20
votes
AWS EC2 what is a reservation ID exactly and what does it represent?
The ResearvationId has nothing to do with Reserved Instances. It is a unique value indicating a request to launch EC2 instances. A launch request may come from the cli, AutoScaling, or the AWS ...
- 10.2k
16
votes
Best compression for ZFS send/recv
Things have changed in the years since this question was posted:
1: ZFS now supports compressed replication, just add the -c flag to the zfs send command, and blocks what were compressed on disk will ...
- 1,306
16
votes
Accepted
How to know the snapshot completion time in AWS EC2?
The completion time is generally not important, as the snapshot is of the volume as at the time you request it, even if you change it while the snapshot is being made. It can take several hours, but ...
- 32.2k
12
votes
Accepted
How long will it take to create a new EBS volume from a 1TB snapshot?
How can I figure out how long it will take to create the new EBS volume?
Create one.
And then, try using it. Continue using it over a period of hours and days, and note what you observe.
The first ...
- 22.8k
9
votes
RDS snapshot: how long does I/O suspension occur?
The answer comes from understanding how snapshotting works.
At the start of a snapshot, a message (command) is sent to all applications to come to a consistent state and flush necessary data to disk. ...
- 4,834
8
votes
Accepted
How much space NAS snapshots consume?
Most NAS snapshots implement copy-on-write, so the snapshot itself initially takes up no space (or next-to-none, there is some overhead). But any block that is changed whilst the file it's part of is ...
- 80.1k
8
votes
Accepted
VMware Snapshot Longer than 3 days
How do other organizations deal with this?
I do more or less what you're doing. Keeping snapshots around for a few days for a specific reason isn't bad. You just need to make sure to not forget about ...
- 110k
8
votes
Accepted
How to set the number of snapshots zfs-auto-snapshot should retain?
Here is a sample of one of my system's /etc/cron.d/zfs-auto-snapshot.
PATH="/usr/bin:/bin:/usr/sbin:/sbin"
*/5 * * * * root /sbin/zfs-auto-snapshot -q -g --label=frequent --keep=24 //
00 * * * * ...
- 198k
7
votes
VMware Snapshot Longer than 3 days
In my opinion, the simplest way will be just to backup VMs regularly, as @EEAA mentioned before.
We have quite large amount of VMs running in our environment. So we configured backup Every 1 week. ...
- 5,080
7
votes
Accepted
AWS snapshot automation
You may have to look in CloudTrail to find out what IAM Role was used to create the snapshots. That should take you in the right direction - whether it's a CloudWatch role, EC2 role, or some external ...
- 25.1k
7
votes
Accepted
Google Cloud disk multiple snapshot schedules
Google Cloud supports only one "attached" snapshot schedule for persistent disks.
Creating scheduled snapshots for persistent disk
- 4,834
6
votes
Which filesystems offer snapshot functionality for users to recover data?
As of 2022, btrfs is considered stable for non-RAID setups, and it offers transparent and stable snapshots.
The top answer is from 2011 and mentions that both btrfs and ZFS are considered unstable. 11 ...
- 61
6
votes
Is this btrfs snapshot removal performance normal?
In the CoW world (BTRFS and ZFS, basically), removing a snapshot/subvolume require many "heavy" metadata operations, which imply many head seeks. This is due to the filesystem parsing its own ...
- 49k
6
votes
Accepted
How to do a snapshot of a Datastore on esxi vmware - datastore snapshot as fast recovery backup
Snapshots aren't backups! You really need to follow 3-2-1 backup rule to ensure your data is safe. To accelerate your tape backup and recovery process I'd suggest to go from Disk-to-Tape to Disk-to-...
- 13.8k
5
votes
Accepted
How Do I Remove Files Stored In a VMDK?
At this point, it's going to be much quicker and easier to restore this VMDK from the backup copy you hopefully have. Snapshots are delta disks, and by deleting the earliest one, you have probably ...
- 53.8k
5
votes
Accepted
Are EBS snapshots deleted when the volume itself is deleted?
When they delete the EBS volume, all the shapshots are also removed, right?
That is not right. Snapshots are not deleted when the source volume is deleted.
Any snapshot of a volume can be used to ...
- 22.8k
5
votes
Accepted
How do I make a VMWare VM not be running on a snapshot?
Why wouldn't "You are here" be at the top?
It's just the way that snapshot manager displays the snap-tree is all.
If you're happy with where your VM is right now then just delete all snapshots and ...
- 102k
5
votes
Scheduled snapshots wont run Google Compute Engine
I guess the issue is resolved now. It is working fine now. I also tried to do a small video on procedure to show how scheduled snapshot works... The YouTube link is https://www.youtube.com/watch?v=...
- 51
4
votes
Accepted
ZFS: very big files + compression + snapshots
You should be using ZFS compression (with compression=lz4) by default these days. There's no good reason not to use it, except if you know that your data is not compressible.
Snapshots on compressed ...
- 198k
4
votes
Amazon EC2 Snapshot corrupt
The snapshot is not corrupted. The filesystem that the snapshot contains is corrupted. There's a difference.
The filesystem in a snapshot can be corrupted if you take the snapshot while the ...
- 10.2k
4
votes
What is the best practice taking a snapshot VMWare
Is one way any better to perform for stability and safety net of the
snapshot?
If you require a guaranteed clean filesystem, you must either shut down the OS or ensure that the filesystem is ...
- 110k
4
votes
How to do a snapshot of a Datastore on esxi vmware - datastore snapshot as fast recovery backup
As BaronSamedi mentioned, to boost up the backup and recovery process you need to use Disk-to-Disk-to-Tape backup. For such case, Starwind VTL is the most suitable solution with an optional offload to ...
- 5,570
4
votes
Solaris 11 ZFS Snapshot vs. New Boot Environment
Boot environments are ZFS snapshots at their core. Best practice is to use boot environments to save a copy of the system before making any configuration changes, as reverting to prior ones is easy ...
- 41
4
votes
ZFS snapshot zd0 block device
Here's how to manage snapshots on an XFS on top of ZFS setup.
(a disclaimer: there are safer and more intelligent ways to store (ppro) data on ZFS)
Take a snapshot.
Identify the snapshot.
Clone the ...
- 198k
4
votes
AWS EBS snapshot. Does FileSystem consistency REALLY required?
Amazon snapshots by themselves are not safe if taken while a system is running. They are safe if you shutdown the system before creating the snapshot. Any file system data that is cached in the ...
- 4,834
4
votes
Accepted
Can a big VMware snapshot be deleted this way?
There is a really interesting article about performing safe removal of large snapshots on VMware. All credits goes to Ideen Jahanshahiand and his great blog post. Screenshots have been replaced on ...
- 1,193
4
votes
Accepted
Mongodb on AWS EC2 backup strategy
In general, do not trust any backup procedure until you have confirmed the integrity of a restore from long term media.
You already have the capability to take a storage system layer backup online. ...
- 32.6k
4
votes
Accepted
ZFS test rollback doesn't work as expected
You only snapshotted nvme-tank, but you didn't snapshot either of nvme-tank/ext4-zvol or nvme-tank/ntfs-zvol, one of which contains the file you created. So nothing happened because you were ...
- 246k
4
votes
Q: Unable to create 'live' snapshot of running KVM using virsh
I just ran into the same problem. It's an selinux issue: selinux (on the guest) is preventing the QEMU guest agent from quiescing the target filesystem. You can see a summary of the issue like this:
#...
- 44.1k
4
votes
Why a frozen snapshot of a LV is changing continuously?
LVM snapshots are copy-on-write. That means that when you create one, you instantly have a snapshot, but it is kept constant by the copy-on-write algorithm: When lvroot gets written to, the data to be ...
- 8,114
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