RAID, an acronym for Redundant Array of Independent Disks (sometimes incorrectly referred to as Redundant Array of Inexpensive Disks), is a technology that provides increased storage functions and reliability through redundancy. -Wikipedia

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Ibm V3700 SAN / Howto add additional disks in existing pool

We have IBM v3700 San Storage(300gb x 36 SAS HDD) connected to Four servers (windows 2008) via FC. Each server have few disks allocated in RAID5 mode. There are 8 unused (candidate) disks available ...
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1answer
19 views

A DegradedArray event had been detected [on hold]

at morning cPanel send me this email This is an automatically generated mail message from mdadm running on A DegradedArray event had been detected on md device /dev/md/1. Faithfully yours, ...
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3answers
4k views

How to test disk latency on Linux?

Made an upgrade of RAID firmware and latency as it seems have increased. Could you please advise on the most accurate way to examine disk read and write latencies?
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1answer
27 views

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
45 views

Replace faulty drive in Raid 10 using smaller drive?

I have a Raid 10 array with a faulty drive in a Qnap TS-809. The array contains the following drives: (I know it was a stupid idea to mix the drives in the first place) 1. 2TB WD Red --\ 2. 2TB WD ...
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3answers
6k views

RAID-6: better to replace two dead drives at the same time, or one at a time?

We have a 16-drive RAID-6 that has three problem drives. Two are already dead, and the third is giving SMART warnings. (Nevermind how it got in such a bad state.) Obviously we want to replace the ...
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2answers
64 views

No Filesystem after deleting RAID

So I had the /home partition in two disks in RAID1, one disk failed so the system booted with lots of errors about that. I didn't have another disk to replace the one that failed, so I wanted to ...
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1answer
1k views

HP P410 “Parity Initialization Status: Initialization Failed” How to fix?

I'm using HP P410 raid card with BBU with 12 x 3TB drives on RAID50 After a power outage at the datacenter, the hpacucli shows this: Parity Initialization Status: Initialization Failed However, all ...
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1answer
23 views

How to stop Ubuntu keeping writing degraded RAID

I have a hardware RAID (Adaptec 5805, RAID 6 of eight 6TB drives) that recently constantly fails when I have lots of disk writes. I installed Ubuntu on a separate disk and the Ubuntu seems not able to ...
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6answers
12k views

Poor read performance on Dell Perc H200 RAID10 with (4) 1TB 7200rpm 64MB drives

I am seeing only 50MB/s reads: ensnare@box:~$ sudo hdparm -tT /dev/sda [sudo] password for ensnare: /dev/sda: Timing cached reads: 4592 MB in 2.00 seconds = 2296.48 MB/sec Timing buffered disk ...
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2answers
2k views

LSI Megaraid alarm - clearing hotspare

I have several Supermicro servers with LSI Megaraid controllers, 9266-8i. One recently lost a drive; I replaced it as usual, but it is still beeping on reboot. It is set up as RAID 10 + hotspare. ...
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5answers
15k views

Software RAID underneath ESXi datastore

I'm building an virtual environment for a small business. It is based around a single ESXi 5.1 host, which will host half a dozen or so VMs. I'm having some doubts regarding how to implement the ...
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1answer
1k views

IBM System x3650 M3 - how to expand RAID 10 array

I have RAID 10 array on my IBM System x3650 M3 server - four drives IBM 146GB 10K 6Gbps SAS 2.5". I bought four new drives (also 146GB 10K 6Gbps) because soon I may have problem with free space. Can ...
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0answers
11 views

ZFS messed mirrors up [migrated]

I have a ZFS pool with 6 drives in RAID10, well it use to... I tried to upgrade a 146GB drive to 1TB drive, and messed up bad root@x7550:~# zpool status pool: stuffpool state: ONLINE scan: ...
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4answers
5k views

How to create Raid 10 with megacli

I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in ...
4
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1answer
2k views

mdadm: hot remove failed for…

My RAID1 is degraded and I need to replace /dev/sdb. However, I could mark /dev/sdb5 (in /dev/md1) as failed and removed it, but I can't do the same with /dev/sdb1 (/dev/md0 which is mounted on /): ...
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1answer
31 views

Performance comparison of single RAID vs multiple filesystems

I'm trying to get maximum sequential disk throughput for an application on my Linux server. It has 7 SATA disks that I could put in one RAID0 or RAID5 using a hardware RAID controller (HP P420i). Or, ...
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3answers
896 views

SATA drive problems with two SIL RAID cards

I've just put a second SiI 3114 SATARaid card in my home server so that I could add another pair of SATA drives and increase my storage space. Annoyingly, it doesn't seem to work: [ 32.816030] ...
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1answer
45 views

Dell PowerEdge R720 not recognizing RAID card

We recently bought a PowerVault MD3420 and I sent Dell the specs of the server I was going to use to connect it to. They sent me a card made by LSI instead of a PERC card for controlling the RAID ...
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1answer
1k views

Kernel panic after boot Centos 6.5 HP DL320 B120i HPVSA

Im working with a new HPDL320 micro server (gen8-2) with a HP Dynamic array B120i My problem is after the setup. I provided the DiskDrive to the installer and everything is fine. at first i used kick ...
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1answer
18 views

LVM volumes not found.. Aggressive recovery methods?

Our system experienced a hard reboot, and when it came up, we started getting panics. The boot mount was on an LVM volume. We recovered the GPT partition but all of the LVM commands that I have run ...
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2answers
801 views

How to clone a RAID5 system

I clone single disk systems by booting the master system to a CD and running… dd if=/dev/sda | gzip - | ssh user@hostname dd of=image.gz Then I boot the target system with the CD and run… ssh user@...
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4answers
2k views

Monitoring PERC 6/i in vMware ESXi 5.5

I currently have a Dell Poweredge 2950 running ESXi 5.5. My datastore is four drives in RAID 5 configured in the PERC 6/i config utility on bootup. My question is, what do I do if/when one of these ...
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2answers
4k views

SBS 2003 boot stalls at acpitabl.dat

I have a SBS 2003 server running for 3 year without any problems, and few days ago it freezes during the boot. System is using two 500 Gb drives in RAID1 (Intel Matrix 7.5) After trying to load in ...
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3answers
203 views

If RAID5/6 are risky due to URE, are full backup/restore schemes at risk too?

As I understand it, you have a high chance of encountering an URE during a rebuild due to having to read a large amount of data to perform the task. Does this problem also affect backup and restore ...
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2answers
40 views

RAID can't rebuild Rebuild offen missing HDD

First i would likes to say the raid configurations of my server. Intel RAID 10(4*1TB HDD) two from wd, 1 from hitachi, 1 from seagate + 1 seagate as hot spare Here goes the problem the last hdd ...
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2answers
1k views

How do you repair a Ubuntu 14.04 RAID-LVM-DM-CRYPT-LUKS Physical to Virtual system that won't boot?

I can't get a Ubuntu 14.04 Virtual server to boot correctly. It's recently been cloned "dd if=/dev/sda of=vmimage" The Physical has a RAID1-LVM-DMCRYPT-LUKS configuration, The boot sequence aborts and ...
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1answer
1k views

LSI RAID not synchronizing

There is a HS22 Blade with RAID. I removed one of the mirrored disk, and used it for other, but now I'm inserting it back, but it doesn't sync from the working disk. cfggen shows the following: ...
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0answers
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
24 views

Recovering a RAID5

Hoping somebody here can help, as I'm a bit stuck on what to try next. Essentially, I had a RAID5 of 4 disks in mdadm. One of the disks started failing, not enough to have mdadm eject it, but enough ...
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1answer
21 views

RAID geometry parameters for XFS on top of LVM

I need to set up an XFS filesystem on top of LVM on top of a hardware RAID-6 (10x 6TB + 2 parity) and I found the guideline on http://xfs.org/index.php/XFS_FAQ ("How to calculate the correct sunit,...
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1answer
1k views

Resize openSUSE 12.3 GPT ext4 partitions in a RAID1 disk array

I have a software raid configured (/dev/md2) which has assigned the partitions sda3 and sdb3 from two 3TB disks (sda and sdb). The partition types are GPT not LVM and file system is ext4. Now, the ...
2
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2answers
135 views

Can't get my RAID array out of degraded mode

I've got a 4-drive RAID 10 array that has just had a drive failure. I ignorantly have never practiced how to recover from a failure (I'm a programmer, just keeping this server as a hobbyist) so I'm ...
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0answers
30 views

small client-server app & db install location

We're running Server 2008 R2 on dual 2.8 GHz processors with 32 GB memory and a partitioned 1 TB, 3-disc RAID. Seems plenty robust for our purposes. Our primary application, however, has been lagging ...
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2answers
191 views

Dell Power Edge 2950 SAS RAID configuration

I have been given a Dell Power Edge 2950 by the company I do service work for to use as a backup server. When I first got it there was a message saying "PCIe Training Error Slot 1". I managed to get ...
0
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1answer
27 views

Dell PERC RAID array how to ignore error

We have a Dell PowerEdge R720 with a PERC H710 Raid Array. It is configured into two disk groups, disk Group 0 which has the OS and the data, and Disk Group 1 which for reasons unknown to me is ...
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1answer
16 views

Lights not working on HP msa 2040 [closed]

I have HP MSA 2040, it has total of 12 disks 3 of the disk lights are off. How to check the issue? Or are they off due to any configuration or raid? Another question how to check what raid is ...
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1answer
49 views

Why does my HP Smart Array show two logical drives as failed?

I have HP Proliant DL 380 G8 with raid 0+1 ..still its not booting in smart array controller showing 2 logical drive is failed how can we fix it
2
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0answers
32 views

btrfs increase raid capacity by replacing disks (and not adding disks!)

I'm very excited about the new features of btrfs and would like to start tesing it. Before I get started, I would like to ask if btrfs supports increasing raid capacity by replacing disks by bigger ...
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0answers
28 views

How can I install and run the Raid tool 'tw_cli' on server that running Centos 7?

I need to check the Raid status in my server and I was told that the tool 'tw_cli' is doing that. I tried to install it but the command line 'tw_cli' still doesn't work. What I did is : wget http://...
2
votes
6answers
7k views

Ubuntu installation can't detect hard drives

I'm installing Ubuntu onto a HP Proliant DL360 G7 server, which has a hardware Smart Array RAID controller that is not compatible with Ubuntu. HP say the RAID controller needs to be disabled in the ...
1
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5answers
4k views

How to check if my hard-drive are on RAID5 or RAID6? - Windows Server

I'm not sure if a server I own has been setup on RAID or not. Is there any way to check this within Windows, rather than relying on what the company support tells me? Any ideas? :)
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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 ...
20
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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 ...
4
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1answer
2k views

Cannot install grub, segmentation fault, unable to identify filesystem, superfluous RAID member, found two disks with same index — Debian 7

A server was recently transported from location A to B, a long journey that took six months. Things have gone wrong due to nothing being labeled prior to shipment. Yes, I know --- it was done by ...
0
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1answer
21 views

recover original file system from raid6 iso's

I started with 5 drives. 1 has failed (i.e. fails to communicate anything) and 2 more are returning read errors. My plan is to use ddrescue to store the 4 working drives to iso files. After this I ...
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0answers
44 views

Connecting two mini-SAS SFF-8087 together

I was wondering if it is possible to connect two SFF-8087 ends together. I have two mini-SAS cables in my server. The server is from HP and both cables are from the local HP reseller. One SAS cable ...
3
votes
1answer
93 views

DL160 gen9 P440 SAS cable

We recently bought a new HP Smart Array P440 RAID controller from the local HP reseller store for our HP DL160 gen9 server. (P/N: 783361-425) We want to run ESXi on the server, with three virtual ...
0
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1answer
31 views

max data transfer rate on RAID array

1) Let's say I have an array of twelve disc drives in a RAID-1 formation. That's effectively six drives presented for use. What's the maximum read rate I should be able to get out of that array? ...
2
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2answers
92 views

How can SSD write performance be dramatically different on two identical servers?

I am renting two identical physical servers (at Serverloft). These servers come with 2x512 GB SSD disks, and I've set them up with mdadm in a RAID1. The disks are locally installed in the server. The ...