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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3
votes
1answer
390 views

Manually recovering a RAID5 array, how to approach?

Basic situation: I'm looking to manually reconstruct a RAID5 array for which the controller has lost the configuration. To complicate matters, the volume is encrypted with full disk encryption (to ...
0
votes
2answers
95 views

Two RAID array - performance from application?

I have a RAID 10 array with four 1TB WD RE4 drives SATA II. The OS is installed on it and our accounting software (SAGE 50). I was considering adding two 256GB SSD's in RAID 1 to store the data from ...
3
votes
1answer
1k views

Linux server not booting after rebuilding software RAID

I have a dedicated server at 1and1 with a software RAID. I believe it's running CentOS. The hardware team at 1and1 replaced the secondary hard drive (sdb) and then I followed these instructions to ...
0
votes
1answer
422 views

Raid 10 - Very slow [closed]

I have Software Raid 10 setup, it has been working great a few months. When I did a quick HD speed test: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync It is taking forever and I had to ...
0
votes
1answer
249 views

Dell PowerEdge 2900: raid/Linux conversion logistics

I've got a Dell PowerEdge 2900 (currently running windows) that I want to convert into a Linux server. But, it's got a hardware RAID controller and I want to be sure I don't destroy the configuration ...
0
votes
1answer
642 views

How do I get rid of my duplicate GRUB entries? (Ubuntu 12.10, RAID1)

I have a Dell R300 machine running Ubuntu 12.10: $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.10 Release: 12.10 Codename: quantal $ uname -a ...
-4
votes
1answer
121 views

are there RAID configuration defaults for storage devices? [closed]

Are there certain default configurations within storage devices (such as IBM System Storage DS5020 Express) for RAID 5 and RAID 10? [tried to find if there were by reading whitepaper for DS5020, but ...
-3
votes
1answer
51 views

number of disks for RAID config vs. effect on performance? [closed]

I was wondering how the number of disks used for RAID configuration affects performance? I know that it takes longer to rebuild data, but are there any other performance areas affected??
3
votes
1answer
256 views

Cannot get at data in my NAS

I've got a bit of an issue that I'm hoping you can help me with. I have an Iomega ix4 as my NAS. This runs Linux and each drive in the box has 2 partitions: one for the OS and RAID info, and the ...
6
votes
2answers
8k views

Disk/RAID Monitoring for HP Proliant Servers and Ubuntu 12.04

How can I monitor the status of the hard disks and the RAIDs of an HP Proliant server using Ubuntu 12.04. In Ubuntu 10.04 I could use the cciss-vol-status to query the RAID status periodically but ...
-3
votes
1answer
231 views

Raid 1/0 SSD vs 2 x non-Raid SSD [closed]

I have a question about speed performance with two separate SSD drives comparing them to RAID mirror array. I do not like idea to setup RAID 0 with 2 x SSD drives because of high risk of data loss, ...
1
vote
1answer
847 views

How to detect hard disk failure?

So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down: Personalities : [raid1] md2 : ...
0
votes
1answer
280 views

2 RAC node clusters with different RAID layouts?

I am comparing RAID 10 and RAID 5 configurations for Oracle database in order to determine the best choice in terms of performance for mixed workloads. Is it possible to have 2 RAC node clusters and ...
-3
votes
2answers
922 views

How much overhead does ZFS have? [closed]

Adding a file system to a raw device of course takes up some overhead. The question is how many percent does ZFS take? And does overhead differ depending on the ZFS raid set? Update The purpose is ...
0
votes
1answer
422 views

How to solve Critical Logical Driver Error

I was checking the logs in server when i came across this message. Nov 4 12:52:05 SERVERNAME ServeRAID Manager Agent:[338] Periodic scan found one or more critical logical drives: controller 1. ...
2
votes
2answers
752 views

mdadm - Recovering a 'split' RAID1 array

I have two drives that used to be part of a single RAID1 volume but it appears that one of them went offline for some time, something I've noticed just now when I rebooted my system. I now seem to ...
1
vote
2answers
849 views

Linking FreeNAS Boxes

I have two different FreeNAS boxes that are being used for storage. It is possible to link them in a manner that the linked connection can be presented as a single storage destination for clients? ...
-1
votes
2answers
430 views

Should I disable Software-RAID if I already have a redundant copy

My hosting provider preconfigures the servers I rent with RAID-1. However, for redundancy, I am planning to have another copy of the data on another server using GlusterFS. Can I disable the RAID-1 ...
0
votes
1answer
370 views

RAID Card Event Notifications Email to Gmail

I need to get email for event notifications from our RocketRaid 2782. The problem is I don't see a way to get it to send mail to our google apps gmail account. I don't think the card offers ...
0
votes
1answer
2k views

HP ProLiant DL360 G5 disk diagnostic issue

We recently got two used drives (15000) and installed on our HP proliant dl360 G5 server. Created RAID1 and used HP SmartStart CD to perform diagnostics. Interestingly, the Diagnostic tab immidiately ...
4
votes
3answers
2k views

Sparing level on HP EVA 4000

One of the disks of our EVA4000 died today. This diskgroup (all volumes vraid5 with sparing level 1 and almost no space left for more volumes, 1TiB drives) is being rebuilt with "spare space" right ...
-2
votes
2answers
236 views

Is it okay to shut down Adaptec 5085 / MSA60 raid for 5 hours?

Adaptec Raid 5085 with no battery (on the raid card) 6 MSA60s Raid 10 Big APC UPS with low load Our building power needs to go out for 5 hours. Is it okay to shut down the raid ...
0
votes
1answer
137 views

What does the the reconstruction process of mdadm do exactly on raid10

I've got a system with 4 disks set up as raid10. All disks are usable, and mdadm all states them with UUUU. Due to a recent system crash, the raid is currently reconstruction the raid as it was ...
0
votes
1answer
197 views

Mounting device in fstab using labels

I'm trying to mount a device using a label in my fstab but it never actually mounts on boot. # LABEL=/ / ext4 defaults,noatime 1 1 tmpfs /dev/shm tmpfs defaults ...
4
votes
1answer
5k views

Cannot install grub to RAID1 (md0)

I have a RAID1 array on my Ubuntu 12.04 LTS and my /sda HDD has been replaced several days ago. I use this commands to replace: # go to superuser sudo bash # see RAID state mdadm -Q -D /dev/md0 # ...
2
votes
2answers
271 views

Shell Script To Monitor Completion of RAID Assembly

How can I pause execution of my shell script after calling the following command until the raid array has been assembled? From what I understand, this is an asynchronous process and status of the ...
2
votes
3answers
2k views

RAID10 without write-back cache = horrible write performance?

I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache ...
0
votes
1answer
128 views

Lost RAID partition for no clear reason [closed]

We have some machines with a RAID 1 out of two 2TB hard drives. Now it has been found to the error that the partition was not recognized from OS (Windows in most cases). In the configuration menu ...
1
vote
3answers
2k views

Create mirror software raid with bad blocks hdd. How to check data integrity?

There is error in System event log like this one: "The device, \Device\Harddisk1\DR1, has a bad block." Because of above I created Raid 1 on this disk and other one. I'm using Windows Server 2008 R2 ...
3
votes
2answers
514 views

From which plex am I booted from on raid?

I have a server with mirrored boot volume. It is software raid 1 in Windows Server 2008 R2. I do not have physical access to the server. I am looking for a way to check which disk is a boot drive. I ...
3
votes
1answer
262 views

How do I put back different SCSI hard drives into their original RAID arrays across different servers?

I have potentially a big mess in my hands: I received today a box with several hard drives that used to be connected to different servers each one of them using an unknown - at least as of right now- ...
2
votes
1answer
81 views

mount hardware raid disk 1 with one disk and no hardware raid controler

I have one of two raid disk (from LSI raid card) There is a way to mount it in a PC and access to the disk without the raid card? Maybe mounting or skipping the first bytes!? Thanks in advance. ...
0
votes
1answer
301 views

How to re-add a RAID-10 failed drive on Ubuntu?

I have a problem that I can't seem to solve. We have a Ubuntu server setup with RAID-10 and two of the drives dropped out of the array. When I try to re-add them using the following command: mdadm ...
-1
votes
1answer
224 views

ZFS Configuration advice

I need some advice on configuring ZFS. Here is what I have: Physical Disks: 4x 3 TB 2x 2 TB 2x 1 TB What is the best configuration for my Vdevs and storage pool. I want to maximaze space but ...
1
vote
2answers
514 views

Creating a raid on MSA60, will it check for bad disks?

I'm recreating the raid on a old msa60. Would it check for bad disks when I create it? It is three msa60 enclosure with 12bay and 1TB each. I need around 24TB usable storage, what would the ideal raid ...
1
vote
1answer
161 views

Does any hardware RAID controller support hot expanding a unit to larger disks?

I am wondering if the following is possible with any RAID card currently in existence. (Not interested in software RAID): I start with a RAID 10 of 500 gig disks. (unit size is 1 TB) I want to swap ...
3
votes
2answers
823 views

Linux Software RAID1 Rebuild Completes, but after reboot, its degraded again

I have been beating my head with an issue here, and I'm now turning to the internet for help. I have a system running Mandrake Linux, with the following configuration: /dev/hda - This is a IDE ...
1
vote
1answer
329 views

SCSI controller vs RAID controller

I have a Poweredge server which has a Ultra 160 SCSI controller, I was wondering if this has the ability to set the drives as RAID1 or 5? Is a SCSI & RAID controller generally the same thing?
5
votes
2answers
2k views

NAS device claims drive in a RAID is degraded but S.M.A.R.T. says it is fine

I have a Synology DS213 with two 600GB drives in RAID 1. Last night the device reported that my second drive had become degraded and that I should replace it. When I ran a extensive S.M.A.R.T. test ...
1
vote
2answers
249 views

Swapping RAID Drives between machines

I'm very new to RAID, so please bear with me. I have 2 servers, both identical hardware, but one's running Windows Server 2003, the other is running CentOS. I now need to make a clone of the Windows ...
-5
votes
2answers
49 views

New storage, How to divi it up [closed]

About to receive out new HP P2000 SAS enclosure. it will be connected to three servers running VMware. it will have 24 x 300 Gig SAS disks. I have DC's Print servers, File servers, Exchange, SQL, ...
3
votes
2answers
194 views

Replace fail disk in ML350 G5 when system is running

I have a RAID 1+0 consisting of 4x 146GB SAS disks on a Smart Array E200i. One disk reports an error in event log: The Physical drive at Port 1I : Box 1 : Bay 2 is reporting S.M.A.R.T. errors. ...
2
votes
1answer
299 views

How to get started troubleshooting Linux mdadm raid10 write performance?

Using Linux mdadm, I've setup a six disk raid10,f2 array. I'm using 7200RPM SATA drives. The biggest load I am worried about is recording four streams of live video (worst case of 20Mbits each, final ...
0
votes
2answers
51 views

Creating a new RAID1 array more quickly

I'm new to RAID. Creating a new RAID1 array from blank, newly-partitioned 100GB disks with sudo mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/xvdf1 /dev/xvdg1 ...looks to ...
2
votes
2answers
403 views

Migrate linux from software RAID (mdx) to hardware RAID

Current situation: Dell PowerEdge T300 server (SAS6/iR controller) (RAID 0/1) Ubuntu 10.04 LTS server installed on software raid (2x500GB) + LVM. Currently used space 25GB. Questions: How to ...
0
votes
1answer
172 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 ...
0
votes
1answer
699 views

Dell PowerEdge R210 running VMware ESX 4.1 losing access to local disks

Every month of so, one of my server running VMware 4.1 became unresponsive. The only way to get it back up was to do a hard reboot. When this happened I could connect to VMware but was not able to do ...
1
vote
3answers
935 views

Raid advice : one raid5 or two raid1 on small fileserver

i recently start working in a new (small) company having an "old" file server with windows server 2003 and an hw raid 5 with four disks. Last week the server is dead. We decided to build up a newer ...
3
votes
1answer
217 views

Added drive to PERC6/i raid5 array instead of replacing - is there a way to fix this?

This is a 3 drive RAID5. The disk in slot 1 failed. After the disk was replaced, I ran: MegaCli64 -LDRecon -Start -r5 -Add -PhysDrv[32:1] -L0 -a0 Obviously that was not the correct command as now ...
1
vote
0answers
296 views

Restoring a GPT XFS partition?

I recently added some storage to a RAID array with a single large XFS volume. To expand the volume I normally use parted to remove the partition and then recreate it so that it spans the entire ...