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.

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HP DL 360 Gen 10 with WD RED SSD Drives? [closed]

We have an HP DL 360 Gen 10 and we are looking at replacing the drives with 3 WD Red SA500 WDS400T1R0A 4TB SSD 2.5 inch SATA SSD Drive in a RAID 5 configuration. I have pasted the detail of the disk ...
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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 ...
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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 ...
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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 ...
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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 &...
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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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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 ...
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Bad docker (build) performance on encrypted mdadm RAID5 with XFS filesystem

We use a XFS filesystem on top of an mdadm RAID5 array on our server. The RAID iteself accesses the disk via LUKS mapper devides. The following sketch shows our setup: DISK1 -- LUKS -------| ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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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Having an issue expanding a raid 5 logical volume using adaptec maxview

As the title mentions, I cant seem to expand a logical volume using adaptec maxview . I have 3 8TB drives and purchased an additional one to expand the Raid 5 logical volume. I initialized the drive ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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RAID 5: Disk lost after boot

On Debian 9.12 RAID5 (md0) always is degraded after reboot. The array has three disks, sdb, sdc und sdd. sdd is always missing. The system boots to emergency mode. Here after "mdadm --run /dev/...
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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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Software RAID5 missing file-system; volume group. can data be recuse?

I try to recuse my 8TB raid5 in UBUNTU20.05. Below are what I have done: root@ubuntu:~# mdadm --detail /dev/md2 /dev/md2: Version : 1.2 Creation Time : Wed May 10 20:26:39 2017 ...
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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 ...
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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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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 ...
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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. ...
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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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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 ...
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extending a LVM partition > 2TB on Fedora 31 to use all unallocated disk space

We have a Dell R420 with the Perc H710 Mini that was configured with 3 1TB drives in a RAID 5. I added another 1TB drive and thanks to a little help from the Dell discussion board, the RAID 5 ...
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“Hot plug replacement too small” although disk is of same size

On one of our servers, a disk failed that was part of a RAID 5. I replaced that disk with one of identical size. However, the RAID does not start to rebuild. If I check the status of the disk with ...
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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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What a benefit of RAID 1,5,10 vs every night simple diff backup

Given: 2 HDD in RAID and case when we lose 1 of them after 3 years: If we use RAID 0, we lost data If we use RAID 1, we have a copy on possible also bad-health disk, any restore may cause failure ...
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Restoring RAID 5 with Windows 10 Storage Spaces

I'm configuring specification for PC that will be used as host for virtual machines. I planned to use 120 GB SSD drive for OS (Windows) and 3x1TB in RAID 5 for Virtual machine. I'm wondering if it's ...
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Server won't boot after adding two new disks

I have an HP ML350 G6 server with 3 600Gb SAS drives on RAID5. I added 2 new 1Tb disks and configured a new Array with RAID1. Al of a sudden I got the blue screen of death, the server rebooted and now ...
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Grow an mdadm RAID5 array with fewer, larger disks

I have a linux software RAID 5 array, made up of 5 x 3 TB drives, giving me roughly 12 TB in total. I want to replace the disks with newer 8 TB drives, but since these are still quite expensive, I ...
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Confusing RAID-5 numbers

raid-5 It's a mixture of 500GB x2 and a 320GB. (465, 465, 299.9 ish effective.) I've never done raid before but I tried to get as close to the pool capacity as I could. The disk space should be ...
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Drive allocation in a RAID 50 array on a HPE DL380 G9

I have a DL380 G9 with 12x8TB 3.5" disks: | 1 | 4 | 7 | 10 | | 2 | 5 | 8 | 11 | | 3 | 6 | 9 | 12 | In the Smart Array Controller GUI, if I select all 12 disks and assign them to a RAID 50 array, how ...
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Multiple RAIDS on same disks [closed]

On a server, I have 3 SATA disks. I'd like to create a root partition in RAID 1 of 50GB and a data partition in RAID 5 with the remaining spaces on my disks. There would be 2 different RAID types on ...
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Replace RAID 5 without losing system on a Dell r710 Perc6 Debian

I have a Dell r710 running Debian and just got it tuned to my use. It boots from a RAID 5 array of 4x300gb SAS drives. I have just converted some 600gb NetApp drives to 512 sector and they are ...
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632 views

Storage Spaces with Parity vs RAID 5 contoller without cache

RAID 5 has gotten some bad rep lately mainly because disks got so big and that in a rebuild case a bit failure on the remaining disks is likely. Nevertheless, I'm curious about something: I read that ...
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Data recovery from RAID5 volume managed by hardware controller

I am attempting to salvage as much data as possible off a failed 12 TB RAID-5 volume comprising 4 x Western Digital WD4000FYYZ 4TB hard drives in an OWC RAID enclosure that is based on the Oxford ...
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HP Proliant DL360p gen8 Unrecoverable Media Error. Amber lights on 3 disks

I have HP Proliant DL360p gen8. 4 disk on RAID 5, 3 of them have amber light on them. I did chkdsk on my virtual machines none reported any error. Am i able to fix it without buying and replacing ...
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Swap failing drive on ProLiant with P410

On an old HP SE316M1R2 (Same machine as the much more common ProLiant DL 160 G6) I have a 4x450GB Raid 5 array handled by the stock P410 Smart Array controller, fw ver. 8.40.30.00. Drives are genuine ...

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