Have raw pbundle data on drive, need it to be recognize as time machine

So I made a home-brewed linux / raspberry pi time machine more or less like this. I ended up with time machine data stored on an ext4 partition shared via samba that was successfully recognized and used as a time machine backup destination my my mac. The drive holds 3TB of information, so it’s full of something.

But when I tried to use that drive as a source from Migration Assistant after my mac was wiped by apple repair, it won’t recognize the network drive.

So I bought another 6TB drive, formatted it as HFS, and copied the .pbundle / sparsebundle file onto it. I thought of this as a “nuclear” option sure to work.

But now, the mac still doesn’t see this new drive as a time machine source.

What should I do? How should I recover my data?

mac os x – MySQL with symlinked databases on an external drive on MacOS cannot read idb files

I have had this setup working for years, but all of the sudden today, MySQL crashed, and now I’m having trouble with every database on my external drive on my Mac.

It is currently running MySQL 8.0.21, and that update was done 3 months ago. Prior to that is when I say “working for years” since verstion 5.6/5.7. I haven’t updated the OS recently either — it has been running Catalina for a while.

Initially after the crash, the databases could not be recovered automatically by InnoDB. When it started up, it had lines for all of the tables in every one of those DBs that mentioned they could not be recovered because they were “in an unprotected location.”

Eventually, I figured out how to change the permissions for the users on the external drive to match those expected by mysql, and put this extra location in innodb_directories config setting, and it starts up OK.

However, now, when trying to select data, it tells me Tablespace is missing for table ... and there is a new error in the error log:

Operating system error number 1 in a file operation.
Error number 1 means 'Operation not permitted'
Cannot open datafile for read-only: ... OS error: 101

Not sure why it’s giving me both error 1 and 101, but according to perror, 1 is indeed operation not permitted, and 101 is STREAM ioctl timeout.

As for “not permitted” — the permissions were actually more lenient on these folders. drwxr-xr-x vs. drwxr-x--- (so, world readable and executable) and the ibd files within them are similarly more lenient: -rw-r--r-- vs -rw-r-----.

I don’t even know where to start with error 101, except to try to clear error 1 first, and see if it goes away. The drive is absolutely accessible, even by mysql, which could read it to start up, as best I can tell (since the errors regarding them being unprotected went away).

I decided to chmod o-r and chmod o-x to make those folders and tables match exactly the permissions on the ones that worked. I restarted mysql to see if that made a difference in its ability to read those tables in the databases on the external drive, but it gives the same errors.

I moved a database folder that was working from the main drive to the external drive. It continued to work, until I restarted MySQL. Then it started up as normal, but when selecting data again it gave the same error as before. I moved a database from where it didn’t work on the external drive, to the main MySQL folder, and restarted MySQL, and it works fine. Move it back, and we get the same errors.

MySQL runs under the same user account that I am logged in as, so I don’t see why it would have an issue with any kind of permissions related to the user account.

Finally, I tried adding mysqld and mysqld_safe to Full Disk Access in MacOS and restarting MySQL, in case MacOS was blocking it at the program level, again with no luck.

I am out of ideas. Anyone have anything else I can try?

hard drive – Reinstall MacOS or/vs Reformat?

My current install of Catalina has gone a bit wonky. Every other time I start it up it displays the circle with a line through it, so I do a hard restart and it will then boot into Catalina.

I’m trying to move to Big Sur and wondering if I should do a fresh install/reformat, or if i should do a Reinstall MacOS from the recovery screen.

From what I understand Reinstall MacOS just rewrites the OS files, but keeps everything else intact like document, downloads, apps, etc…?

Should I upgrade to Big Sur first? Or Reinstall Catalina, and then upgrade to Big Sur? Or just a fresh install? (Running an iMac Pro)

Restore android google drive backup after factory reset

I have google drive backup. I am using android 10 on nokia mobile. I did factory reset / erase all data. during set up I skip restore backup.

I check on google drive. I have backup on 23 February. But How do I restore that backup.
I do not find restore backup option on device. I check in setting.

Does remotely wiping my drive remotely also erase data on a Windows partition?

I am running Mac (big sur) with Windows installed via bootcamp on another partition. If my device is stolen I will need to ensure all the data in my windows partition also gets wiped along with the data on mac os (Even if the thief opens the windows partition first). I was wondering whether ‘Find my device’ will do this or whether I need to install some software on Windows to enable me to wipe it remotely such as Microsoft InTune or similar.

My concern is the code that listens for wipe notifications from the find my device service only runs on mac os and so won’t run if booted into windows. I am also assuming since there is no internet connection before an os is booted it won’t be able to receive that notification. Perhaps the bootcamp assistant program installed on Windows does this for me?

hard drive – Mac Mini won’t restart after erased with Find My app

I recently had to erase my Mac Mini (bought in 2019) using the Find My app on my iPhone.

After I did, I switched the Mac Mini on and tried to install the OS on it. However, when prompted to choose a start-up disk, I had no disk available. There seemed to be no way out of it, so I turned the Mac off and back on and since then it displays nothing on the screen: no flashing folder with a question mark, no startup menu, nothing.

I have tried the following (from here) (with an Apple keyboard plugged in):

  • Leaving the Mac unplugged for 24h hours and trying again
  • Booting with Cmd R
  • Booting with Option
  • Booting with Option Cmd P R
  • Booting with Shift
  • Booting with D
  • Booting with Option D (Ethernet cable connected)

None of this showed anything in the monitor (it just goes to sleep mode after a while) except for Option-Cmd-P-R (resetting the NVRAM) which showed the Apple logo and then the flashing folder with the question mark.

This is driving me crazy since I just erased the Mac using Apple’s app and now Apple wants to charge me for a repair.

Can anyone suggest anything else I can try before sending it for repair?

Thank you

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windows – Sometimes drive mappings don’t connect at logon

I have this strange problem at all our clients. Sometimes, when u user logs on, a drive-mapping is missing. So for example, the user needs 2 drive-mappings, but gets only one.

We are deploying drive-mappings through GPO. I am aware of these issues:

  1. Set Group Policy to always run synchronously (explained here: https://social.technet.microsoft.com/wiki/contents/articles/12221.group-policy-troubleshooting-drive-maps-preference-extension-replace-mode-only-maps-the-drive-every-other-logon.aspx?wa=wsignin1.0)
  2. Set policy to Update, not Create or Replace. I’m aware that Replace will disconnect and reconnect a drive-mapping in the middle of the day when group-policies are updated.

This problem doesn’t happen often. It’s only once in months. Sometimes rebooting or logoff/logon might solve the issue, sometimes not. There are no errors or helpful events in EventLog. Sometimes running gpupdate causes the drive to connect, sometimes not. All clients are Windows 10, all on local LAN’s. In all cases I could just connect the missing drive letter manual with a NET USE command.

I did not enable reconnect at the drive-mapping policy, but I’m trying that now, however that shouldn’t be necessary.
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Thanks for any help.

Upload Excel File from Local PC to Network Drive via PowerApps/Flow

I want to upload excel files to Network Drive from Local PC by using PowerApps ( Attachment Control ).

is there any particular way to do this? 

I am actually stuck on this requirement by the client as they want to upload there excel files in different folders of network drives.


physical – What is the benefit of 2 drive thru lanes at a fast food restaurant?

the payment and receipt of food is still done serially, which would seem to negate any benefit from orders being placed in parallel.

There is no reason to assume this is true.

The answer, from a UX perspective has to be:

The benefit for the user is getting their food faster because the restaurant can process more meals per hour, leading to shorter queues.

There are two things to consider here to understand why the basic premise of this question is probably wrong.

Simply moving from a concurrent step to a serial step does NOT negate the benefits of the earlier paralellism.

Let’s look at an analogous example from web development. We want to fetch data from two different servers (parallel processes) and then use that data to render text into a web page from top to bottom (serial process).

If it takes 3 seconds to hit each server and 1ms to render the response from a server we can obviously either take 6 seconds or 3 seconds to finish the task depending on our choice of parallel or serial for the first step ONLY.

The second step’s parallelism changes the overall situation by 1ms, making it completely irrelevant.

You see the same situation at the fast food restaurant.

Time to take an order, create and package the food ~= 5 minutes.
Time to take money and hand food through a window ~= 30 seconds.

Provided that the internal team has the facilities to prepare at least 2 orders at once, the result is:

Step 1 in parallel = 5.5 minutes total
Step 1 in serial = 10.5 minutes in total

The parallelism of step 2 doesn’t negate anything here.

A system with a series of sequential steps is constrained ONLY by the slowest step.

This is called theory of constraints. It has a wikipedia article too.

The summary is that in a system with a chain (or even multiple converging or diverging chains) of processes that need to be completed, the system moves only as quickly as the slowest step.

Attempts to optimise any step other than the slowest step have no positive impact and can even have a negative impact on overall productivity.

Imagine a traffic jam at peak hour where many lanes (A) converge into fewer lanes (B) and then diverge back to many (C). Something like this:

traffic jam - theory of constraints

It should be clear that adding additional lanes at:

A – will make traffic worse by increasing congestion ahead of the bottleneck (incidentally, this is why we use words like “bottleneck” to talk about a limiting factor in a process)
B – will increase throughput of the system
C – will have no positive or negative impact on the traffic

Your example of a fast food restaurant (or literally any other system in the world) has just one severely limiting factor at any point in time. Nothing else is worth optimising.

Think of the following stages of throughput in real space/time terms of burgers per minute per square meter, after all, this is how they pay rent (I’m just guessing rough numbers):

  • Collecting orders (~ 2 mins) from a drive thru lane (~20 m2) = 0.025 b/min/m2
  • Preparing orders (~ 3 mins) from a burger grill (~1 m2) = 0.3 b/min/m2
  • Delivering orders (~ 0.5 min) from a kiosk (~2 m2) = 1 b/min/m2

Now also consider that the nothing can be done before you place the order yet preparing and delivering orders can be done in parallel with taking new orders.

It should be clear why:

  • A very large amount of physical space shown in the OPs aerial photo is dedicated to taking orders, relative to other tasks
  • Taking orders is handled in parallel (it is the step that needs to be optimised)
  • Every other step (before and after) can be safely handled in serial (trading throughput/latency for less physical space requirements) as their throughput does not effect the throughput of the system overall

It also hints as to why perhaps having 2 lanes for orders makes sense but not 3, or 10 or 50 – this would be out of proportion for the size of the kitchen and other available facilities required to process burgers.

One potential avenue for followup, would be whether this restaurant is really optimised for consistent user experience (latency) or just total revenue per square meter (throughput). As far as sending items concurrently through parallel/sequential processes goes, they are not necessarily the same thing. It’s quite possible to optimise overall throughput in such a way that individual items may suffer additional latency (like when the OPs order is forgotten at the kiosk).