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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AOC-LPZCR2 Equivalent RAID card

We have just had a 'AOC-LPZCR2 Low-Profile All-in-One Zero-Channel RAID card' fail. Unfortunately, we are unable to source one straight away. Does anyone know of an equivalent card which we could use ...
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415 views

PCIe SSD vs SSD vs SAS - which is best for Database?

Since I am going on shipping soon I wonder which generally will mostly boost the database performance ? The bridge question is - which will boost mostly a database which having a lot of random block ...
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1k views

Installing Adaptec 5405 RAID card HDD LED

I'm trying to install an Adaptec 5405 RAID card into an Intel 1RU server, and I need to figure out how to connect the existing SGPIO connector from the backplane, onto the card itself (at least I ...
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2answers
7k views

How to use SAS Expander with RAID card?

I've doing some researches since few days and I haven't really got an answer to my question. I am in the process of building a huge file server for the company I work for. We bought a server case ...
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3answers
289 views

Best raid configuration for my sql Server 2005

I have SQL SERVER 2005 database running on windows server 2008 with following configuration SERVER:HP Proliant ML380 G7 CPU: 1 RAM: 10 GB of RAM HHD: 3*300 GB HHDs with RAID 5 configuration. It has ...
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1answer
2k views

How do I check if smartd and mdadm are running correctly?

I have a raid system on debian: Disk /dev/sda: 320.1 GB,... Device Boot Start End Blocks Id System /dev/sda1 * 1 2432 19535008+ fd Linux raid ...
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1answer
166 views

RAID 5 Array A00-01 is “optimal” but not showing when I boot from my RAID 1 Array A00-00 OS

This server was originally setup with RAID 1 mirrored drives for the C:\ primary partition where the Operating System was installed. And a RAID 5 array with 3 drives for the data partitions. The C: ...
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0answers
341 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
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1answer
3k 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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2answers
69 views

Server Upgrade and Data migration [closed]

Hello, I'm migrating a server here is the detail of both server, Copy from Location Current Server have 450GB of Data in home drive, which is critical and must be copied.Current Server have 7200RPM ...
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1answer
3k views

Manage Intel RAID in Windows

I have a box with Intel C600 Series Chipset SATA RAID Controller. Three RAID1 sets were configured at built time and Windows 2008 Server was installed on one of the RAID sets. The box has been ...
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1answer
740 views

RAID6 degraded drive during rebuild

Background and context I have a 3ware LSI RAID controller and a RAID6 setup over 16 physical disks. One of the HDDs died last night, and I replaced it with a brand new (identical) drive this morning. ...
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2k views

Reset Disk - Windows Storage Server 2012

I set up windows storage server 2012 and have 6 SATA drives in a raid configuration. Prior to production use I tested by removing drive and adding a spare and rebuilding. That went fine. Now I see ...
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1answer
686 views

how can I diagnose a “frozen” linux software raid device?

I have a server running Linux 3.2.12 32-bit i686 with 13 drives: 1 boot drive, and 3 raid5 devices of 4 drives each. /proc/mdstat shows Personalities : [raid1] [raid10] [raid6] [raid5] [raid4] md2 :...
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0answers
247 views

Half of disk space missing on RAID1, all disks it seems to be ok

Hi there. I have a problem with raid array. I miss it a half. My disks layout is 2 x 250 gigabytes velociraptors (Array_0000) 2 x 1TB velociraptors (Array_0001) ....both connected in RAID1. OS ...
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1answer
2k views

Resize partitions used in Debian software RAID 1 mirror

I have a simple RAID1 setup with a few drives. I've realised that one of the partitions is not aligned to a cylendar boundary and I'm concerned that this is a bad thing that will cause me grief at ...
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2answers
1k views

Duplicate partition table in (Debian) Linux

A disk failed in a software RAID array and I'm trying to replace it. I've done this before without a hitch but this time I'm getting an error when trying to duplicate the partition table. I'm using ...
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2answers
554 views

RAID 10, 3 drives or 2 drives?

Drives are very cheap these days. Would it be worth it to increase the group size from 2 to 3. I found 1TB drives for $60. I feel as if the array is very vulnerable to failure in a 2 group setup ...
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2answers
316 views

Adaptec raid 1 on ibm 206m

So I have an IBM xseries 206m. It was working fine and one day after a reboot I noticed something weird about the RAID. It has a RAID 1 configuration, after this reboot (windows updates), I saw two ...
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1answer
4k views

How should I calculate IOPS for RAID50 & RAID60?

I'm investigating some 4TB database systems and I'm comparing differences between RAID-10 & RAID-50. I know how to calculate the IOPS for common RAID levels like RAID-1, RAID-5 & RAID-10. ...
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1answer
439 views

What is the Mean Time to Failure (MTTF) of a RAID5?

Given the MTTF T of an individual drive (say, 100000 hours) and the average time r it takes the operator to replace a failed drive and the array-controller to rebuild the array (say, 10 hours), how ...
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1answer
2k views

Should I enable “Patrol Read” on SSD drives?

LSI, Intel and Dell RAID controllers (perhaps others) have a "Patrol Read" feature to try to spot when a drive is failing before it completely fails. LSI seems to disable patrol read on SSD by ...
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2k views

Safe recovery of a working RAID Array after OS drive failed

I'm working with a server that recently had two drives fail. Windows Server 2003 - Standard Array 0 (bootable) - two 35GB U320 drives in a striped set. Array 1 - two 35GB U320 drives in a striped ...
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1answer
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Managing battery relearn cycles on LSI and similar RAID controllers

How do engineers deal with RAID controller battery "relearn" cycles? As noted in: What's a "battery relearn" on a LSI MegaRaid?, relearn cycle discharges the RAID controller battery (...
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186 views

Windows Server 2008 Software RAID with Different Size SSD's [closed]

I'm planning on buying an extra SSD to install into my server to do Software RAID1 in Windows Server 2008. At this moment I have a Crucial M4 64GB SSD which is running fine, I would like to add a ...
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2answers
7k views

S.M.A.R.T data from disks behind LSI MegaRAID Controller in ESXi 5.1

I was looking at ways to get S.M.A.R.T info and R/W stats from drives behind LSI MegaRAID controller (9260-4i) in ESXi 5.1. ESXi has a command "esxcli storage core device smart get" to get S.M.A.R.T ...
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2answers
127 views

Raid 10 data failure

If I have 16 drives in a RAID 10, how many drives would I have to drop to have data loss?
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1k views

IBM x3650 M1 SATA support up to 2 Tb

I have an IBM x3650 (M1 [i think because of DDR2 rams]), an as i know it only support SATA hard drvies only up to 1 Tb. Is there any RAID controller firmware/BIOS update which can give the server 2 ...
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1answer
1k views

Rebuild mdadm RAID5 array with fewer disks

I have a 4 disk RAID5 array, one of which is starting to fail according to smartd. However, since I'm using less than half the space on /dev/md0, I'd like to rebuild the array without the failing disk....
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91 views

HP p400i - 512MB RAID Controller card

Anyone know if the HP p400i raid controller can support multiple arrays? Say if I wanted a raid 0 with 2x146GB drives, and 3x300GB drives in a raid 5, both on the same card? Also, is it possible to ...
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2answers
302 views

What if Areca 1212 Raid card fails?

So I have a basic server: i5, 4GB ram, Areca 1212 Raid card, 1x sata 40GB HDD (for OS) connected to motherboard sata, 4x 2TB HDDs all configured into RAID5 (for /home data) connected to Areca Raid ...
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2answers
172 views

Build RAID 1 array (non-boot), apparently all data is gone?

The computer that this is occurring in, has a 40GB boot drive (Debian) and two non-boot drives. I have two identical 1.5TB drives (one partition on each), and one of them had data on it (other was ...
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0answers
804 views

Expand Raid 10 set on MegaRAID LSI 9261-8i

I have an existing Raid 10 drive with 8 drives. 4 in each span. I can't figure out how to expand the set by adding two more drives, one to each span. I'm using the MegaCLI command line tool. I ...
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1answer
2k views

How to recover data from Apple raid 0 drives from dead xserve?

Yesterday, I was given two 160GB hard drives that used to form a striped RAID in an Apple xserve. The xserve is completely non-functional, but the issue is unrelated to the hard drives and I don't ...
5
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1answer
704 views

Drives randomly dropping from RAID array

We have 3x 3TB WD Red drives configured in a RAID 5 on an HP P812 controller with the latest firmware on. However, drives keep being dropped randomly from the array upon reboots, though not always. ...
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1answer
586 views

RAID1 - Possible to recover failed drives?

PowerEdge 1850 has two physical hard drives, configured as RAID1. Accessing via DRAC 4/I I can see that both drives indicate Failed & Offline. However, the DRAC log indicates that both drives "de-...
2
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1answer
8k views

Installing Ubuntu 12.04 on HP Proliant DL380e with 1TB SAS Drive

I have an HP Proliant DL380e with a 1TB SAS Drive and I am trying to install ubuntu server 12.04 on it. I have created a RAID array using Array Controller Utility and had a RAID0 logical volume ...
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1answer
93 views

Removing and re-adding a raid drive

Lets say I remove a drive from a RAID array on a HA server for a period of time then re-add it. Is there a way to limit the rebuild to a diff of what has changed since it was pulled, or does it have ...
2
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1answer
506 views

Concerns of simultaneous failure of SSD Raid1

Since SSD's have a write limit requiring wear leveling one would assume that all things being equal 2 identical SSD drives would wear nearly identically if they mirror data writes. When one drive ...
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3answers
520 views

Small office backups, small NAS (RAID) vs single disk

Assume a small office situation, 5-10 workstations (PCs), and a Windows server hosting a network share. The Windows server is in a 3+1 RAID 5. I am debating with myself over a backup solution and I ...
2
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1answer
3k views

Linux - dmraid (or mdadm) - Rebuild RAID 10

A while ago I had a raid10 config crap out on me, and am now just getting around to trying to salvage the array so I can rebuild and move on with my life. Basically a drive in each subset failed, ...
2
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2answers
89 views

erased md0, md1 and can't recreate them

I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1. I need to set them up again. When ...
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1answer
4k views

DELL Server RAID Exception - Resyncing

Today they brought this old DELL server with 2 HDD initialized in RAID 1 Array. The server was used as a syslog aggregator for a long time and I was tasked to to some maintenance before we return the ...
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3answers
1k views

IBM SR-BR10i RAID Controller too slow with VMware ESXi

I'm transferring a virtual machine from one ESXi host to another using SSH on both ESXi Servers. But it's painful slow, it's a massive 750GB .vmdk disk image, the VM is stopped (with downtime) and ...
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3answers
110 views

Two drives, how can i max reliability and uptime? [closed]

I have an asterisk pbx. It has 2 drives in a raid 1 setup. However if my main drive fails my 2nd won't boot, as it has no boot partition. The most important thing for me is up time. If there is a ...
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1answer
4k views

Fixing a failed grub upgrade on RAID

We just upgraded out dedicated server from Debian Lenny (5.0) to Debian Squeeze (6.0). In the process, the grub upgrade failed. I (perhaps foolishly) followed the advice at http://askubuntu.com/a/...
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1answer
2k views

HP Proliant ML350 G5 SAS HDD

I am getting problem in HP Proliant ML350 G5. Some few days back one of the SAS HDD failed. It was 146GB SAS 15krpm HDD. We got new one which is 146GB SAS 10k rpm HDD. Its on RAID 1(1+0) configuration....
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1answer
152 views

Speed up RAID 1 drive read speeds

Sorry I don't know much about this stuff...we have been having issues with a slow server, very slow for users and when you access the server direct, we have added more RAM but it seems it may be a ...
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2answers
429 views

HDD in RAID failure?

I received some alerts from mdadm. Further checking seem to indicate that some HDD's may be damaged. Could you please verify that? There is two SCSI drives which should work in RAID1 This is an ...
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2answers
3k views

HP P410 ADU (hpacucli) generates empty report

I'm trying to monitor hard drive's smart status. I've tried smartctl tools and HP's own hpacucli to generate ADU report. However, neither of them are useful. smartctl does not show values like Power ...