Gcloud compute snapshot of re-created disk is not complete?

I recently recreated a disk / vm image in google compute from a previous set of snapshots. Those snapshots are currently dated and sized as follows:

 - May 20     60 MB
 - May 21    372 MB
 - May 22    255 MB
 - May 23    118 MB
 - May 24     93 MB
 - May 25   1110 MB

After creating the disk I took the original source disk off-line (stopped the VM), made the new disk the boot disk, and started it. I then saved a machine image of it, and then did a manual snapshot. The new snapshot:

  May 25     16 MB

I don’t have an image to verify, but I’m fairly certain the original May 20 snapshot was 300+ MB.


  1. As subsequent snapshots obsolete parts of existing snapshots, are the obsolete files “taken-out” of the preceeding snapshot? I.e. the snapshot is uncompressed, pieces removed, and then recompressed?

  2. Why is the first snapshot of the newly created disk so small? It looks like it must be linked to the snapshot series of the disk from which it was created.
    Note: the snapshot schedule for the original disk was disconnected from it and re-used with the new disk.

  3. What happens to the snapshot of the newly created disk if the series from the first disk is deleted? Is it invalidated? Or are the originals “rolled into it”?

Can someone explain to me what is going on?

centos – Need to replace the HDD on a single disk system

I need to replace the HDD on a single disk system used as a pbx (CentOS-6 based FreePBX). The existing partition structure is:

ls -l /dev/sd*
brw-rw---- 1 root disk 8, 0 Apr 17  2018 /dev/sda
brw-rw---- 1 root disk 8, 1 Apr 17  2018 /dev/sda1
brw-rw---- 1 root disk 8, 2 May 25 14:12 /dev/sda2

parted /dev/sda print
Model: ATA ST3500418AS (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  525MB  524MB  primary  ext4         boot
 2      525MB   500GB  500GB  primary               lvm

parted /dev/sda1 print
Model: Unknown (unknown)
Disk /dev/sda1: 524MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number  Start  End    Size   File system  Flags
 1      0.00B  524MB  524MB  ext4

parted /dev/sda2 print
Error: /dev/sda2: unrecognised disk label 

I need to transfer the entire system to a new HDD. Ideally I would like to transfer the entire thing (boot-loader, OS, and filesystems) over the network to a larger disk temporarily installed on a separate host, that is not necessarily running CentOS, and then swap the drives. Is this possible?

I am guessing that with lvm in the mix this is a non-starter. But in case it is not then this scenario is the ideal.

Is this possible and how is it best accomplished?

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bootcamp – Boot Camp requiring disk on High Sierra

I’m running High Sierra on my late-2009 iMac.

In the past, I’ve not had trouble installing Windows 7 with Boot Camp on older versions of Mac OS

But this time, I’m getting the following error before I reach the partition page:

The installer disc could not be found.

Insert your Windows installer disc and wait a few seconds for the disc
to be recognized.

Things is, I don’t have a Windows installer disk… I downloaded an ISO for Windows 8.1 from the Microsoft website.

It might be worth also pointing out that the disk drive on my iMac no longer works, I’m not sure if this is related to me using High Sierra or whether the drive itself has just died.

Does Boot Camp require me to install Windows from a DVD? I just want to install it from the .ISO file like everyone else.

I could possibly purchase an external DVD drive and then figure out how to create a bootable Windows disk using that… but that seems like a lot of effort for something that might not even work.

windows 10 – Storage Spaces virtual disk showing as RAW instead of NTFS

I have 8 disks in a Storage Spaces pool with a single virtual disk carved out of it. I recently re-installed the OS which WAS Server 2012 R2 but am now using Windows 10 Education edition with all the latest updates installed.

After the initial OS install, Windows 10 picked up the Storage Spaces pool no problem. I was even able to pull backed up files from it to restore some applications. I enabled features such as Hyper-V and others and rebooted several times. The virtual disk (mine is assigned to “S:”) came back just fine every time.

I “upgraded pool” because it was an option and I didn’t plan on going back to an older version OS. That seemed to go OK and I could still access the VD at this time.

Then I installed all the latest updates and rebooted. This is where my issue started.

I am no longer able to access the VD (my “S:” drive) though Manage Storage Spaces reports that the VD is OK. Checking the health through PowerShell also reports that health is OK.

Disk Manager thinks that the VD is in “RAW”:


and not NTFS which is what it should say. CHKDSK knows it’s in NTFS because it reports it as such when I run it.

This is what I get when I attempt to access the VD through Windows Explorer:


I click cancel on that, fearing I may lose data (if I haven’t already) then I get this:


I have tried:

  • Running chkdsk – Fixed a ton of errors but didn’t seem to help
  • Running Connect-VirtualDisk – doesn’t seem to help

I’ve looked through the Event Viewer but don’t see anything useful there but I may not be looking in the correct place.

I’ve purchased R-STUDIO and I can see all of my files still sitting there. I’m even able to pull them back to the “C” drive. I just ordered an external drive large enough for me to extract them to that before blowing this VD away unless I can figure out how to bring it back.

Images removed because I don’t have the “points”

pc – Call of duty disk space

my friends and I have been wondering about the following thing:
Let’s say COD:MW takes 180GB of storage space, then has a 20 GB update. Afterwards, the game takes only 190GB of storage space and not 200GB.
Do you you know this happens?
I thought maybe it’s because some files are replacing older ones instead of just being “added on top”.
Thanks !

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complex analysis – Let f be a non-constant, continuous function on the closed unit disk and holomorph is its interior, such that $|f(z)|=1$ whenever $|z|=1$

Let f be a non-constant, continuous function on the closed unit disk and holomorph is
its interior, such that $|f(z)|=1$ whenever $|z|=1$ Prove that $f(D(0, 1)) = D(0, 1).$

I am trying to test this, because I need it for a test, but I have not been able to test this and I have come to think it is false

partitioning – How to recovery a USB when I can’t format it with GParted or Disk

I have made a Format using Disk in Ubuntu 20.04 LTS. I copy some files in the directory a ISO file (without making a Booteable USB), eject the USB and then I plug in again and it didn’t work … I don’t know what was the problem because I wait before every files was saved in the memory and now I can’t access or format with Disk. The command sudo fdisk -l don’t show also the USB. The only part where I can see the USB is app from Ubuntu Disk, but I can’t do anything (Attach some Screenshots).

Disk Description

Options unavailable

I have tried several solutions to fix the USB but any works. The steps here don’t work because I received the next error:

jairom:~$ sudo parted -a none /dev/sdb mkpart primary fat32 0 32768
Error: Error opening /dev/sdb: No medium found

There is any solution? I really don’t understand what was the problem, it seems my computer don’t reject well the USBs, but I have never had this situation.

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