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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Adding two new harddrives in raid one to an existing server (Dell R410)

We are getting short of space in one of our machines (Dell R410) and were thinking about adding a couple of drives (right now the server runs with 2 ssd disks in raid 1). Will it be possible to add ...
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52 views

MDADM not showing RAID5?

Background: I own a Blackarmor NAS 440. I set up 4 brand new 3TB Seagate drives in RAID 5. It has been working fine for ~2 years, until this July. This is what happened in July : HDD3 failed. I ...
2
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1answer
21 views

Abstract physical drives to create a resizable raid array: is it possible?

I want to set up two hard drives with a portion of them set in raid1. I want that portion to be scalable too, as logical LVM volumes are. Is it possible to abstract physical volumes or to create an ...
0
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2answers
62 views

How can I force soft raid to read only from one disk?

I have quite a large IO wait showing in top. I suspect this is fault of SDA drive (on of 2 disks in RAID array), which was replaced about week ago. There are no errors visible, smart showing nothing, ...
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2answers
64 views

RAID 10: Does it impact performance if I have 24 small drives in Raid10 vs. 4 larger drives?

Does it impact performance if I have 24 small drives in Raid10 vs. 4 larger drives? The root of the question is does it have any performance or redundancy benefit if I fill out all 24 of my bays with ...
1
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0answers
26 views

added new drives to raid 5 with wrong format then removed them and broke raid 5

thanks in advance for any help. In summary: I added 3 new disks to raid 5 array. Then, thinking they were not added, I removed them. Now the array doesnt work. What can I do to get back the ...
1
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2answers
92 views

Windows Tool to read S.M.A.R.T. attributes on SATA drive in HP D2700 Enclosure using P812 Controller

I've got two HP DL380 G7 servers + P812 controller + D2700 enclosure. They're database servers with 144 Gb RAM. P812 firmware is 6.40, D2700 is at 0147 They both worked great with 18 OWC Mercury ...
2
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1answer
119 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.] ...
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0answers
31 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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0answers
16 views

Increasing the size of a 3ware 9650SE RAID5

These questions seemed similar, but they did not worK: Why is the 9650SE RAID1 not showing the full size of the disks? How can I increase the size of a RAID 1 array from 750GB to 1TB? 3ware Here ...
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1answer
29 views

Remote system's filesystem disappeared after “mdadm --grow 2 /dev/md0”?

Yesterday, I added a second 500GB hard drive to a system. This system was installed as a RAID-1 system with only one drive, because I didnt have the other one on hand. After finally adding the second ...
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2answers
24 views

How do I list which drives are part of each RAID array?

I have a linux software RAID using md. I want to list all of my RAID arrays and each hard drive attached to them. Is there an easy way to do that?
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0answers
16 views

ASUS Server SAS over SATA connectors?

I'm researching purchasing/building an ASUS RS720-E7/RS12-E Server with a Z9PE-D16 motherboard for hopeful use with VMware ESXi v5.5. But, I would like to make use of all 12 HDD bays (RAID 10) in the ...
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1answer
26 views

Can't mount raid 1 with different size disks

I have a EC2 instance with a an ssd on xvdm (20 gb, 60 iops) and another ssd on xvdb (16 gb, better iops - instance store). The xvdm contains a mysql database and I'm trying to join these 2 disks in a ...
6
votes
1answer
227 views

Reusing a drive from an array

I read the question here Reusing Raid 5 Drive? but I'm not sure it applies 100% to my situation. What is the standard practice when removing a drive from an array to use as a spare for another array? ...
2
votes
1answer
57 views

HP P420i SSD RAID Configuration

I've been testing a HP DL380p with 16x SSDs in a RAID5 on the P420i controller with 2GB FBWC that is integrated on the board. Quite good performance, but not good enough. When I simulate the IO ...
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1answer
34 views

Ubuntu VS Windows partitioning, 2TB limit

I have a server with a 3ware 9690sa-i8 raid card installed. I have configured a raid with a size of 12TB which i would like to use for Windows. It seems whenever the partition table is MSDOS the limit ...
0
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2answers
70 views

Adding additional disks to HP P2000 SAS Storage

We have a 12 bay HP P2000 SAS Enclosure with 6 drives on RAID 5 installed. The drives are configured as 2 separate DataStores for a VMWare vSphere ESXi setup. Now we want to add: 6 additional ...
3
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2answers
105 views

Software RAID 10 not any faster than s/w RAID 5 on Ubuntu 14.04 box, why?

We are doing some tests on a new database server with 4 x 240 GB SSD disks. From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy. However when ...
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2answers
40 views

Create an MBR on secondary plex

I have a HP Proliant ML350 g6 server running windows 2008 std R2. This server had two hardware arrays in it. One array was a raid 0 with 1 physical drive running raid 0. The other array is 5 physical ...
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0answers
24 views

Improve read performance on ext4 on Centos with software raid1? [duplicate]

I'm running a number of MongoDB nodes on dedicated servers running Centos6. Each machine has two SSDs which I have in Raid1 with two logical partitions: # df -h Filesystem Size Used Avail Use% ...
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3answers
60 views

Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens?

Is a BBU necessary when you have A+B power? Would the data on the RAID Card Cache and Drive Cache be lost when a kernel panic happens and you are forced to do a cold reset?
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1answer
53 views

3ware 97504i - Disk mappings/UUIDs change on reboot

I have a 3ware 9750-4i with 36 drives running (4 in RAID 10, rest individual drives, i.e JBOD). When I reboot, all the drives except for the RAID 10 array, have their UUIDs changed on reboot (it ...
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2answers
44 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 ...
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2answers
90 views

QNAP ts-1679u-rp RAID 6 rebuild with wrong order

I have a qnap ts-1679u-rp running on RAID 6. It has 2 disk error. Therefore, I replaced the 2 disk (Disk 3 and Disk 13) with new disk of the same model and capacity. It failed to rebuild. 1. I tried ...
3
votes
1answer
43 views

When does a Raid restore redundancy after a broken sector is flagged as defective?

What happens when I flag a sector on a hdd in a RAID setup as `defective (GLIST) ? Will the data be written to the replacement sector right away or does this depend on the actual setup/settings ...
2
votes
1answer
76 views

Combine 2 logical raid 0 drives to 1 logical raid 1 drive

I have an HP Proliant server with an P410i embedded array controller. The server was originally setup with 6 physical drives with the OS on 1 logical drive with a raid 0 and 5 physical drives setup ...
1
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1answer
48 views

Ubuntu server becomes unresponsive on hard disk issues despite raid setup

I am running a server on Ubuntu 10.04.4 LTS (Linux xxxx 2.6.32-67-server #134-Ubuntu SMP Wed Sep 24 18:55:00 UTC 2014 x86_64 GNU/Linux) with two hard discs in a software raid 1. I repeatedly had the ...
1
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0answers
36 views

Clone a CentOS VM on IBM x3650M2 server using Clonezilla

First off very thanks to everyone for this portal. What is am trying to do is to clone a CentOS virtual machine in VMware Workstation 10 to a physical hdd on an IBM System x3650 M2 (It's a 2U Rack ...
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2answers
31 views

What does “Array” refer to in a RAID controller?

This might be a very simple question. Could anyone please explain what the "Array" refers to when it comes to a RAID controller. I have tried searching for it, and I'm just getting more confused.
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0answers
20 views

Boot from ISO on Remote Server with RAID (Ubuntu)

I have tried to boot from an iso file with GRUB but it does not work. The problem is that grmf-rescueboot and other standard systems don't work with a Software-RAID (mdadm). So how can I boot from an ...
0
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0answers
50 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 ...
4
votes
1answer
113 views

Partition alignment on MegaRAID RAID 1 with 4k sector (advanced format) drives

I want to setup RAID 1 (mirroring) on a LSI MegaRAID SAS 8708EM2 (1078 chipset) with 4k sector (advanced format) drives. To the best of my knowlegde the controller does not officially support 4k ...
3
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3answers
216 views

How do I monitor RAID status when using an external eSATA RAID5 SATA port multiplier?

I am using an external eSATA device which takes 5 SATA drives and presents them as one large HW RAID5 to linux (ubuntu). It uses a SiI3726 chipset. Linux sees and handles the sata device just fine, ...
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2answers
39 views

Manage large disks in Windows 2012

We have a shining new server with 5 6Tb disks. We don't have physical access to it, so any "in BIOS do X" stuff is out of the question. I have been "forced" by the web interface of my to pre-format ...
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2answers
88 views

Would 6 SSD's in RAID 0 last longer than a single large SSD? [closed]

To my understanding, the main factor for SSD's to fail is constant reading/writing to the drive. I recently helped a friend setup RAID with 6 SSD's. Would this theoretically extend the lifespan of ...
1
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1answer
124 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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votes
1answer
91 views

How to add software RAID-1 to an existing system?

I couldn't find any tutorials for converting a non-RAID Linux system (Ubuntu 14.04 in my case) into a disk-level RAID-1 system after installing a second disk (/dev/sdb) Is the following correct? ...
1
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1answer
35 views

3ware 9500 stopped showing up in Linux

I was contacted by a client about this system that they're having trouble with. As the system boots, I can hit ALT + 3 to enter the 3ware bios and it shows the drives are available in an exportable ...
0
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1answer
38 views

Analyze SMART self-test for broken disks [closed]

I recently came home from vacation only to wake up the following morgon with two disks in my RAID5 array marked as faulty. I was able to start the RAID by forcing it to use the faulty disks and run, ...
3
votes
1answer
360 views

Very slow disk performance on HP P410 with RAID1+0

I have HP Microserver N54L, until recently i have used integrated software raid without problems. I have 2x WD Black and 2x WD Red (non-pro) disks for my raid array. I also have SSD directly on the ...
4
votes
1answer
31 views

Media_Wearout_Indicator at 043 - Reason to be worried?

I have a server running with two SSD disks in RAID1 and both drives report a Media_Wearout_Indicator at 043 from smartctl. 233 Media_Wearout_Indicator 0x0032 043 043 000 Old_age Always ...
6
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1answer
277 views

How do you connect more than 4 drives to a LSI 9361-4i MegaRAID controller?

I’m fairly new to proper hardware RAID having only used it in pre-built server machines before, but on the recommendation of some friends who work for datacentres I’ve bought an LSI 9361-4i MegaRAID ...
0
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0answers
70 views

How is it possible for reallocated sector count to decrease?

The reallocated sector count of a disk in a RAID array has been increasing over the past 6 months, but now it seems as though the reallocated sector count has decreased. A month ago (according to ...
0
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1answer
86 views

Debian server not booting after software RAID-1 array degraded

So I have a Debian 7 server with 3 hard drives. Its RAID-1 is basically configured this way: md0: sda1, sdb1 --> / (root) md1: sda5, sdc1 + sdb5 (spare) --> /data (sdc1 is on a SSD, and sda5 is ...
0
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0answers
20 views

Server drives gives input/output error when formatting in Fedora

I am at a total loss as to why this is happening. I have tried everything I can think of. I am trying to format a drive in Fedora to use in the server. Every time I try to format it I get a ...
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1answer
36 views

Possible to cascade HP StorageWorks P4300 G2?

From my understanding HP StorageWorks P4300 G2 is intended to be multiplexed over 1Gb ethernet when used as a SAN, where half of them should be in a remote location. If all 4 are next to each other, ...
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1answer
42 views

Detect faulty drive in RAID 10 array

I've been told that I can only verify my HW RAID array is working perfectly with KVM. However, I want to be automatically notified when there is a problem by my server. Is there a way via SSH (that ...
4
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1answer
104 views

Measuring SSD wear out behind LSI MegaRAID controller?

I'm trying to find out how to measure the total bytes written (or a percentage of maximum expected, either is fine) for a few RAID arrays behind LSI controllers. The controllers are all LSI MegaRAID ...
2
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1answer
166 views

Can a RAID array be moved from a HP P410i to a Dell Perc S100?

I have a HP Proliant ML350 G6 server with a HP P410i controller that failed miserably after a power spike. Can I move the RAID10 array to a Dell PowerEdge T310 with a Perc S100 controller without ...