

I have a workstation that uses an adaptec RAID 71605 controller with 4x8TB WD drives in a RAID5 config. One of these drives failed, and after replacing it and rebuilding the RAID, a lot of the data ...
user avatar
  • 11
0 votes
1 answer
227 views

Need confirmation on how iSCSI RAID storage works

I have a Dell PowerEdge server with Windows Server 2019 that has an iSCSI target set up with 30 iSCSI LUNs. The HDDs are set up in a RAID-6. I have some IP cameras that have the ability to record ...
user avatar
  • 1
2 votes
0 answers
599 views

mdcheck hangs when attempting to stop check

I have a raid5 array that has a check run on it once a month. It is configured so that the check runs for 6 hours from 01:00 and then stops. The following nights it will resume the check for another 6 ...
user avatar
  • 101
3 votes
0 answers
190 views

Can iostat output show mismatched read data for mdadm raid5 array?

I'm trying to understand this iostat output: tps kB_read/s kB_wrtn/s kB_dscd/s kB_read kB_wrtn kB_dscd Device 500.30 58.9M 19.4k 0.0k 329.1G ...
user avatar
  • 89
0 votes
1 answer
48 views

highpoint rr62x RAID 5 status disable, recover saying parameter error

I have been using a Highpoint rr62x controller(BIOS version 1.3) for about a decade now. The RAID-5 volume is containing 4 disks-each 3TB. For the last five years my RAID has been disabled. I have ...
user avatar
0 votes
1 answer
275 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 --...
user avatar
2 votes
2 answers
339 views

md raid5 extremely slow on discard

Hi all md raid experts Running Centos 8 (with all latest updates, kernel 4.18.0-240.1.1.el8_3.x86_64) where I have 3x2T Samsung SSD 860 QVO 2TB in raid5 (to be used as base for some KVM VMs) and when ...
user avatar
  • 121
3 votes
2 answers
383 views

What is the overhead of ZFS RAIDz1/2 in HPC SSD Environment?

Example hardware / host: Modern 64 Core CPU, 128GB Memory 8 x Micron Pro 15.36TB u.2 SSDs SSDs connected by dedicated Oculink per device (no backplane or PCIe sharing) Ubuntu 20.04 Use case: A ...
user avatar
  • 376
1 vote
1 answer
146 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 ...
user avatar
  • 236
1 vote
0 answers
270 views

Dell Power Edge R940 RAID Failure: the foreign configuration cannot be imported since the configuration is not complete

Dell Power Edge R940 RAID 5 Array BIOS version 2.3.10 PERC H740P Adapter Some of our guys pulled of all of our disks, one by one from the server while it`s worked, to rewrite theirs serial numbers. ...
user avatar
  • 19
1 vote
1 answer
188 views

Is there a way to view the progress of a RAID 5 rebuild on a G Technology G-Speed Q?

I've got a G Technology G-Speed Q configured in RAID 5 fitted with 4x 2TB 7200RPM drives. The top drive started flashing amber and the red light at the bottom also started flashing. I got a new 2TB ...
user avatar
1 vote
1 answer
797 views

I cannot expand RAID 5 capacity on an Adaptec RAID 71605

I have a Supermicro CSE-815 X8DTU-F server. In it I have installed an Adaptec RAID 71605 controller with 4 SAS HDDs. With them I set up a RAID 5 with 3 discs only. Now I have connected the disk that ...
user avatar
  • 11
1 vote
1 answer
126 views

How can I recover data from a five disk raid 5 on HP Proliant DL 380 [closed]

How can I recover data from a five disk RAID 5 on HP Proliant DL 380 where four of the five disks are reporting a SMART error. I have some critical data on the failed logical drive and checking online ...
user avatar
-1 votes
1 answer
54 views

Data recovery for RAID 5 [closed]

In RAID5, if 2 disks fail does one lose all data? Say there are 250 4Tb drives and 2 drives fail does one lose all data of 250 drives? How do data centers ensure continuous storage? In a server where ...
user avatar
1 vote
0 answers
150 views

RAID 5 reshape halted after hardware failure, tried to add disk again but, now it is added as spare

I have a 4 disk RAID5 (at a system with centos7). Space was all used up, so decided to add another disk and grow the array. So purchased a SATA card, added it to the machine and added disk on it. Then ...
user avatar
0 votes
0 answers
55 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 (...
user avatar
  • 176
0 votes
1 answer
35 views

Need Help Restoring A Failed RAID5

I was handed a Seagate NAS with 4 HDDs set up as RAID5. One of the drives failed: won't spin up, clicks, etc. The other 3 drives are fine. They spin up, when connected via USB, the data on them is ...
user avatar
  • 1
1 vote
1 answer
1k 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 ...
user avatar
  • 13
4 votes
3 answers
709 views

SAS RAID5 Disk failure, replacement enclosure not matching

A SAS disk in RAID5 array failed yesterday and I'm about to replace it, however I noticed the front enclosure wasn't matching the rest of the disks. The array consists of 300GB 10K SAS disks with the ...
user avatar
  • 244
1 vote
1 answer
391 views

mdadm raid5: All disk appear as spare

I had a power plug removed for 2 of the 4 disks of my raid 5. Since then it cannot start. Even with --run --force, --readwrite, etc. I quickly saw it so the data should not be (too much) corrupted. ...
user avatar
  • 111
1 vote
1 answer
456 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 ...
user avatar
0 votes
1 answer
1k views

Raid Status - Online vs Ready vs Foreign

What does Raid state Online, Ready or Foreign means? What other state can it be? What needs to be done in such state? I think Online is the only safe state. What are the DO's and Don't during ...
user avatar
  • 1

1
2 3 4 5
11