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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Must a disk be formatted everytime it is removed and reinserted into a raid5 server?

I'm very new to RAID servers, in fact I'm new to any kind of server management, so please forgive me if this question is badly phrased. I'm considering buying a RAID5 server with four 4TB drives. I ...
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2answers
750 views

Proliant Server E200i Raid Controller does not see array

Help! My server was configured with 3 arrays: array 1 and 2 were each 136Gb raid 5 using the first 5 drives. 3 x 72Gb and 2 x 300Gb. Array 3 was 3 x 500Gb using drives 6 7 8 for 1Tb. I had a ...
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2answers
398 views

Can I do a Raid 5 with a SAS6i/R?

I have a PowerEdge 2970 server with a: SAS6i/R Integrated Controller for PowerEdge 2950/2970, x6 Backplane http://accessories.dell.com/sna/products/cables/productdetail.aspx?c=ca&l=en&s=corp&...
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1answer
1k views

Configure Windows RAID-5 “drive failed” timeout?

When a hard-drive controller detects an error, and needs to remap a sector, the drive normally becomes unresponsive for the seconds (or possibly minutes) it takes to try to complete the re-mapping. ...
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1answer
685 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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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
92 views

RAID-5 how can I guess how many disks was member?

We have a server which we inherited from previous sysadmin. Now the RAID-5 (H/W based on IBM ServeRAID) now unusable, saying not enough disks to operate. On ServeRAID Manager I can see three physical ...
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1answer
135 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 smart-...
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1answer
129 views

Setup 1x RAID5 array with multiple LVs and differnt filesystems?

Centos 5.9 - 2.6.18-348.3.1.el5 i686 Raid5 - 4 Disks + 1 Spare (all WD RED 3TB) Does it make sence to create multiple LV within the same VP and configure them as differnt filesystems: Example: LV1: ...
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1answer
409 views

RAID 5 has no READ speed advantage over single drive?

I have recently acquired an Intel SASMF8I raid card for my office. I have 5 x 1TB disks and have created two arrays, 3 x 1TB RAID-5 and 2 x 1TB RAID-1. The second drive is for sensitive/vital data and ...
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1answer
30 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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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 ...
0
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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
408 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 ...
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1answer
147 views

Should I run extended offline self tests using smartd?

A while ago I setup smartd on all my servers do do a daily "Short Offline" test and a weekly "Extended Offline" test. The config for that is "-s (S/../.././00|L/../../7/04)". Today I noticed one of ...
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1answer
63 views

replace a healthy drive in Raid5 on NAS

Good day! I have a 4 disk Iomega NAS. The config is: 4x2TB RAID5, 4.4 allocated, 2.3TB used, and i kept 1TB as available, but not allocated. Nothing has failed, but while 3 disks are 7200 rpm and ...
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1answer
343 views

Missing 2 Disk out of software RAID 5

I have a Debian squeeze installation with 6x 3TB Disks. On the SW RAID5 are 4 partitions. First for gpart BIOS, RAID 1 for "/", RAID5 for swap and the biggest part RAID5 for files. While the ...
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1answer
82 views

Arch Linux on Software RAID, can't find VolGroupArray

I am trying to install Arch Linux on a Software RAID that I am building following their instructions on the Wiki. I built as far as the Logical Volumes and after that switched to the Installation ...
0
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1answer
345 views

Dell Perc 6i raid5 array: replace drives and expand VD?

I have a Dell T300 with a Perc 6i, to which 3 500Gb drives are connected. The are assembled into a raid 5 ~1000Gb VD. This setup is working fine, however system is filling up and I would like to ...
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1answer
954 views

BAD stripes in controller and windows utility to remap bad blocks

Ok, here is my story. I have 3 disks raid 5, one of the disks made a few surface errors and I didn't know. I tried to repair the corrupted database table in mysql and the machine froze on write. I ...
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1answer
184 views

Do I need to rebuild the array after putting in a new hot spare?

So my experience with RAID is minimal. So I figured I'd come and ask here. We have a 16 drive RAID system that have 15 drives in RAID 5 with a hot spare left over. Recently one of the drives in the ...
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1answer
387 views

Ubuntu 10.04 RAID 10 rebuild status

I got an IBM x3550 M3 server, with 6x 300GB SAS HDD installed, running in RAID10. Ubuntu 10.04.3 LTS is installed. For RAID card, I'm using ServeRAID M5014. If a HDD is replaced, how can I know the ...
0
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1answer
222 views

Raid5 Write cache - Nvidia motherboard

I can't figure out where to enable write-cache for nvida's raid. When using an intel motherboard with ICH10, there is a setting in the raid-software that enables write cache. I can't find that setting ...
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1answer
259 views

Older raid controllers in raid 5 vs. Jbod and SW raid

I'm in the fortunate position to have 6 Supermicro older VOD servers with the following config: Supermicro 3U case, 3xPSU Dual Xeon 3ghz P4 class cpu (5 years old.. havnt checked the exact type) 4GB ...
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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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1answer
149 views

proliant 380gl g5 raid drive rebuilt but leds are both lit bright green

After replacing a failed Raid 5 146gig SAS drive in logical drive 2 yesterday the system reports all is good but the LEDs on the front of the drive are both on and the one on the left is bright green. ...
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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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1answer
65 views

Not seeing the expected volume in a RAID 5

I have expanded a RAID 5 to include 12 - 3 TB drives. I was expecting seeing a total of 33 TB in the RAID but only see 30 TB. I do not have a hot spare. Could 2 drives be reserved for parity? This ...
2
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0answers
162 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 ...
2
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0answers
235 views

raid 5 mdadm drive dropped whilst growing

I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk. ~# mdadm --add /dev/md1 /dev/sdb ~# mdadm --grow /dev/md1 --raid-devices=5 midway through the grow I recieved this in ...
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0answers
58 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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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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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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0answers
28 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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0answers
123 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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0answers
92 views

Partitions not recognized when installing Kubuntu 14.04 over complex RAID setup

I have three identical HDDs. Using a ROM utility, I configured the use of 90% of each of them as a RAID 5 array, and the other 10% as a RAID 0 array. That is, each array uses some area on all three ...
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0answers
596 views

syncing mdadm event count

I had a disk die in my level 5 RAID and before I could replace it, my RAID crapped out while I was copying some data onto it. Reading the RAID kernel wiki on RAID recovery I've tried forcing an ...
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0answers
87 views

Single drive LVM to RAID6 LVM

I cloned my entire LVM volume group from a single drive to a RAID5 array with 3 disks. The VG is formed by these logical volumes: root swap home ... and other volumes of some XEN virtual machines. ...
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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
25 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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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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0answers
28 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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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 ...
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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
84 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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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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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 ...
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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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353 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 ...
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649 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. ...