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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Is it possible to update stripe-width on an existing, and used, etx4 fs?

I have a RAID 5 with 5 3TB drives (8 in few weeks), on a Debian. There is only one ext4 partition on it, using all the space available. Actually, due to origins of the RAID (4 drives), the ext4 fs ...
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2answers
37 views

How to recover from raid 5 failure of 2 disks with tw_cli?

I have hardware raid 5 of 12 disks, 2 of them died and the data is not accessible anymore. I was told that even though 2 disks died, some of the data might be recoverable. My hosting provider replaced ...
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1answer
24 views

Using DC S3700 SSD on Dell T320 w/PERC H710 [on hold]

Replacing an aging Dell T110 server with a T320. We want to make the leap to SSDs for a couple of databases, but am appalled at what Dell is charging for them! Does anyone have experience running ...
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0answers
12 views

Boot from RAID with PERC H310 on Dell PowerEdge R520

I'm trying to install an OS on an R520 with the PERC H310 RAID controller and set up two physical drives as a virtual drive with RAID-1. However I can't select that virtual drive in the boot sequence ...
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2answers
41 views

Is it a good idea to use two different SSDs in RAID1? (to avoid both drives failing at the same time because of some manufacturing bug)

I'm building a new server here at university and I suggested that we use two different SSDs in RAID 1 (mirror) to avoid both drives failing at the same time because of some inherent manufacturing ...
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2answers
2k views

Dell PowerEdge 1800 Hangs at boot after Dell PERC Sata RAID Controller Successfully POSTs

Server crashed one night. I rebooted, now it hangs just after the SATA RAID Controller successfully POSTs. This unit has a RAID 5 array, but I haven't pulled a recent enough backup of the data on it ...
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2answers
50 views

Server raid doesn't boot in the morning

We have a HP Proliant ML350 G6 with integrated sas raid controller. Since 3 days the server starts up in the morning without this raid. All othe HDDs / SDDs are ok. We did install the ServicePack ...
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1answer
31 views

LVM2: pvscan with offset?

After I played with mdadm a bit too hard, I'm now tryng to recover my lvm2 volumes that were sitting in the original RAID1 array. pvscan finds nothing, but that's not a surprise: since mdadm is not ...
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1answer
45 views

Does the SAS Expander / Backplane matter?

If I am buying some used servers with 24-25x SAS that I hope to someday upgrade from 6Gb/s to 12Gb/s RAID, do I need to be concerned at all with the backplane that the drives are plugging into not ...
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1answer
9 views

How to Mounting RAID0 EBS Volumes after reboot on EC2?

I've already attached two volumes to my EC2 instance and configured RAID0 for them. After a reboot, the volumes didn't re-attach. I thought I had configured them to attach on reboot in fstab but they ...
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1answer
2k 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
91 views

Partitioning & RAID recommendation for a server with 3 disks

I'm installing a server machine (intended to run Debian GNU/Linux) which, among other things, is to be used for backups of our code. Now, I don't need all of the contents of the HDD to be ...
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2answers
742 views

3ware raid controller splits raid array into two peices. what do do?

I have a server with a 3Ware 9650SE 8 port controller. I had an 8 drive raid 5 array with a hot spare drive as part of the array of roughly 3.87 TB in size. When I signed into the server today, I ...
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1answer
28 views

Linux: Rebuilding software Raid 1 fails when adding partition

I had an issue yesterday with a software Raid, where one disk had to be replaced. I removed the partitions from the array using mdadm /dev/mdx -r /dev/sdbx After the failed drive has been replaced ...
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2answers
353 views

Alternative to software RAID for mirroring

I've read "on the interwebs" that Raid is starting to become an inadequate solution with todays large disks. As I've understood it, the rebuild time and the risks for rebuild failures are very ...
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1answer
815 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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5answers
3k views

Do I need to RAID Fusion-io cards?

Can I run reliably with a single Fusion-io card installed in a server, or do I need to deploy two cards in a software RAID setup? Fusion-io isn't very clear (almost misleading) on the topic when ...
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1answer
22 views

RAID 5 Online Capacity Expansion sector size changed

I just started RAID 5 Online Capacity Expansion, and noticed sector size went form 4K to 512B. Could this be a problem?`I did not a have a sector size option when adding the disk.. Running on ...
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4answers
6k views

What purpose does the battery serve on a battery-backed caching RAID controller if the server is on an uninterruptible power supply?

Is the battery redundant if the server is on a properly-sized UPS? There is an option to force write-back mode and I want to understand the risk. It is my understanding that it helps against power ...
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1answer
2k views

Replacing a failed and degraded virtual disk on Dell T110 II RAID 1 PERC S300

We have a Dell T110 II server, factory installed with Microsoft Windows Server 2012, Standard x64 Edition, running PERC S300 RAID Controller (1068E HBA). It came installed with RAID 1 on the 500GB ...
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1answer
35 views

Optimal configuration with Synology as HA iSCSI backend for vSphere

I'm looking into purchasing a new storage backend for our VMware vSphere Essentials package. We have 3 ESXi hosts, currently mainly using DAS. The goal is to upgrade to Essentials Plus this year, to ...
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1answer
956 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
17 views

Raid-5 Linux Software array, 3 drives “removed”

I have a raid array with several drives marked as removed. I want to add them back in, but am not sure how to do so. [root@tera2 ~]# mdadm --detail /dev/md3 /dev/md3: Version : 1.2 ...
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1answer
59 views

CentOS 6.6 on HP Proliant 360 [duplicate]

I have 3 of the aforementioned servers, and when I netinstall centos on them, the installer recognizes the raid configuration and the logical disks and installs fine. Upon reboot after installation, ...
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2answers
528 views

LSI Cachecade Pro 2.0 with RAID10 SSD Cache?

I'm trying to add a RAID10 SSD Cache to a VD by this command: [root@livecd storcli]# ./storcli64 /c0 add vd cachecade type=r10 drives=252:4,252:5,252:6,252:7 assignvds=0 Controller = 0 Status = ...
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0answers
18 views

RAID 0 handling with external controller [closed]

Does DELL SAS 6/IR work with 3TB drives? If not which external controller which support 3TB drives do you recommend? I've got Dell Precision T7400 WorkStation and two 3TB SATA Segate drives WD30EZRX ...
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0answers
24 views

Possible drive failure? BSOD on Windows Loading screen -> Server 2008 R2

I've got a rig running Windows Server 2008 R2 with 2 1TB drives in it. I believe they were in a RAID 1 Software array. Recently I went to restart the computer, and on startup it BSOD when the ...
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0answers
3 views

Converting Boot drive from RAID0 to RAID1 [migrated]

I bought a HTPC I plan on using as a NAS/HTPC combo, which has been working well for me for a while now. When I bought the machine from Dell, it came with 2 500GB HDDs in a RAID0 configuration as ...
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2answers
140 views

Would software RAID0'ing SSDs help or hinder maximization of useful CPU work throughput?

My question is in the title... here is some background: [OS is Linux.] [UPDATE: The contents of this RAID0 is redundant (sync'd from SCM). I am not worried about the increased risk of data loss.] ...
2
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2answers
4k views

HP Dynamic Smart Array B120i ESXi performance issue

One of our small offices was in need of a small server to perform certain tasks. Because the noise and size an of a regular server i went with the HP ProLiant Microserver Gen8 G1610T. Witch i expected ...
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2answers
39 views

ESXi sees RAID1 as two hard drives

The server is Proliant ML330 G6. I've activated the embeded SATA RAID in BIOS. Created 1 logical drive in "Option Rom Configuration for Arrays" in RAID 0+1 that consists of two 1TB drives. So in other ...
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2answers
2k 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 ...
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1answer
930 views

IBM ServerRaid lost Raid-5 configuration

I have an IBM server x3400 with 8 drives divided into two arrays. After reboot, ServerRaid lost the configuration of the Raid-5 array. The 6 drives that used to be part of this array are there, but it ...
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0answers
24 views

IBM x3950M2 server, no drives detected during windows install

I have an IBM x3950M2 (72236MU) server that was running Server 2012. I decided to swap some drives around and reinstall from scratch with Server 2012r2. However I am unable to get the windows ...
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6answers
6k views

Dell Workstation Raid: Software or Hardware?

Looking at getting some Dell Workstations (T3500). One of the options is to raid 1 the harddrives (presumably this would give you a speed boost). Is this software or hardware raid?
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1answer
34 views

Which RAID to use for 8 hard drives? [closed]

I have 8 idendical hard drives and I want to know which RAID levels or level combinations I should use to achieve maximum performancefor random reverse reading.
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2answers
26 views

SW ZFS vs. HW RAID controller

I run a FreeBSD 10.1-RELEASE webserver, and I have 2 sata HDD on a HW RAID1 controller, but when I installed the OS, it won't do it on a ZFS filesystem (for mirroring as I intended to) but I was ...
41
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10answers
6k views

RAID - software vs. hardware

I have always used hardware based RAID because it (IMHO) is on the right level (feel free to dispute this), and because OS failures are more common to me than hardware issues. Thus if the OS fails the ...
0
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4answers
218 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 ...
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1answer
46 views

Does hardware RAID1 offer significant advantages to S/W RAID in a computer cluster that's highly redundant?

I'm about to set up a Linux cluster of 5 physical server nodes (more nodes to be added later, probably). the cluster will be managed by Proxmox (and yes, it works in software RAID) shared storage ...
1
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2answers
55 views

How does LSI MegaRAID actually lay out RAID10 sets?

I'm trying to set up a RAID10 set on an LSI MegaRAID controller. It is unclear to me how the RAID controller will actually lay out the RAID set on the physical drives. Part of the problem is that ...
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0answers
32 views

Replacing a failed harddrive in a RAID set with arcconf (Adaptec RAID Controller)

I just wanted to confirm some things before committing to production equipment, so I thought I'd run it by serverfault. I had a dead drive. It was not showing up in arcconf getconfig 1 PD and was ...
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1answer
72 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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1answer
48 views

RAID 1 failed disk replacement - backup recommendations [closed]

Having recently lost one drive in a RAID1 (mirrored) setup with a "hot spare" on a HP ProLiant ML350 G6 server, we're about to have it replaced with a new one. The disks are hot swappable so for that ...
2
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1answer
1k views

How to get email alert if one of raid 1 disks fails?

I need to know how can I get email alert if one of raid 1 disks fail to work/crashes. I have CentOS 6.4 64bits, software raid. I did some mistake folowing this tutorial, because it was a bottom note ...
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1answer
24 views

Rebuild the Software RAID Array after a Drive Replacement

I had a disk failure on my dedicated server with 1and1. They have sent me this guide. ...
2
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1answer
1k views

mdadm: Growing a RAID0 Array Weirdness

I have created 3 RAID0 arrays using mdadm on 3 Rackspace CloudServers using Rackspace's CloudBlockStorage as their devices. Each array has their own set of CBS volumes. RS-CBS has an upper limit of ...
2
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1answer
920 views

Recover mdadm RAID 10 array: listing all as spares

I'm a bad person and haven't backed up my RAID elsewhere. I now have a RAID10 array that won't assemble, and I'm hopeful I can save it. Here's the details: I have five hard drives set up as RAID10 ...
2
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0answers
83 views

ZFS - zpool replace never finishes

I have a 5 x 3TB raidz1 array on a ubuntu 14.04.1 server. Last month, one of the drives died (audible clicking). I was able to replace the drive with zpool replace RAID <dead drive> <new ...
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1answer
2k views

How to delete removed devices from a mdadm RAID1?

I had to replace two hard drives in my RAID1. After adding the two new partitions the old ones are still showing up as removed while the new ones are only added as spare. I've had no luck removing the ...