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Questions tagged [raw-disk]

31 questions
7
votes
2 answers

DRBD on raw disk block device

I try to setup DRBD on a raw disk device /dev/sdb without partition table, nor LVM stack PV/VG/LV As this disk is virtual and hypervisor I use allow on-the-fly disk extension, I do not want to bother with LVM operations or re-partitioning when comes…
Yves Martin
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5
votes
6 answers

How do I add a physical (raw) disk to a virtual machine in VMware Server 2 on a Windows host?

I have a Windows 64-bit host running VMware Server 2. I need to create VMs that will use the raw partitions for my Linux and Windows XP installations. Older versions of VMware had an option to add a raw disk, but VMware Server 2 only allows me to…
Rob
3
votes
1 answer

KVM guest doesn't recognize new size of raw disk after lvresize

I extended the /home LVM volume for my KVM guest by 500G via lvresize -v -L +500G /dev/engi/v-sbuild-home and rebooted my guest system to update the available disk space. After the reboot I wanted to use resize2fs to enlarge the home partition on…
HibikiTaisuna
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3
votes
2 answers

Backup of KVM raw-images

I'm running qemu-img-0.12.1.2-2.355.0.1.el6 on CentOS 6.3 using raw images for my virtual machines. Is there any way to safely backup guests, without stopping them? I've tried to make snapshot on a test guest, that wasn't running but got an error:…
fume-shroom
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3
votes
2 answers

Raw copy with sector precision on windows

Is there some program for windows that is able to do what dd does in linux out of the box? I need to copy from a file to a physical disk in raw mode where I need to define offsets for input and output. So for dd, I'd need to use the seek and skip…
user462982
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3
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2 answers

ESXi Accessing LUNs: Physical or Virtual Mode?

I'm building VMs in my lab and I want to replicate the situation that my fileservers will be encountering in production. Here's a brief overview of what I want to do. I have multiple ESXi 4 servers. They are accessing a SAN, and each virtual…
Matt Simmons
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2
votes
2 answers

strange raw device perfromance on Aerospike ASD 3.15.1.4

I have a cluster of 4 servers. One of the namespaces is raw device based. The devices reside on a SAS mechanical hard drive. Now here is the weird part of the story. I am running one of the tests with small records (2x50 bytes = 100 bytes total). I…
Boris Epstein
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2
votes
2 answers

Create "raw disk file" from WIM file

First timer here. I've searched around here, but haven't found a question like the one I have. Apologies if I missed it. The challenge at hand: produce a "raw disk image file" from a given WIM file. What I am pursuing so far is to use imagex.exe…
joebalt
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2
votes
1 answer

RHEL raw device (over VMware RDM) performance issues

I'm running RHEL 5.3 over vSphere 4.0U1. I configured multiple LUNs on my NetApp (Fibre) storage, and added the RDM on two (Linux) VMs, using the Paravirtual SCSI adapter. One LUN is 100GB in size, successfully mapped to /dev/sdb on both VMs, 5 more…
jifa
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2
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1 answer

Can I directly write to AWS EBS raw volume

I want to write data directly to an unmounted raw EBS volume (with no file system) using system calls. 1) Can I can do this via the EC2 instance to which the EBS is connected? 2) Can I provision raw EBS volumes without having an associated EC2…
swami
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1
vote
1 answer

iSCSI Target drive turned RAW format

I have an iSCSI Target drive that was working fine after creation for a few days. After i copied about 40GB of data to it i lost access to the drive. the file system had changed to RAW and windows wanted me to format. I did not format but was able…
Khalid Rahaman
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1
vote
1 answer

ESXi 5 doesn't recognize Raw disk image

I created a 60 GB raw disk using qemu-img convert, and qemu-img info confirms it is a raw file format. It worked fine in KVM. When I go in ESXi to create a new VM from existing virtual disk, and browse to the disk in the datastore, it is not…
user160910
1
vote
1 answer

poor performance with vmdk mounted as loop device even after conversion to raw

Edit 13/12/12 - At this stage it would appear to be related to Western Digital (and possibly others) Advanced Format 4K block sizes. This link goes some way into describing the issue, however the disk I have reports 512 logical and 4096 physical…
jelloir
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1
vote
2 answers

Scan raw block device data for known file types on linux

I'm looking for a way to search a raw block device for file type patterns on linux. The partition type is known and the partition table exists. I want a linux based (open source maybe?) programm that allows me to search for known file types (by…
omni
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1
vote
3 answers

does KVM raw images support preallocation?

I was trying to create a raw image with this command: qemu-img create -f raw -o size=200G,preallocation=metadata file.img but seem that it raw images doesn't support preallocation. if so why there is raw + preallocation in this chart? # qemu-img…
Zim3r
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