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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3answers
4k views

How to monitor and rebuild hardware RAID in ESXi?

I'm currently putting together some ideas for a new VMHost using ESXi with RAID 5 to replace 3 aging ESXi hosts that have no RAID. However I can't seem to find any good info explaining how to monitor ...
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20 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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0answers
57 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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8answers
34k views

RAID-5: Two disks failed simultaneously?

We have a Dell PowerEdge T410 server running CentOS, with a RAID-5 array containing 5 Seagate Barracuda 3 TB SATA disks. Yesterday the system crashed (I don't know how exactly and I don't have any ...
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3answers
548 views

PERC H310 Raid 5 - Fault - Turn array into RAID 0

Yesterday one of the three Raid 5 disks I have configured into my DELL Server PERC H310 controller cannot be found anymore. I cannot replace the faulty driver now, so the thing I actually would like ...
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24 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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1answer
59 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 ...
2
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4answers
2k 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 ...
3
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2answers
293 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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1answer
40 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 ...
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2answers
105 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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1answer
38 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
79 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, ...
2
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2answers
120 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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0answers
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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3answers
2k views

mdadm raid5 too slow when writing

I have set up a RAID5 array using 4 disk partition. All disks are 2TB. When the RAID5 array was initially syncing it was too slow. So I did a echo 32768 > /sys/block/md2/md/stripe_cache_size and ...
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0answers
17 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
48 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
70 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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0answers
27 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 ...
2
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2answers
139 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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0answers
41 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 ...
34
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5answers
17k views

Recover RAID 5 data after created new array instead of re-using

Folks please help - I am a newb with a major headache at hand (perfect storm situation). I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto ...
5
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3answers
973 views

ZFS, raidz1: Why is the volume size (42T) so much smaller than the pool size (50T)?

I have a pool of 28 2TB-disks (56T) in 4 arrays of 7 disks. Since it's raidz1 (~RAID5), I'd expect 1 disk to be used for parity in each array, so the resulting volume should be 2TB*4*(7-1)=48TB, right?...
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1answer
38 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 ...
0
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1answer
32 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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1answer
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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0answers
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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0answers
83 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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1answer
58 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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1answer
46 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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3answers
244 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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0answers
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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2answers
266 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 ...
6
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2answers
2k views

Reusing Raid 5 Drive?

We have two servers (ML530 G2 and DL380G2) w/ identical HP 10K RPM SCSI drives w/ a raid 5. One is decommissioned and the other will be decommissioned shortly. However, one of the drives on the ...
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2answers
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 ...
0
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2answers
3k views

QNAP TS-859U+ RAID5 volume unmounted, e2fsck_64 hangs

We got this QNAP TS-859U+ with firmware version 3.8.1 Build 20121205 at our datacenter. It has Intel(R) Atom(TM) CPU D525 @ 1.80GHz processor and 1GB RAM, 8 of 3TB (Seagate ST33000651AS CC44) drives ...
3
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3answers
1k views

Terminal Server disk performance

Our users experience slow session performance at times during normal work hours. Applications (IE, Office Apps etc.) are slow to respond so is switching between them. This problem happens sporadically ...
2
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1answer
660 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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0answers
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
26 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
74 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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1answer
118 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 ...
15
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3answers
6k views

mdadm raid5 recover double disk failure - with a twist (drive order)

Let me acknowledge first off that I have made mistakes, and that I have a backup for most but not all of the data on this RAID. I still have hope of recovering the rest of the data. I don't have the ...
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0answers
84 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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1answer
2k views

Cannot reactivate RAID-5 volume: The size of the plex member is invalid

We had a 3-drive Windows Server 2008 R2 RAID-5 fail (operating in redundancy mode): WDC 1 TB WDC 1 TB WDC 1 TB We removed the failed hard drive, and put a WDC 1 TB drive (that we had standing by) ...
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0answers
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 ...