centos – I had some drbd (i guess block devices?) on my server, after a crash they are all gone

I am not a sys admin but inherited some servers setup with no documentation in linux. Today the server died in a way it was unresponsive and the VMs running on it down…after a good few hours the server reboot itself, so could ssh to it again but realized what used to show up in /dev as

/dev/drbd0
/dev/drbd1 etc etc

Are no longer there at all…I am guessing a drive or a series of drives went kaput. A command

cli64 vsf info

Shows that my areca disk array is checking three (volumes? block devices? thingies?) and doing it slowwwlllyyyy…

  # Name             Raid Name       Level   Capacity Ch/Id/Lun  State
===============================================================================
  1 ARC-1883-VOL#000 vm-cache        Raid3    300.0GB 00/00/00   Normal
  2 ARC-1883-VOL#001 data            Raid6   12000.0GB 00/00/01   Checking(50.4%)
  3 ARC-1883-VOL#002 apogee          Raid6   9000.0GB 00/00/02   Checking(50.6%)
  4 ARC-1883-VOL#004 database        Raid1+0 3000.0GB 00/00/03   Normal
  5 ARC-1883-VOL#005 system          Raid1+0 3000.0GB 00/00/04   Normal
  6 ARC-1883-VOL#006 archive         Raid6   6000.0GB 00/00/05   Checking(74.3%)
  7 VM-Cache Backup  VM-Cache Backup Raid1+0 2000.0GB 00/00/06   Normal
  8 VS Apogee Backup RS Apogee BackupRaid0   3000.0GB 00/00/07   Normal
  9 ARC-1883-VOL#008 TPM             Raid1+0 1500.0GB 00/01/00   Normal
 10 SDSS-BACKUP-VOLU SDSS-BACKUP-RAIDRaid0   1000.0GB 00/01/01   Normal
===============================================================================
GuiErrMsg<0x00>: Success.

It is my hope once the checks are done I will once again see the /dev/drbd folders so I can mount them and get my VM Image files off of them …. though I think that is wishful thinking. I am not sure what else to poke around to find and try to have it where drbd once again exists in my /dev directory.

Normally the command to get the VMs setup and ready to use is a :

drbdadm primary –force all

mount -o noatime /dev/drbd/by-res/vm-cache /vm-cache

then lo and behold the /vm-cache has all the .img files…..
Though with the /dev/drbd missing, this mount is of course failling.

How to log out of all devices on Google (-changing password/log out all – is not disabling gmail on android phone

I want to log out of all devices on Google. I went to a security page, changed my password, and selected log out of all devices. I pick up my phone, and I can read the e-mail that my password was changed. I can also send new emails. So I my phone was not logged out!!!!!!!!!!!!!

I think someone is logged into my gmail from another phone, and I want it logged out.

How do I do that?


The “Details” button on the bottom of the gmail page shows connections from two different phones. I have one. As opposed to the Windows sessions, there is no clickable link associated with those logins. When I click on “security checkup” on that page, it takes me to a page that only deals with the PC web sessions.

How to log out of all devices on Google (-changing password/log out all – is not disabling gmail on android phone

I want to log out of all devices on Google. I went to a security page, changed my password, and selected log out of all devices. I pick up my phone, and I can read the e-mail that my password was changed. I can also send new emails. So I my phone was not logged out!!!!!!!!!!!!!

I think someone is logged into my gmail from another phone, and I want it logged out.

How do I do that?


The “Details” button on the bottom of the gmail page shows connections from two different phones. I have one. As opposed to the Windows sessions, there is no clickable link associated with those logins. When I click on “security checkup” on that page, it takes me to a page that only deals with the PC web sessions.

directx – DirectSound only allows to capture and output from/to primary devices

I wanted to allow my users to choose the devices that they want to capture from and output to.
For this, I used DirectSound device and capture device enumeration functions, obtained GUIDs of all available devices, and arrived at the following lists (DirectSound’s grammar preserved):

Primary Sound Driver
Speakers (Realtek High Definition Audio)

Primary Sound Capture Driver
Mic in at front panel (black) (

However when I proceed to create sound capture and output devices, they only work if I supply the GUID of the primary drivers. If I supply Speakers or Mic, the result is always

No sound driver is available for use, or the given GUID is not a valid DirectSound device ID.

My thinking was that since the list of drivers is returned to me by DirectSound system, then each GUID should be valid for capture or output, respectively. What am I missing?

macos – How to remove monitors from list of sound output devices?

In my list of sound output devices I have

MacBook Pro speakers
Dell U2720Q
Dell U2720Q
My AirPods Pro

Sometimes my Mac switches output device to one of the monitors. I don’t know when but I guess that it is when I take off my airpods.

I never want to use the monitors as sound output device. Is it possible to stop this from happening?

data recovery – Can android devices be controlled/tracked (including on/off control) by IMEI?

Phone lost having sensitive data that cannot be deleted, The owner(my cousin) has gotten mentally unstable. Tried every possible solution to track it like google’s find my device. I also tried to track it by the service-provider/carrier number but couldn’t achieve any result so the SIM card has been blocked/disabled. Lastly I reported to the proper authorities to track down the device but strictly advised not to erase the data. They asked for IMEI-number of device which i provided to them on spot. No response whatsoever has been recieved that could even provide a grain of hope for recovery. My cousin is considering sucide but only me being a trustworthy person for him have been controlling him by giving him lies and false hope. The device has not been connected to the internet or even turned on since lost so that it could be tracked down (info by google’s find my phone app). The authorities told that it can only be controlled or tracked by its IMEI-number. IS IT POSSIBLE

My email-id is/was also activated on that device. Proper documents and all original accessories along with box and IMEI sticker can be shown for proving ownership of the device
Device: LG-Q60

usb – Commodity external camera devices for android?

I’m working on a prototype that involves creating an app that interfaces with external cameras (many) to take photos and the app i am designing does some processing on the captured photos.

What I’m trying to figure out is what kind of device to look for that I can buy in large quantities that are commodity (affordable and reliable). Not sure where to start.

Not sure if this question is suited for this site but it seemed to be the closest fit.

This is for a commercial product that would (ideally, eventually) be produced in quantities, hence the desire for a commodity product.

Any suggestions on what kind of device I should look for? I am using this library https://source.android.com/devices/camera/external-usb-cameras

I would prefer to stick to wired devices instead of wireless.

Turning off sensors on Android devices that doesn’t support turning off sensors from system settings

Turning off all sensors is possible on devices running Android 10 and higher from the system settings. I have a 2016 Mediatek phone running Android 5.1.1 with root privilege. I was wondering if it was possible to turn off all sensors with a one liner command or each one of them manually with seperate commands.

browser – SSL error on Firebase hosting on old Android devices

I am not being able to see my Firebase Web App on old Android Devices.

There is a question about this but the answer doesn’t say how to solve it.

Is there any solution for this?

Thanks a lot.

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calls – is there a way to force using one specific bluetooth device when connected with two devices con android?

when the phone (Android Pie) is connected with two bluetooth devices is it possible to force to use only one device during the calls ?

or is there a way to mark a specific device always active?

i have 2 device connected at same time device-A and device-B
i set device-A on phone bluetooth menu as ACTIVE.

if i do some operations from the bluetooth device-B i see on the phone bluetooth menu that the active device change from device-A to device-B and if i start a call the audio device used is device-B.
in this case i switch manually back to device-A to ear and use the mic.

is there a way to force using always device-A? always or during the calls.

do you know if there is an app to do this?

bye