Tagged Questions

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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Improve read performance on ext4 on Centos with software raid1?

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
45 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
40 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
36 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
35 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
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1answer
36 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 ...
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0answers
16 views

Postgresql on several disks [on hold]

I have got ubuntu 12.04 server with database(postgresql). There are two ssd disks for database. Application can use sharding data for several postgresql instances. I see two solutions for it: 1) ...
2
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1answer
49 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 ...
4
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0answers
37 views

Is it safe to stop a RAID 5 expansion? [migrated]

I'm having some issues expanding a RAID 5 array on a Synology DS413. The drive has gone from 3 x 3TB WD Green drives to 4 x 3TB. I started an expansion operation and it's been stuck at about 60% and ...
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0answers
34 views

HP Smart Array P410 Firmware v6.00 Boot Loop [closed]

I have an ASRock H77 Pro4/MVP Motherboard with the HP P410 Connected in i am stuck in a boot loop it detects the card loads the card ROM and spins Initializing. Then it will show 1 Logical Drive ...
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1answer
26 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 ...
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0answers
20 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
29 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
18 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 ...
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0answers
34 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
62 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
votes
3answers
188 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, ...
0
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1answer
24 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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votes
2answers
70 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
vote
1answer
46 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
50 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
27 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
votes
1answer
31 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
175 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
28 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
votes
1answer
251 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
votes
0answers
37 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
votes
1answer
51 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
votes
0answers
11 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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votes
1answer
35 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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votes
1answer
40 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 ...
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votes
0answers
18 views

IBM X3650 New Raid Card [duplicate]

I have a quick question for you pro's of the hardware storage world. We have a few IBM x3650's with 6 hard drives, sadly the IBM 8k inbuilt card doesn't support 3tb and 4tb drives. I would like to ...
4
votes
1answer
72 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 ...
1
vote
1answer
145 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 ...
0
votes
2answers
34 views

Linux (Centos) soft raid1 - motherboard died

I use centos 6.3 and soft raid1 (via mdraid) + LVM. The problem is that MB died and I have several questions. I have two hard drives. Is it important what drive how connect to MB. I mean ...
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votes
1answer
35 views

Removing HDD from RAID 5 to pull data from

I have a relatively (I think) simple question... I have a file server with RAID 5 that is old and pretty much dead and I need to grab the data from it. I was thinking I could pull one of the HDD's ...
0
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0answers
55 views

Azure disk performance

I am running on-demand, research D14 instance in Azure South Central US region, with a 4-disk RAID0. Recently the disk performance has become unusably slow, particularly the RAID performance, which is ...
0
votes
1answer
62 views

How can I reduce LSI raid array without data loss

I have a server with 8x SAS drives attached to hardware LSI RAID controller (MegaCli64) and all 8 drives are configured as single RAID 10 array. I now want to remove 2 drives and replace them with ...
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votes
1answer
38 views

Command to check if RAID 1 or not? [closed]

I am a newbie on Linux. I buy one new dedicate server and now checking my hardware from CENTOS console. Could you tell me how to check if my server has an RAID 1 configured? many thanks
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0answers
36 views

To write in mdadm.conf in initramfs prompt doesn"t not save changes after reboot

I made a mistake with my mdadm.conf with my debian backup server. I used this command : mdadm --detail --scan --verbose >> /etc/mdadm/mdadm.conf to add a raid5 (it works great). By using ...
0
votes
0answers
8 views

SunFire 100 RAID setup failed

I have a SunFire 1000 and I would like to define the RAID. When I try to delete everything I get the error that there is not enough space: # raidctl -C "0.0.0 0.1.0" -r 1 0 Creating RAID volume will ...
2
votes
1answer
44 views

Placement of OS and SQL files

we are in process of setting up our SQL server which is clustered across 2 HP DL380p servers using a HP P2000 for the shared storage with 2 raid 10 (8 disks) arrays and raid 1 mirror (2 disks). We ...
2
votes
1answer
44 views

3ware: Add a drive to a RAID unit

I have a 3ware RAID controller running a RAID-6. I manage the RAID via the tw_cli command line utility. So, one drive in the array failed, and I removed the faulty drive (p6) from the array, and ...
0
votes
1answer
29 views

SBS 2003 Raid restore with fresh install

I have a box running SBS 2003 with one hard drive for the os and another three in a raid 5 configuration [edit: using the build in SBS raid system] The os hard drive seems to have died, even trying ...
2
votes
4answers
383 views

Raid 1 across 3 partitions, what does it mean?

I see a server with this kind of configuration. What does it mean? # cat /proc/mdstat Personalities : [raid1] md0 : active raid1 sda1[0] sdc1[2] sdb1[1] 48827264 blocks super 1.0 [3/3] [UUU] ...
2
votes
1answer
57 views

NetApp RAID DP - and disk space of parity drives

I've been reading: http://community.netapp.com/t5/Tech-OnTap-Articles/Back-to-Basics-RAID-DP/ta-p/86123 That basically describes RAID-DP as diagonal parity raid. But there's one thing that's ...
1
vote
3answers
63 views

distributing tables over multiple harddrives

Is there a performance improvement when I distribute database tables over different harddrives? I need to access many different schemas at the same time and I was wondering if adding more harddrives ...
0
votes
1answer
113 views

LSI MegaRAID - Recreate missing RAID 1 array

I have an LSI MegaRAID SAS 9260-4i Controller with two drives attached to it with a simple RAID1 array (virtual drive). One of the disks failed (complete disappeared from the system) so I asked the ...
1
vote
2answers
61 views

RAID 1 fault “ Status Ready for Rebuild : Rebuild Percentage Complete 0%”

Our RAID 1 system partition failed on our Windows 2008 SBS (physical environment). We still have disc 1 running but the 2nd disc in the raid is a failure. To add to the complication, disc 1 has bad ...
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0answers
102 views

Setting up a bootable multi-device (RAID 1) using Linux Software RAID

I'm trying to setup a bootable software RAID that will contain the root filesystem and boot up Linux Mint Qiana. It will be used to run a few graphical monitoring applications in a small datacenter, ...