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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How can I rebuild a 4x146Gb Raid5 in a Proliant DL380 G3?

I have a HP Proliant DL380 G3 with 2 volumes (2 disks in Mirroring + 4 disks RAID5). One RAID1 disk failed and RAID1 has failed. The problem is that the machine has lost second volume. Now, I replaced ...
1
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0answers
29 views

Raid fault - Dell PowerEdge T11 II

The server is Dell PowerEdge T11 II PERC S100 Virtual Disk Management (Build: 2.0.0-0162) Disk 0 is set too Offline and gives message NOT SELECTABLE: Read error: There is small sound coming ...
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0answers
44 views

3Ware 9650SE-12ML with BBU very slow performance

Maybe someone can help with this issue... but I am getting HORRIBLE performace on a 5 disk Seagate Barracuda 7200RPM drives in a RAID5 setting. # tw_cli /c0 show Unit UnitType Status ...
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2answers
168 views

replacing 3 drives out of 8 in a server [closed]

We have a Dell R510 server running SQL 2008 R2 with 8 x 300GB drives running Raid 5. We (just noticed) we had three bad drives with blinking lights so we powered down the server and replaced them ...
0
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1answer
32 views

Why is Win Server 2012 slow to read data with RAID 5?

We have new HP 350p server with 4x 900GB 10k SAS disks with RAID 5 (win server 2012). But disks performance to read data is to slow - it's to slow to read big directory structure on disk. Where can be ...
3
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2answers
105 views

Software RAID 10 not any faster than s/w RAID 5 on Ubuntu 14.04 box, why?

We are doing some tests on a new database server with 4 x 240 GB SSD disks. From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy. However when ...
0
votes
1answer
110 views

How to solve performance problems with VMware ESXi 5.5 on old Dell PowerEdge 2900 hardware [closed]

I have a couple of old Dell PowerEdge 2900 servers that have come free and I would like to use them to host a mail server cluster. They are a bit old, but have been running workhorses for a while, ...
0
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0answers
50 views

Sata RAID5 Orphan Drive

so today, one of our hadware RAID5-controllers (Sil3124 (r5), 4x 2TB) went into degraded / legacy mode without any notifications. Additionally, automatically rebuilding the raid-group failed: Event ...
0
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0answers
39 views

LVM fault tolerance and recovery over 2 mdraid RAID5 arrays PVs

I have an Ubuntu 14.04 LTS server with an mdraid RAID5 array and LVM on top, meaning one PV and one VG using it. The LVM is configured to allocate all the space to one LV. The LV is formatted with an ...
0
votes
1answer
38 views

Analyze SMART self-test for broken disks [closed]

I recently came home from vacation only to wake up the following morgon with two disks in my RAID5 array marked as faulty. I was able to start the RAID by forcing it to use the faulty disks and run, ...
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1answer
39 views

Removing HDD from RAID 5 to pull data from

I have a relatively (I think) simple question... I have a file server with RAID 5 that is old and pretty much dead and I need to grab the data from it. I was thinking I could pull one of the HDD's ...
2
votes
1answer
241 views

RAID5 array Ready for Rebuild

I've inherited administration of a server with a RAID 5 array. We have a damaged database on the array that is just over half the allocated size, so makes recovery impossible. I recently changed the ...
0
votes
0answers
68 views

Low disk I/O causing high disk busy and CPU wait

I have an Ubuntu 10.04 server on VMware that is experiencing 99% disk busy with only 1 MB of disk I/O according to nmon. 300 KB of disk I/O causes 25% to 30% disk busy. iostat reports the same: ...
0
votes
1answer
103 views

Windows 2008 R2 server software RAID-5

After one of the reboots (normal one after windows update) Windows 2008 R2 marks software RAID-5 disks (OS-Based) as "Invalid". RAID structure is intact - I can see it via R-STUDIO. All data are OK ...
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2answers
74 views

Can a RAID5 be corrupted if Drive 0 has been failed and how could this be fixed? [closed]

I have configured RAID5 on an ASUS server and installed VMware ESXi 4.1 on it. The attached photo indicates that Drive 0 resides in a Failed state. All Hard Disk Drives (HDDs) are running Normal. ...
1
vote
2answers
185 views

How can you force linux software raid not to disable a disk for recovery?

I'm trying to recover data from a RAID5 array. 2 of my 4 disks unexpectedly failed at the same time. I am able to start the array by forcing it. mdadm --assemble --scan --force The array starts up ...
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votes
1answer
45 views

Can I pull raid 5 disk from IBM X365 to put into another X365

I have an IBM X365 that is sitting in a corner. It has the same size drives as the IBM X365 that has a failed drive. Both have Raid 5. Can I pull drive from the one sitting in the corner and ...
1
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1answer
43 views

Optimize unused space in RAID5 due to bigger HDD in spare parts change

I have started with 3x250 GB SATA array, but the old HDDs failed one by one and when the spare parts came they where bigger disk inside and I recently ended up with 3 HDDs of 500 GB. I see ...
2
votes
1answer
42 views

Raid 5 URE rate [duplicate]

I've recently read this post: http://www.standalone-sysadmin.com/blog/2012/08/i-come-not-to-praise-raid-5/ tldr; It basically says that the error rate of a RAID system is tied to the hardware, and ...
16
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8answers
8k 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 ...
0
votes
1answer
78 views

When exactly does a RAID5 reconstruction happen?

Let's assume the following scenario: A RAID5 array consisting of 3 disks is happy and running One of the disks crashes We replace the broken disk with a spare one The system is up and running again ...
3
votes
1answer
45 views

Reading /proc/mdstat

I just built my first raid5 yesterday (with 4 hds) and was reading about monitoring with /proc/mdstat. My understanding is an ideal dispaly with 4 drives should be [UUUU] however mine reads [UUU_]. ...
5
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4answers
3k views

How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I'm looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, ...
0
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0answers
71 views

Server 2012: Should I use Cached Exchange Mode with Terminal Server?

The setup is a (all brand new) single physical Dell server, with 32GB RAM, running Server 2012. This has a single 3-disk RAID 5 array (DELL PERC) mapped to 3 volumes in Windows. They are SAS disks. ...
1
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1answer
317 views

DELL PowerEdge 2950 stuck on BIOS

My DELL PowerEdge 2950 is Stuck on BIOS 2.7 screen and does not advance at all, keyboard is not responding either. How should I troubleshoot this issue? Here is the screen
0
votes
1answer
40 views

Is it possible to install OS during RAID scrubbing?

One of our servers crashed a few days ago. I had to recreate the RAID container with the remaining disks. Currently the system is running the scrubbing process (screenshot below). I would like to know ...
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votes
1answer
816 views

Repair HP SmartArray p410i

i have an HP proliant server and in the last 4 years i never had a single problem with it. but yesterday i found out that i cant remotely login to my server so i went over and found that one of three ...
0
votes
1answer
773 views

Dell PowerEdge R720 - Corrupted RAID

Apologies in advance for the lengthy question. We have a Dell PowerEdge R720 server with: 2 x 136GB SAS drives in RAID 1 for the OS (Ubuntu Server 12.04) 6 x 3TB SATA drives in RAID 5 for data A ...
4
votes
2answers
352 views

What steps should I take to best attempt to recover a failed software raid5 setup?

My raid has failed, and I'm not sure what the best steps to take are in order to best attempt to recover it. I've got 4 drives in a raid5 configuration. It seems as if one has failed (sde1), but md ...
10
votes
3answers
1k views

Recover from a Punctured RAID array

here is my situation. I have a Dell Server with a Dell Perc 7i controller, (LSI Controller). I had a drive give me an Failure Predicted warning so I called their support and they came out and ...
1
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3answers
91 views

4 Disk - RAID(5) - 1 alleged faulty drive

I have a OWC Mercury Pro Elite Qx2. I have 4 4TB Hitachi drives setup on a RAID 5. One day, the red light came on indicating that my C drive has failed. I took it out, and put it on my docking ...
1
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1answer
94 views

LSI Raid 5 with 2 disks “not synced”

I have a system with a LSI 1064e SAS raid. The system is not booting, and when I enter the raid configuration utility, It says, that has 2 disc "Not synced". I didn't find the option to resync them, ...
0
votes
2answers
66 views

Raid 5-Disk Faulty [closed]

I have the following Raid-5 Configuration with one disk faulty. http://i62.tinypic.com/2z6rxck.png I need to do a swap out. Not sure with the current configuration if it will affect the other disks, ...
3
votes
1answer
41 views

Raid 5 on two scsi buses with different maximum speeds

I'm quite a noob, I'm trying to set up as a study machine an old HP ProLiant DL385 G1. I've configured a RAID 5 out of six SCSI 3.5" HDDs using: - Smart Array 6i controller; - (4 x SCSI Ultra320 ...
2
votes
1answer
258 views

Large write with dd fail on RAID-5

I have a server with a RAID controller which connects to a JBOD over SAS. JBOD is populated with 16 SAS-HDDs of 3TB (8 of one make and 8 of other, same rpm). I have configured 3 logical drives with ...
2
votes
1answer
123 views

Removing all disks from RAID5 and adding new disk for access/data destruction - will RAID be preserved?

We have a RAID5 array and limited resources. It has been suggested, for data destruction of a SAS drive with a bad sector, to remove ALL drives from the RAID5 array, and then place this 1 drive into ...
10
votes
2answers
842 views

What counts as a 'large' raid 5 array?

A recent issue with a Buffalo TeraStation NAS here in my office has got me investigating Raid 5. I've found a few different articles talking about the unsuitability of using raid 5 in large arrays, ...
0
votes
2answers
42 views

Migrate unix-system to hardware RAID-5 possible?

At the moment, I have a Intel SR2500 with 5 disks running at home. 4 of the disks aren't used at the moment due to maintenance-reasons. Because it's an expeiment-laboratory-machine where I can try ...
3
votes
1answer
121 views

how to determine which drive belongs to which slot on raid 5

i have an HP DL380 G8 machine with 4 hard drives of same size and running on raid 5. unfortunately during a service process of our data center one of the junior team members pulled out all four hard ...
1
vote
1answer
61 views

Raid 5 verifying

Good day every one, i all ready read this RAID 5 detects write errors? I have raid 5 on "3 ware" controller i want to ask: - do i need run from time to time verify schedule or i can use only ...
1
vote
1answer
899 views

logical drives on HP Smart Array P800 not recognized after rebooting

We had a Smart Array P800 configuration working fine (RAID5). Physically, we have a disk enclosure (like this) connected with a Linux Server. Here is what happened: This server was accidentally ...
2
votes
2answers
352 views

Linux software-RAID4/RAID5 and CPU usage

In case of RAID4 or RAID5, for each stripe of data bits, a parity bit is stored. For example if I write 0 to drive A and 1 to drive B, then parity bit 1 is stored to drive C. Isn't this a huge load to ...
0
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2answers
223 views

Is mdadm RAID Toast?

I took all my drives out and put them onto a new cpu/mobo. (upgrading) I boot up and mdadm claims it can't boot my degraded RAID. /dev/sdb sudo mdadm --examine /dev/sdb /dev/sdb: ...
2
votes
1answer
53 views

2 disk RAID5 Linux software array

(I've posted this on Serverfault as I suspect it a bit to technical for Superuser. If I'm wrong please move it where appropriate) I am remotely looking at a device which identifies as ReadyNAS ...
0
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0answers
97 views

dmraid lists disk as “spare”, even though it was part of the array

It was setup as a RAID5, 4 disk array of /dev/sdc -> /dev/sdf. sdf failed, leaving the array in a degraded but operational state. A misguided attempt to restore the array led to one of the working ...
2
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0answers
101 views

Why don't enterprise RAID controllers support migration from RAID 5 to RAID 10?

I've been doing some research on the possibility of live migration from RAID 5 to RAID 10 and I'm curious as to why it seems that most RAID controllers (particularly Dell's PERC controllers) don't ...
1
vote
1answer
116 views

Recovering Linux soft raid 5, disk stays as spare

I got disk failure on my Centos Linux soft raid 5 array (mdadm). I replaced one of the disk and started to rebuild the array. Next time I checked the status, the rebuild was failed. This is the ...
0
votes
0answers
25 views

Expanding a RAID 5 array on Adaptec

Ive got a RAID 5 array setup on an Adaptec 7805. The current array is setup on conn 1 (4 disks). And ive added a new disk to conn 0. All same capacity and type. How can I expand the array on ...
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1answer
39 views

Raid5 status is checking means?

I noticed the following messages on my system: Personalities : [raid1] [raid6] [raid5] [raid4] Md3 : active raid5 sda5[0] sdc5[3] sdb5[1] 3858519040 blocks super 1.2 level 5, 512k chunk, ...
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votes
2answers
159 views

Deleting Intel RAID 5 Volume Without Losing Data [closed]

I wish to stop using RAID 5 and return to a series of individual drives. How can I do this without losing the data? I'm using intel rapid storage technology