disk utility – How to use internal HDD as a file sharing drive if I boot from external SSD on mac mini?

I’m running Mojave 10.14.6 on mac mini late 2014.

It has internal hdd drive. I bought an external ssd to speed things up and run everything from it, and use internal hdd as a data storagetime machine

I installed OS on ssd and am running the mac from it, but I can’t seem to erase the internal hdd drive. When trying to partition it in Disk utility I’m getting an error

The volume “osx” on disk1s1 couldn’t be unmounted because it is in use by process 82 (securityd)

After this error happened, disk utility shows that hdd has two partitions, 500gb each (that’s how I set it up on ‘partitioning’ step), but I can see only the partition that was there before, no new partition that I added. Might sound confusing – please see the screenshots here.

Now, I’m very sure that I run OS from external SSD, so I don’t understand why any process would use internal hdd and what should I do from now on.

So the question is, how do I use internal hdd as a data storage drive, and erase the OS from it?

disk encryption – Security against local attack for remote FDE decryption?

Is there any remote FDE decryption that is resistant to an attacker that has local physical access?

Tools like dracut-sshd need to store the private key used for the sshd server on the unencrypted boot partition, so a local attacker has the ability to become a MITM and sniff the decryption password.

Can using a TPM to protect the sshd key foil this attack?

Does clevis-tang have essentially the same problem? At the bottom of the tang README.md is this list of security considerations:

  1. Man-in-the-Middle
  2. Compromise the client to gain access to cJWK
  3. Compromise the server to gain access to sJWK's private key

Problem (1) is not a concern according to this document. I assume you avoid problem (3) by running the tang server on a FDE itself or storing the key on a HSM. Problem (2) sounds impossible to protect against if the attacker is local – is that correct?

The tang documentation stresses that the…

client protect cJWK from prying eyes. This may include device
permissions, filesystem permissions, security frameworks (such as
SELinux) or even the use of hardware encryption such as a TPM

Is the TPM option the only way to foil an attacker with physical access to the unencrypted boot partition?

Is there any work-around that allows remote unattended FDE decryption that a local attacker cannot compromise?

sql server – TempDB started constant disk IO

At around 10am yesterday I started seeing constant read/write activity to the TempDB database via our RedGate SQL monitor.

This is unusual because usually our disk operations are <100kb/s however as you can see from the graph it has started around 10am and continued even after a restart of the host OS.

Does anyone have any pointers for where I can look to identify what queries or transactions etc might be causing this anomolous disk IO?

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partitioning – Removing the Zorin-vg mount point to erase disk and install another OS?

I’m very new to linux and have installed Zorin OS, which I think is based on Ubuntu, as the only OS on my machine and I want to remove it but can’t get past the partition stage. It appears that the disk is now called /dev/zorin-vg.

I read that sudo swapoff -a might help but it has not.

Is there something that must be done in Ubuntu-based linux distributions to “free-up” the disk to be erased?

I’m trying to use Calamare to partition automatically at install of new OS but it shows only the option to manually set a partition. It also listw two disks in the drop-down. One is the system name that one would expect to find there and the other is zorin-vg.

If choose the first, the only option is to manually partition. If choose zorin-vg, then all the options appear but the install fails in about five seconds at the mount stage.

How can I get it such that a new OS can be installed replacing Zorin?

Thank you.

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partitioning – Ubuntu 20.04 headless disk allocation, only 10GB for /home/user

I’m using a pre installed and configured Ubuntu 20.04 image from my provider. The server is preconfigured with 2x1TB Raid1. I noticed once I set up a new User the allocated space was only 10GB. It seems like the RAID space is not allocated, how can I allocate the 1TB space and make it the default space for new users? Also do I need to delete and recreate the already created user so the new free space will be properly provided to it?
Thank you!

Model: ATA HGST HUS722T1TAL (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name     Flags
 1      1049kB  3146kB  2097kB                  primary  bios_grub
 2      3146kB  30.0GB  30.0GB  ext3            primary  raid
 3      30.0GB  40.0GB  10.0GB  linux-swap(v1)  primary  swap
 4      40.0GB  1000GB  960GB                   primary  raid


Model: ATA HGST HUS722T1TAL (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system     Name     Flags
 1      1049kB  3146kB  2097kB                  primary  bios_grub
 2      3146kB  30.0GB  30.0GB  ext3            primary  raid
 3      30.0GB  40.0GB  10.0GB  linux-swap(v1)  primary  swap
 4      40.0GB  1000GB  960GB                   primary  raid


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/vg00-var: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system  Flags
 1      0.00B  10.7GB  10.7GB  ext4


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/vg00-usr: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system  Flags
 1      0.00B  10.7GB  10.7GB  ext4


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/vg00-home: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system  Flags
 1      0.00B  10.7GB  10.7GB  ext4


Error: /dev/md4: unrecognised disk label
Model: Linux Software RAID Array (md)
Disk /dev/md4: 960GB
Sector size (logical/physical): 512B/512B
Partition Table: unknown
Disk Flags:

Model: Linux Software RAID Array (md)
Disk /dev/md2: 30.0GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system  Flags
 1      0.00B  30.0GB  30.0GB  ext3

NAME            MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
loop0             7:0    0  99.2M  1 loop  /snap/core/10958
loop1             7:1    0  68.7M  1 loop  /snap/lxd/19823
loop2             7:2    0  55.5M  1 loop  /snap/core18/1997
loop3             7:3    0  89.1M  1 loop  /snap/core/8268
loop4             7:4    0  54.9M  1 loop  /snap/lxd/12631
sda               8:0    0 931.5G  0 disk
├─sda1            8:1    0     2M  0 part
├─sda2            8:2    0    28G  0 part
│ └─md2           9:2    0    28G  0 raid1 /
├─sda3            8:3    0   9.3G  0 part  (SWAP)
└─sda4            8:4    0 894.3G  0 part
  └─md4           9:4    0 894.3G  0 raid1
    ├─vg00-usr  253:0    0    10G  0 lvm   /usr
    ├─vg00-var  253:1    0    10G  0 lvm   /var
    └─vg00-home 253:2    0    10G  0 lvm   /home
sdb               8:16   0 931.5G  0 disk
├─sdb1            8:17   0     2M  0 part
├─sdb2            8:18   0    28G  0 part
│ └─md2           9:2    0    28G  0 raid1 /
├─sdb3            8:19   0   9.3G  0 part  (SWAP)
└─sdb4            8:20   0 894.3G  0 part
  └─md4           9:4    0 894.3G  0 raid1
    ├─vg00-usr  253:0    0    10G  0 lvm   /usr
    ├─vg00-var  253:1    0    10G  0 lvm   /var
    └─vg00-home 253:2    0    10G  0 lvm   /home

hard drive – how to generate a report or log from nmon which is specific to disk i/o?

Per the man page for nmon I ran:

nmon -f -d sda5 -t -r /home/thufir/performance/disk.log

which generated quite a large file, as dur_210411_2146.nmon so, rather minor question is how to specify the file name when running the above command. More importantly, how can I get a summary of disk io? I see spikes hard drive so want to see when those are occurring and why. (Presumably it’s swap, but seems excessive.)

virtualbox – Hyper-V VM extremely slow – 100% disk usage always

Windows 10 Pro host

Windows 10 Developer VM

Operations related to installing/removing applications are extremely slow on my VM and task manager shows disk usage always at 100%, average response time is between 80 – 250ms. CPU usage never gets above 2 – 5% and memory normally stays below 80%. I’ve tried messing around with RAM starting off with 2gb allocated and eventually trying 8gb allocation with no effect. My host has 32gb RAM.

So given this I can only assume that my RAM/CPU configurations aren’t issue and there’s something else wrong. I’ve read many posts online and tried suggested solutions but nothing I find has made any difference. I’ve been using VirtualBox up until now and the performance of those VMs have been infinitely better, I’ve read that Hyper-V is generally meant to be faster so I guess this further suggests there might be a misconfiguration somewhere.

How can I improve/troubleshoot my VMs performance?