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 ...

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What are the consequences of a hot-spare dying during an array rebuild?

We've experienced a failure of the hot-spare during reconstruction of a failed disk in a RAID5 array. As it seems, we actually lost some data over this, at least the storage bay is giving I/O read ...
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25 views

LSI megaRAID failed drive ID: 0xa - which drive is that?

I have two failed drives in a RAID5 array (yeah, I know), and I'm trying to find which one failed last so I can know which one to attempt to recover since it has the current stripe. My LSI MegaRAID ...
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69 views

XenServer 6.2 - could not find filesystem '/dev/root'

We have a Citrix Xenserver 6.2 install. Today we had an incident where power to the server was suddenly cut off from the server. It had been running for quite some time without issue. It has quite a ...
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2answers
34 views

Raid Drive Upgrades

I have a RAID 5 setup with 5 2TB drives. If I start to replace the 2TB with 4TB, once I have enough, can the Array be moved to 4TB's? I know that if I put a 4TB in a 2TB Raid, the 4TB will recognize ...
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27 views

3ware 9750-8i RAID5 Increase Raid Capacity by Replacing Disks

i did some research in the documentation of the 3ware Raidcontroller (LSI / Avago / Broadcom) 9750-8i regarding online capacity expansion. There is useful information in it about increasing the raid ...
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309 views

Optimizing storage of 10-20 million files on RAID5 (currently using LVM+XFS)

Although I've browsed some of the questions here, I think every situation is different and maybe requires a totally different solution. What I have now: Linux software RAID5 on 4x4TB enterprise HDD ...
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41 views

mdadm --grow power failure, /dev/md2 no longer detected, RAID5

Did a terrible stupid mistake. Please advise me how should I best proceed. My configuration is a RAID5 of 4x4TB drives. On top of it, LVM with various partitions including /, swap, everything. The ...
2
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1answer
77 views

ProxMox with PERC 5/i RAID 5

I recently set up a dell 2950 III with ProxMox. I attached an external hard disk that is used to boot ProxMox and I would like to use the RAID 5 array to store data such as images and disks. How would ...
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2answers
107 views

How to correctly create a filesystem on disks that are connected to a RAID disk?

I want to create a ext4 filesystem on sda, sdb, and sdc and mount them to use them but I don't know how to handle all the raid stuff. lsblk output: NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda ...
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39 views

Which raid array will be best practices with seven 1.2 tb hdd system

I have a server which have seven 1.2 tb hard disks. I have to create raid array but i don't decide which raid i use? First of all, first and most important matter is security. At any cost i must not ...
2
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1answer
82 views

zfs convert linear to raidz5 or rebuild

Can i convert my linear span to a raidz-5? I finally have enough hard drives, and dont really want to thrash them about refilling with the backup data that they need to be holding. so currently, ...
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2answers
136 views

Expanding a RAID 5 partitions on Dell T610 with PERC 6 with Windows 2008 R2

Here is my dilemma fellas, I have a Dell Poweredge T610 with a PERC 6 RAID controller running on Windows Server 2008 R2. OLD configuration: 3 x 1 TB SAS Drives in RAID 5 configuration I ...
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17 views

Expand RAID 5 (Adaptec 6405 Controller with three 1TB western digital velociraptor disks) with 2TB Seagate NAS disk(s) - speed?

Dear ServerFault Community :) I need to expand the setting described in the question. Since the disks that have been used when the RAID was set up are unreasonably expensive (western digital ...
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19 views

Clone RAID5 from one controller to another?

i have a question concerning cloning a Raid5. System: HP ML350 with a RAID controller, 2 Bays. Bay 1 Raid5 3x2TB Bay 2 RAID5 3x600 SAS The 3 SAS Disks in Bay 2 need to be swapped, it is predicted ...
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2answers
60 views

RAID5 recreate without loosing data or recovery [closed]

I have problem with RAID5 failed. Intel Matrix Storage on Asus motherboard The configuration was - 500 GB NON RAID (System C partition) - 1 TB - RAID 5 with 3 hard drive (System D partition) Main ...
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2answers
83 views

Degraded md RAID5 won't boot

I'm running a Ubuntu server on a md RAID5. I started to have some issue with one disk, I received the following email from mdadm: A DegradedArray event had been detected on md device /dev/md/0. md0 : ...
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29 views

Cannot restore RAID 5 configuration

We have recently come across a problem and we would like your input on what is the best way to solve this. We have a QNAP TVS-871 and it was configured as a RAID 5 Storage Device. Today the system ...
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42 views

Right way to Migrate bootable Windows Server 2008 SP2 from RAID 5 Vdisk to RAID 0 or Single SATA and ensure Booting?

Did the following 2 identical blank 1 TB SATA drives: Cloned the RAID5 Virtual disk to RAID 0 Drive on Controller Cloned the RAID5 Virtual disk to SATA Drive on Motherboard SATA Port Using ...
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2answers
161 views

Failed Dell PowerEdge T410: Move Hardware RAID PERC H700: 3 x 300GB SAS (1 faulty) to 2nd T410 for Disk Cloning & Boot

Failed Dell PowerEdge T410: Move Hardware RAID PERC H700: 3 x 300GB SAS (1 faulty) to 2nd T410 for Disk Cloning & Boot FYI - PRE QUESTION CONTEXT: We barely got the original T410 up once ...
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1answer
40 views

Replacing RAID Control Battery DELL PowerEdge 2950

My DELL OpenManage Server Administrator shows 'Battery on Controller PERC 5/i Integrated state as Failed'. I purchased the RAID Controller Battery. But, Will it remove my RAID-5 Configuration if I ...
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1answer
33 views

Why does a URE cause loss of array during RAID 5 rebuild?

From what I have read, RAID 5 is problematic with large disks becuase if a single disk fails, you are likely to have an unrecoverable read error while the array is being rebuilt. From what I can ...
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31 views

Raid Controller: Activating Write Back [closed]

We need to activate "write back"-mode on a raid controller in a storage server. Do i need to reinstall the operating system or rebuild the raid setup after activating write back? We can´t test it, ...
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28 views

Hot expand RAID5 unit on 3ware 9650se

Can I migrate a 5 disk RAID5 unit where the drives for that unit were each replaced one at a time with larger ones (2TB to 3TB)? I imagine the command would look something like this in my case. ...
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89 views

Synology DS1813+ RAID 5 with iSCSI IO wait perfomance issue

I'm have RAID 5 on Synology DS1813+ (DSM Version: DSM 5.0-4493 Update 4) with 8 ST4000DM000-1F2168 disk, usind as NAS and iSCSI/NFS targer for ESXi. In low read/write rate from disk have more io wait,...
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60 views

Setup SunFire 440 Raid Configuration

How can I setup Internal Hard disk RAID5 configuration? I have SunFire 440 machine with 4 internal hard disk. I have never worked on Sun systems except for now and I am exploring google for the above ...
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50 views

How to estimate the time taken by RAID rebuild?

I was being stupid and when smoke testing my storage server I forgot to plug in the power of one of its drives (D'oh!) Now I am stuck in rebuilding the RAID-5 array. (Thank god it is RAID-5 or I could ...
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40 views

3TB HD reduces to 752GB when converted from basic to dynamic

Our surveillance server running Windows2008r2 (standard), had a software RAID5 of five 1TB HDs. Ran well for 2 years, till one drive died last week. Decided to "upgrade" and increase room to five ...
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297 views

Dell PowerEdge T410 Raid 5 PERC S300 stuck on 0% while rebuilding

Edit: I upgraded Open Manage Server Administrator and now I receive the following message when I attempt to assign the new disk as a global hotspare: Caution Physical Disk 0:0:0: This ...
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1answer
17 views

Only notify when unreadable sectors increases

Is there a way to only be notified when the amount of unreadable sectors increases on a certain disk? The following warning/error was logged by the smartd daemon: Device: /dev/sdb [SAT], 4 Currently ...
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35 views

Does data get bottlenecked when copying from one server to another when the two servers have different RAID configurations?

Suppose Server 1 is configured with 8 1TB disks in RAID 5. Server 2 is configured with 8 1TB disks in RAID 0. There is a link between the two servers but for the purpose of this question, lets suppose ...
2
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1answer
775 views

HP Code 341 “Physical Drive State: Predictive failure. This physical drive is predicted to fail soon.”

this is my first post so bear with me here :-) Background: I have a RAID5 setup with 4 disks that have been working perfect for years. After one drive failed, I installed new drives which where ...
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16 views

Raid 1 and Raid 5 with Debian 8 Install [duplicate]

Ive been advised that i should install Debian 8 using the following raid configuration: Raid 1 (2 discs) - for OS Raid 5 (4 discs) for data. This way, i can have 2 disc failures and still have a ...
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0answers
29 views

M5015 Disk controller - Replace failed disk used working disk

I have an IBM X3200 M3 machine with a M5015 SATA Disk controller (RAID 5). One of the disks has failed ie orange light flashing on the disk. I intend to replace the damaged disk with a used disk of ...
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1answer
80 views

RAID 6 >80% Highest Active Time with small I/O

I have a RAID 6 with 18 disks. It is used as a storage for small images(5-500Kb). It is about 6TB full of data. I have an utility that reads that images to the ram and then send it over network. I ...
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4answers
3k views

Slow write Performance with HP H240 HBA using internal Storage with Raid 5 SSD's

I am having a HP Proliant DL 160 Gen9 Server with a HP H240 Host Bus Adapter. 6x 1 TB Samsung SSD's configured in a raid 5 directly using the internal storage of the machine. After installing a VM on ...
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85 views

RAID 5 keeps failing after recovery

I have configured a raid 5 with 6x2TB devices with mdadm (I shrinked it from 9 devices to 6): /dev/md0: Version : 1.2 Creation Time : Mon Sep 23 17:54:25 2013 Raid Level : raid5 Array ...
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17 views

Resetting a raid 5 array on an hpproliont ml350 g6 server or find the original drive order

The data on the array is not important I just need the array back online I took out the drives and didn't order them correctly I'm an idiot I know is their a way to eat her reset the pattern or dins ...
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1answer
38 views

RAID 5 failure Ubutnu 12.04 not rebooting

I have Ubuntu 12.04 setup with software RAID 5. Dmesg started to show I/O errors continuously. I thought to reboot the system and lo and behold, it got stuck on GRUB ERROR Loading 21 I then used ...
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1answer
107 views

Safe and beneficial to enable HD disk cache for disks in RAID, or not?

Dell Perc RAID cards (among others) allow you to set the disk cache policy to be either on (meaning, the individual hard disks use their built-in caches) or off (meaning, the individual disk caches ...
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126 views

Dell PowerEdge T410 - How do I build additional 3 drive Raid 5 and keep SBS 2011 running?

Dell PowerEdge T410 / Dell PERC 6/i 3 x 1TB SATA in Raid 5 array split as 2 drives (Drive 0  C: 128GB E:1847GB) (Drive 1  D: 20GB) Currently running SBS 2011 Standard. I would just ...
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3answers
178 views

how to detect hard disk failure in custom server

We have a custom server with following details: Motherboard Supermicro X8DTL-3 Raid Controller HP Smart array p400(512G BBWC) HDD Backplane Supermicro SAS825TQ 3 Seagate Barracuda HDD with 1TB(Raid ...
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2answers
140 views

Replace Raid 5 HDD with a non empty HDD

Is it safe to replace a corrupt HDD (HDD-A) inside a Raid 5 array (enterprise class hardware) with an almost full disk which contains almost the same data as the corrupt disk (HDD-B)? Will the new ...
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3answers
254 views

HP Proliant - RAID 5 array recovery

I searched but found no solution to this question. I have a HP ProLiant DL385-G5p server with RAID 5, having 4 hard drives: 3*75GB + 1*75GB spare. One of the 3 hard disks in RAID5 has failed (the ...
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1answer
86 views

Best RAID level for NAS [closed]

I just bought my first computer that I'm going to run as a NAS with OpenMediaVault as OS. I bought two HDD (WD red 5400 rpm) with the capacity of 3TB each (and one 120GB SSD that I'm going to run the ...
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52 views

software 4x4tb raid 5 win 2008 r2 to 2012, server down

I have a server fujitsu econel 100 with 4x4tb in raid 5 configuration (software based with windows server 2008 r2) now the server is down (PSU and motherboard KO) and I will buy a new machine to ...
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1answer
59 views

Is it possible to recover a RAID 5 in this case?

Is it possible to recover a RAID 5? After losing the "/proc/mdstat" and run by mistake "mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1" instead of ...
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2answers
306 views

Strange data corruption in Windows Server 2012 R2

I've got a server running Windows Server 2012 R2, OS is in RAID 0 (2x WD Black 500 GB), Data is in RAID 5 (4x WD Red 1 TB) and primarily holds thousands of documents. Since the past week or so we've ...
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128 views

zfsonlinux, raidz1: two disk corruptions: How I can use dd/dd_rescue and deceive zpool?

I have zfsonlinux (Centos 7), and raidz1. And I have trouble: two disks are dying. The first disk have Raw_Read_Error_Rate failure in SMART and Reallocated_Sector_Ct error (the disk has run out of ...
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2answers
164 views

HD crashed in Synology DS411+ (RAID5)

Today I got notified by email as one HD (out of 4 identical 2TB HDs) in my Synology NAS was "disconnected". I don't have any physical access to the NAS at the moment, but tomorrow someone will replace ...
2
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1answer
161 views

Replacing a Self encrypting Hard Drive in an IBM xseries server raid

I have a failed drive in a RAID 5 array in an IBM x3650, Machine Type 7945. The RAID is composed entirely of original IBM SED SAS drives, 300GB ea. Unfortunately I am the purchasing Tech, not the ...