Tagged Questions

A snapshot is a copy of data taken at a specific point in time.

learn more… | top users | synonyms

0
votes
1answer
512 views

An LVM snapshot of an ext4 fs does not seem very clean

I create an LVM snapshot of a mounted ext4 fs: lvcreate -L 10GiB -s -n "root-snapshot" "/dev/myvgname/root" If I then run e2fsck on /dev/myvgname/root-snapshot, it says: e2fsck 1.42.5 ...
1
vote
1answer
239 views

Qcow2 backing image and overlay idea

I have 2 KVM servers running Windows Guests. I want to create a Qcow2 image with Windows 7 on it, install the base software needed, and then make that a backing image, read-only, with one qcow2 ...
0
votes
1answer
148 views

Mounting an LVM snapshot and converting file: is it safe?

I have KVM running and need to convert some qcow2 disk images from running guests into vmdk format. Is it safe to take an LVM snapshot of the logical volume that the qcow2 file resides on, mount it, ...
0
votes
1answer
221 views

Clone/Backup Strategy for VMs between ESXi and KVM requiring clones to run concurrently with original VMs

I am stuck on this problem and need help. ESXi Free version 5 and qemu-kvm/libvirtd version 0.10. I will put the TL;DR first since it captures the problem fairly well. TL;DR I have 2 VMs on a KVM ...
0
votes
1answer
503 views

Qcow2 converted to vmdk show as spare and can't be snapshot

As the title says, kvm disks that I converted and moved to ESXi are useless because I cannot use snapshots due to the fact that they are sparse disks. Does anyone have a resolution for this issue? ...
1
vote
1answer
329 views

Is it safe to delete this snapshot?

Building on a previous question I had asked re: a VM freezing at the end of the backup, one of the solutions Veeam has offered is to make sure that there are no other snapshots that exist of that vm. ...
0
votes
2answers
185 views

ESX Free: Creating clones of VMs to run concurrently as a branch version

I have ESX free (most recent version 5.X) installed on a standalone server with an internal datastore in a RAID 5 setup. The VMs will be Windows mostly with some Linux and will be dedicated to ...
6
votes
2answers
290 views

VMWare/ESX Snapshots vs Libvirt snapshots vs LVM2 snapshots

In VMWare, when a snapshot is taken, my understanding is that it creates delta disks, and any writes that occur after the snapshot is created will be written to these new delta disk images, and not ...
0
votes
0answers
84 views

ESX: allowing users to snapshot VMs without vSphere Client Access

I am using ESX (latest free version 5.X) to host multiple VMs (mainly Windows with some Linux). Users will have control of these VMs and should be able to snapshot them, however I don't want to deal ...
-5
votes
1answer
120 views

best way to create lvm snapshot of / partition [closed]

I need to know the best way to implement the snapshot of root partition "/" on a kvm guest. What I have is as follows 1- /dev/vda ..... 10G free -- /dev/vda1 boot partition (ext - 83) -- ...
0
votes
1answer
86 views

Can i have 400 snapshots in Amazon Ec2 if they are incremental only

I want to know about snapshotting. Amazon says that they make Incremental backups Only charge for the data chnaged between snapshots Now my question is let us suppose the only data which change ...
2
votes
2answers
652 views

Server Backup Strategy for Amazon EC2

Where and how should I backup my EC2 / EBS based snapshots OUTSIDE of EC2? EC2 provides a great product with their EBS based snapshots. However it is also a high risk point that someone could ...
-1
votes
1answer
49 views

Switching Applications server on different VM snapshot

I have a VMware VM running with a specific Application Server. Instead of creating a new VM for install a new application server, Is it a good practice creating a snapshot of old Application Server ...
7
votes
2answers
556 views

Does speed of ZFS snapshot rollback depend on number of files?

I have tested a 10Gbit connection between two hosts to be able to read a 10GB file from host1 and write it to host2 using netcat, where the speed was 410MB/s. When I ZFS send/receive again with ...
6
votes
2answers
621 views

What does zfs receive -F do?

When I read man zfs for zfs receive I see -F Force a rollback of the file system to the most recent snap- shot before performing the receive operation. If receiving an ...
-1
votes
1answer
324 views

Hyper-V Missing Virtual Server From Hyper-V Manager List

We are running Hyper-V on a Window 2008 server that doesn't have a desktop (only console login is provided). We access Hyper-V using Hyper-V Manager which connects to this host-server and it provides ...
0
votes
1answer
50 views

Is it possible to quiesce a snapshot of a running server on an Esxi and back it up to a remote network several times a day?

There's an outside consulting company claiming that they are taking a snapshot of our local servers which reside on a VMWare Esxi, 4 times a daily while our servers are running. This snapshot is then ...
2
votes
1answer
342 views

Multi-Generation Snapshots using Device Mapper (Linux)

LVM is an amazingly useful tool, however, it seems to still lack support for snapshotting a drive that is already a snapshot. I made a script to handle this automatically but ran into some troubles. ...
2
votes
2answers
2k views

Quickest way to merge snapshots in VirtualBox

I have vdi with quite a number of snapshots taken from it - say, 50 or 70 snapshots. I want to have one plain vdi with a current state. These snapshots take way too much disk space and are not needed ...
2
votes
3answers
127 views

vmware 5.1 Upgrading and Snapshots

I'm planning on upgrading my environment to vmware 5.1 soon and was wondering if anyone here might know anything regarding snapshots taken prior to the upgrade: Will I need to take a snap shot after ...
0
votes
1answer
182 views

Snapshot a KVM guest with non-file storage

I am preparing at least one Windows 7 guest on a KVM Linux (ubuntu) host. I have made an LVM-based storage pool which I would like to use. My main concern is snapshots. The disk-image will be ...
0
votes
1answer
180 views

lvconvert --merge how to undo?

I have created a script for users who work on KVM virtual machines to be able to perform lvm snapshots on the logical volumes where their VMs are installed. Snapshot restores are performed via ...
0
votes
1answer
74 views

LVM Snapshot confusion

I think I understand some of the lvm snapshot concept, but am confused about one last thing. After you take the snapshot, if you don't mount it, will it be active? What I really want to know is will ...
1
vote
4answers
1k views

What does an LVM2 Snapshot contain? [duplicate]

Everything I read makes me think an lvm snapshot is a direct copy of the logical volume that was snapshot(ed), but how can that be when it takes 10 seconds to snapshot a 90 gig logical volume? If I ...
1
vote
2answers
2k views

How to determine optimal size for LVM snapshot?

I'd like to create a backup script that uses LVM snapshots during backup. This script will run on several Linux machines. I'd like to avoid creating snapshot that is too small and gets full during ...
1
vote
3answers
3k views

Is it possible to copy a snapshot and associate it to another VM (which has same configuration)?

I am having two virtual machines with same OS and software list. (In fact they were cloned). Now I have installed an application in a VM and taken a snapshot. Is it possible to copy this snapshot ...
5
votes
2answers
438 views

What are the tradeoffs between using hypervisor- vs. storage-array-based snapshots as backup sources?

Suppose you have some virtual machines (running in eg. ESXi) that are stored on an iSCSI storage array (eg. EqualLogic PS4110). Now suppose you want to set up a backup and restore regime that looks ...
1
vote
1answer
111 views

How do I sync disks in a Windows guest before doing a snapshot?

In general, before doing a disk snapshot of a virtual machine instance, the disk has to be synced to ensure that all buffers have been written to disk. If the guest operating system is Linux, you can ...
2
votes
0answers
99 views

Windows WMI get a snapshot EnabledState

I am trying to get the EnabledState of a virtual machine snapshot using WMI. That is I try to get the EnabledState that was current for the virtual machine when the snapshot was taken. So far I know ...
2
votes
1answer
193 views

LVM+MongoDB. Dropping in speed of backup creation

Till recent time we have been making mongo backups archiving LVM snapshot on hidden SECONDARY server with RAID10 on SAS disks. Currently operation on making snapshot from volume with 500 Gb of data ...
1
vote
1answer
3k views

export XenServer snapshot as file via console

I have created a snapshot of a Citrix XenServer virtual machine using XenCenter, and now I would like to save this snapshot as an *.xva file, just as if I right-click on the snapshot icon in XenCenter ...
3
votes
2answers
4k views

How to hot backup/snapshot an ext4 partition (in the absence of LVM)?

I'm currently tasked with bringing up a existing server to (at least more) professional standards - with as little disruption as possible to end-users. To have a proper rollback, I need to backup the ...
2
votes
1answer
556 views

I can't mount a LVM snapshot on a XEN host

I'd like to backup my XEN VMs by copying-rsyncing a LVM snapshot. I'm trying to mount a snapshot that contains a XEN guest's virtual disk (ext4). Below are all the steps I follow. I can't mount the ...
1
vote
2answers
3k views

Snapshot copy a VM to USB attached to ESXi 5.1 host

I was trying to script a snapshot backup of running VMs to a USB drive attached to the host. We are using the free hypervisor version of ESXi and do not want to purchase 3rd party products to do this. ...
4
votes
1answer
245 views

MongoDB Disaster Prep on AWS

I'm looking for best practice advice covering MongoDB disaster recovery within an AWS hosted environment. Our setup is fairly standard at this point, replica set of 3 servers (1 primary, 1 secondary, ...
0
votes
2answers
1k views

Hyper-V snapshots exist after Shut Down

I'm running a virtual machine (hyper-v) on an Windows Server 2008 R2 64-bit machine. I want to increase the hard drive size but the edit button is not enabled. The notice says "...snapshots exists ...
0
votes
1answer
102 views

Cloning instance - Original kernel not available when creating AMI

I have a EC2 Ubuntu server on Amazon cloud and I'm trying to clone an instance "X" by creating a snapshot of the instance and creating an AMI from that snapshot. The problem is: When creating the AMI, ...
3
votes
2answers
1k views

Checking for orphaned snapshots - ESXi5

So we had some issues with our passive mail node over the weekend doing vmtools updates and to resolve a problem we had to revert to a snapshot and then reseed all the databases across. All in all ...
1
vote
0answers
320 views

Samba 3.5 Shadow Copy for Windows 7

Over the past several days I have been trying to get the shadow to work with samba but haven’t been successful. Can someone check below config and let me know if I am missing something? We are using ...
2
votes
1answer
788 views

vSphere Replication Guest OS Quiescing

I am using vSphere Replication 5.1 to send virtual machines to a separate datastore every 24 hours. One option in configuring each VMs replication is the Guest OS Quiescing option. Options are None ...
1
vote
1answer
219 views

XenServer and Quiesced snapshots

At work we use XenServer to administrate all the VM's. Now I wrote a script which enables Linux machines quiesced support. The script works absolutely fine. It activates if someone triggers a quiesced ...
5
votes
2answers
2k views

Correct process for starting new EC2 Instance from an EBS snapshot

I have an EC2 instance running the Ubuntu 12.04 32bit AMI (available in the first page the Classic wizard for launching a new instance). The root device is an EBS volume. I then follow these steps: ...
0
votes
0answers
88 views

Creating a snapshot of an attached EBS volume is not working

I'm trying to create a snapshot of an 8GB volume attached to another instance whose device is named sdh5. I originally created this volume myself and mounted it as an ext4 filesystem. Now I'm trying ...
4
votes
5answers
8k views

How do I delete ESXi vm snapshots using the least additional space possible?

We have a tree of about 15 snapshots of a virtual machine that runs Win2k8, as you may guessed our datastore is soon to run out of space. My objective is to delete all the snapshots, as it seems it ...
1
vote
3answers
77 views

Revert a VM client from within the VM Client - is it possible?

I am creating a test VM (esxi V5) client for our QA department. Once it's installed, my options will be: Use a snapshot Use non persistent disk on the hard disk. For either options, I can give ...
2
votes
2answers
776 views

backing up MySQL living on a SAN using LVM snapshots. is this doable?

So I was looking into LVM snapshots and it seems like a feasible method for backing up mysql so that it's at least crash consistent. My issue is that I have mysql servers where the mysql data ...
2
votes
2answers
828 views

Export snapshot from VMWare Workstation 8

How can I export a virtual machine from VMWare Workstation 8 to another physical computer which has VMWare Workstation 8? i.e. how can I move snapshots between different instances of VMWare ...
4
votes
1answer
6k views

Robocopy, do not overwrite existing files, but copy the changed / new ones

Is it possible to mirror the two directories without overwritting the files in destination directory with new/changed/deleted files. Something like snapshots. Example: Copy the source directory with ...
12
votes
4answers
6k views

Why VM snapshots are affecting performance?

I read in one of the VMware KB article says that snapshots will directly proportional to VM performance. But my team keep asking me how snapshots can affect performance. I would like to give them ...
-4
votes
3answers
373 views

VMWare software that support snapshots [closed]

I need to run some VMs But it seems like VMWare Player doesn't support snapshots. Is there any other free software from VMWare that support snapshoting? PS: I know that Oracle VirtualBox can do that ...