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• mdadm auto grow raid

  - by johannes

  I have a raid0/1 on lvm logical volumes. I resized the logical volumes. Now I want to resize the raid to use the complete logical volumes. This can be done with mdadm /dev/md? --grow -z newsize But somehow I can't figure out how to calculate the newsize argument. Is there a way to tell mdadm to grow to the biggest possible size? If not, how do I…

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• Is there any way to do 'software raid' without losing data?I

  - by user1706582

  I say software raid because that is a pretty tentative guess at what I actually want. I have two drives, both with stuff already on them which I want to combine. If they weren't full of stuff (data, not windows installation) I would use software raid to combine them into one big drive or make them into one partition. I could probably do this with…

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• usb vs firewire for connecting two RAID 0 disks

  - by Arne

  I have a 2TB and a 4TB RAID 0 external drives (both have two physical hard drives in them). Both have a FW800, FW400, and USB port. My MacBook Pro has one FW800 port and two USB ports. I want to copy data from the 4TB drive to the 2TB drive. Is it better to A - connect both directly to the laptop, one with USB and one with FW800 or B -…

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• RAID 50 24Port Fast Writes Slow Reads - Ubuntu

  - by James

  What is going on here?! I am baffled. serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd if=/dev/zero of=/Volumes/MercuryInternal/test/test.fs bs=4096k count=10000 10000+0 records in 10000+0 records out 41943040000 bytes (42 GB) copied, 57.0948 s, 735 MB/s serveradmin@FILESERVER:/Volumes/MercuryInternal/test$ sudo dd…

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• RAID P410i and P812 performance issues

  - by Alexey

  I'm having much trouble with I/O performance of HP DL360 server with two RAID controllers - P410i and P812, Windows Server 2008, 36 GiB RAM and 16 x Intel Xeon x5550. The server runs a bunch of tasks producing heavy sequential I/O, and after about 20-30 minutes of intensive work it looks like the tasks are stuck, not using CPU…

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• How to create Raid 10 with megacli

  - by Henno

  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 figuring out the correct command line for creating a raid 10 array. The documentations says that the syntax for creating a raid…

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• High I/O latency with software RAID, LUKS encrypted and LVM partitioned KVM setup

  - by aef

  I found out a performance problems with a Mumble server, which I described in a previous question are caused by an I/O latency problem of unknown origin. As I have no idea what is causing this and how to further debug it, I'm asking for your ideas on the topic. I'm running a Hetzner EX4S root server as KVM hypervisor. The…

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• What is "2LUN" mode in connection with RAID?

  - by naxa

  I've came across RAID products that also list JBOD (just a bunch of disks) mode and 2LUN mode. What the heck is 2LUN mode? I could not find a description; the closest thing seems to be LUN 'logical unit number' but I don't get the 2LUN thing. UPDATE 1 This is what Wikipedia has to say about JBOD: JBOD (derived…

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• "Verifying DMI Pool" hang caused by raid array..

  - by Ling

  Hi Experts, I have a problem, I obtained a new server with 4 hard drives (2 500 gig, 2 two TB), and an adeptec RAID card. I arranged them in two arrays with RAID 1 (500 gigs together as primary and the 2 TB drives for lots of data). When both arrays are configured, the server hangs while booting at message…

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• CentOS - Add additional hard drive raid arrays on Dell Perc 5/i card

  - by Quanano

  We have a Dell Poweredge 2900 system with Dell Perc 5/i card and 4 SAS hard drives attached, with NTFS partitions on them. We installed CentOS on one raid array on this controller with a different controller and it is working fine. We are now trying to access the drives shown above and they are not being…

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• HP Proliant DL360 G5 + MSA50 RAID Setup recommendations

  - by JohnRB

  I am running a HP Proliant DL360 2 x 3GHz Xeon 16GB Ram P400 integrated RAID card with 6 x 73GB SAS HDDs running Ubuntu Server 14.04 CLI only. I recently got my hands on a MSA50 SAS Enclosure (10 x SAS HDD bays w/ SAS in/out interface) and wondering what you guys recommended as far as an addon raid…

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• How to perform fresh linux install while preserving software raid and user accounts

  - by slayton

  I have a system with two software raid arrays. The OS is Ubuntu 9.04 and is no longer receiving updates. I'd like to update the system to 12.04 rather than trying to do the automatic update from 9.04-> 9.10-> ... -> 12.04. My main drive has 2 partitions that are mounted at / and /home. …

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• How to reassign drive back into MediaShield (nvidia) RAID stripe

  - by scottwed

  So I managed to inadvertently remove the RAID configuration from 1 drive of a 2 drive stripe. I have both drives, unmodified, and undamaged. Specifically for MediaShield RAID, is there any way to reattach the 2nd drive back into the stripe? Current state is the stripe is displayed in Error…

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• Remote RAID Control in ESXi on a Dell PowerEdge 2950 Using OpenManage

  - by yoyomommy

  I was wondering how one can add a drive into an existing RAID array while ESXi is still running. I have read that you are able to use Dell OpenManage to do this. I have installed OMSA 7.0 on the VMWare ESXi host (5.0 and fully updated) and I've installed OpenManage Essentials on a …

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• Software/FakeRAID: Windows 8 Disk Mirroring vs Intel Onboard

  - by Johnny W

  So Windows 8 is out and I have a new motherboard. I wish to create a RAID 1 coupling between two HDDs -- for storage purposes only (my OS is on an SSD) -- but I don't know which is the best route to take. My motherboard (Z77 chipset) comes with the age old Intel Fake RAID, but since I…

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• choosing the right RAID level for PostgresQL database

  - by Sergey

  Hi, I got an disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will be used solely by PostgresQL database and I am trying to choose the best RAID level for it. The most priority is for read performance since we operate large data sets (tables, indexes) and we do lots of…

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• GRUB2 UEFI booting from LVM on RAID (with XEN)

  - by pavian

  I'm experimenting with booting root fs from LVM volume inside the raid (mdraid superblock 1.x) via UEFI with GRUB2. Also I'm using Xen hypervisor. From grub command line I can see my lvm volume (ls command) but I got kernel panic due to "unable to mount root fs". I saw a note in this…

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• Dell Power Edge R515 - Replacing a Bad Hard Drive in a RAID

  - by LonnieBest

  I've ordered a new hard drive to replace a bad one in a Dell Power Edge R515. The manual covers obvious topics regarding physical replacing of hard drives, but I've never done this before on a production server where RAID is involved. I've heard people talk about this topic, and…

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• Hardware RAID 0 without OS re-installation

  - by sterz

  I have Ubuntu & Windows 7 installed on my hdd. Can I mirror the image of the hdd to the second identical drive? Is this not recommended (i.e have to re-install every OS)? If it is okay to mirror, is there anything else to do to make hw RAID 0 work? Does RAID 0 have the same…

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• growing EBS RAID volume

  - by Ryan Fernandes

  I've created a RAID0 configuration with two 1GB EBS volumes, mounted at /dev/md0 using mdadm and formatted with XFS Next, I copied some files over to fill the volume to around 30% of its capacity (of 2GB) I then created snapshots of the volumes using ec2-consistent-snapshot and…

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• Benefits of a RAID BBU in addition to a double UPS + PS system

  - by Wikser

  Today I roughly measured the benefits of enabling write-back on the RAID controller on a server at work. It got no RAID battery-backup-unit (BBU) so the write-cache is currently disabled. As the server is not used to capacity (by far), the results in most test were spectacular,…

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• HighPoint RAID Controller can't see drives

  - by Satellite

  I've just built a system with a HighPoint 2720 RAID controller. Everything appears to be OK, except that the controller doesn't see any of my drives - the RAID BIOS displays "ERROR. No Suitable disks". I have tried a WD SATA, Seagate SATA, and OCZ Vertex 3 SATA. I am using…

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• Raid1+0: create stripe over two /dev/mdx on partition or not?

  - by Chris

  Given that I haven't found a way to define how a Raid10 is created with mdadm, i went the Raid1+0 solution. How to display/define Mirror/Stripping pairs with mdadm mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdf1 mdadm --create /dev/md1 --level=1…

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• Most efficient RAID configuration with 6 disks?

  - by Bob King

  I have a hand-me-down server that I'm setting up at home and it's got 6 72Gb hard disks (as well as 2 18Gb drives that I'm using for the OS). What is the best way to configure those 6 drives? Should I RAID 5 or 6, or go with something simpler, like mirroring? I'm…

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• RAID 1 in ubuntu 12.04

  - by Bavly Hanna

  Right now I have a small file server to which I have loaded ubuntu 12.04 desktop on a small 160gb harddrive. This harddrive is the primary drive from which the OS boots. I want to move all my data to my file server so it can be shared on the network (contain in…

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