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Questions tagged [snapshot]

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

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

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Safe to Use an Amazon EBS Volume While Snapshot in Progress?

Is it safe to use an EBS volumne while a snapshot is being created? I've currently got a 100Gb EBS volume mounted. I am in the process of snapshotting it. Goodness it's slow!! It's going to end up taking more than 45 minutes to snapshot. My…
Justin Noel
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LVM snapshots vs. file system snapshots

As far as I know, LVM makes it possible to take snapshots of a volume. There are also a number of file systems (ZFS, Btrfs, reiserfs, ...) which supports snapshots. However, I've never understood the difference between LVM snapshots and file system…
nip3o
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4 answers

Why VM snapshots are affecting performance?

I read in one of the VMware KB articles that snapshots will directly affect VM performance. But my team keeps asking me how snapshots can affect performance. I would like to give them solid reason behind the statement the snapshots are performance…
Samselvaprabu
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6 answers

Why are snapshots considered as temporary backups not real backups?

I am using VMware ESXi. In our team we use to provide snapshots for long term backup. Then we faced issues like memory spillover and the server got hang up. I started reading in VMware knowledgebase articles and everywhere. Everywhere it was…
Samselvaprabu
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5 answers

Is this how LVM snapshots work?

I'm trying to figure out how LVM snapshots work so I can implement it on my fileserver but I'm having difficulty finding anything on google that explains how it works, instead of how to use it for a base backup system. From what I've read I think it…
Malfist
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AWS EC2 what is a reservation ID exactly and what does it represent?

I made a script that creates snapshots of our EC2 volumes. The script looks at which instances are running, which volumes are connected to those instances, and then creates snapshots for those volumes, ignoring the rest. Using describe-instances, I…
SPRBRN
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VMware Snapshot Longer than 3 days

Referring to this article https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1025279 I know it is not good practice to keep a snapshot longer than a day or two because the performance can degrade. The…
Anthony Fornito
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Do snapshots + RAID count as a good on-site backup solution?

The two main reasons I can think of for taking backups seems to be taken care of when I use both snapshots and RAID together with btrfs. (By RAID here, I mean RAID1 or 10) Accidental deletion of data: Snapshots covers this case Failure of a drive…
小太郎
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14 answers

Best compression for ZFS send/recv

I'm sending incremental ZFS snapshots over a point-to-point T1 line and we're to a point where a day's worth of snapshots can barely make it over the wire before the next backup starts. Our send/recv command is: zfs send -i tank/vm@2009-10-10…
Sysadminicus
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Is running permanently in a VMWare snapshot bad for performance?

I understand that the VMWare KB frowns upon long running snapshots mainly due to two things (In my opinion) Taking tons of snapshots can fill up the data store. Snapshots are simply delta files. Let's say you have a 50 Gig VMDK, near full, and…
VM_Storage_Inception
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4 answers

How to keep or drop LVM snapshot?

I have made an LVM snapshop by lvcreate --name snap --size 10G -s /dev/vg00/vm What command should I write if I want to drop the snapshot, and not keep the changes that have happened since the snapshot? And what command should I write to roll the…
Sandra
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6 answers

Commit or revert a Linux LVM snapshot?

I'm about to perform an experimental upgrade on my CentOS 5 server. If the upgrade fails, I want to be able to back out the changes to the filesystem. This scenario seems similar to the example in Section 3.8 of the LVM HOWTO for LVM2 read-write…
Shewfig
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15
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1 answer

Delete "orphan" libvirt snapshot

I am trying to live-snapshot using KVM as per this procedure. I must have messed up at some point because I'm in a state I don't understand. My VM is called prod. It was created in file /srv/vm/prod.qcow2. Apparently, there is no running snapshot:…
Jérôme
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15
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1 answer

Incredibly slow snapshot removal

I have an ESXi box with HP LeftHand storage exposed via iSCSI. I have a virtual machine with a 1TB disk, of which 800GB is consumed. The disk is thick provisioned on the LeftHand storage. A snapshot was open on the VM (so that Veeam Backup and…
Mark Henderson
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Why are all of my ZFS snapshot directories empty?

I'm running an Oracle 11 box as a ZFS storage appliance, and I'm taking regular snapshots of the ZFS filesystems, via cron. In the past, I know that if I wanted to grab a particular file from a snapshot, a read-only copy was kept in…
growse
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