unable to read bitmap + the image of this partition is broken

[Piotr Piotr]

Hi!

Problem concerns:
clonezilla-live-3.2.0-5-amd64
clonezilla-live-20241010-oracular-amd64

Scenario leading to problems:
I have external hard disk (classical hdd, not sdd neither nvme) with two
partitions 1) fat32 2) exfat (the size is between 12 and 13TB as it might have importance here!).

When doing backup (local image, full disk backup) I have the following
situation:
Saving backup is ok but when clonezilla is making backup verification I'm
getting the following error for the second exfat partition.

Unable to read bitmap.
The image of this partion is broken: sdc2

I tried many different options, ex. two different compression algorithms,
running as uefi and as normal usb, using usb 2.0 and 3.0 etc. Nothing helps.

Other versions:
I've checked this with my previous version of clonezilla I used:
clonezilla-live-3.1.0-22-amd64

Here it's even worse as backup of the first partition is ok, but when doing
the backup of the second exfat partition, it stops when reading bitmap. So
here it stops earlier as not during verification but during backup. And
nothing happens. There is no any progress, no any error.

Conclusion:
In my humble option verification of exfat partition image is not working
for uknown reason (either there is sth else wrong as I'm not sure what this
bitmap is).

Additional remark:
When checking
sudo fsck.exfat -n /dev/sdb2
no any errors are reported.

Expected situation:
Backup and verification of exfat files working correctly.

[Steven Shiau]

Thanks for your feedback.
It seems you are the only one reporting this issue so far.
Are you sure your hardware is flawless? Is this issue reproducible on different hardware?
BTW, it's recommended to do a memory check.

Steven

[Piotr Piotr]

I'm wondering if it might have be the result of very big partitions?

Concerning hardware, I haven't noticed any other problems (ex. under linux ubuntu, different software etc.) which would suggest that sth might be wrong with hardware. Unfortunately I don't have possibility to check this with other hardware. :(

Memory check is ok. Moreover if it was a problem with memory, other software would hang or sth....

[Steven Shiau]

Here we did a test with the following command, and it looks there is no issue for a file system > 15 TB. Maybe you test the similar command there?

root@debian:/home/user# partclone.exfat -D -s /dev/mapper/testexfat-bigexfat -O /mnt/exfat.img.domainfi
le.txt2                                                                                      
Partclone v0.3.33 http://partclone.org                                                       
Starting to map device (/dev/mapper/testexfat-bigexfat) to domain log (/mnt/exfat.img.domainfile.txt2) 
Calculating bitmap... Please wait... block 0 6873855                      
Elapsed: 00:00:01, Remaining: 00:01:39, Completed:   1.00%block 6874368 6876415 
block 6876672 6877183                                                                        
block 6877440 10020095                                                                                 
block 10020352 10024959                                                                      
block 10025216 10027263                                                                      
block 10027520 10028031                   
block 10028288 10029311                                                                                
block 10029568 10030335                                                                                
block 10030592 10030847                            
block 10031104 10031359                            
block 10031616 10032127                            
block 10032384 11298047                            
block 11298304 11303935                            
block 11304192 13161727                            
block 13161984 16969983                            
block 16970496 16972543                            
block 16972800 16973311                            
block 16973568 20116223                            
block 20116480 20121087                            
block 20121344 20123391                            
block 20123648 20124159                            
block 20124416 20125439                            
block 20125696 20126463                            
block 20126720 20126975                            
block 20127232 20127487                            
block 20127744 20128255                            
block 20128512 21394175                            
block 21394432 21400063                            
block 21400320 23258111                            
block 23258368 24508159                            
block 406179328 867552767                          
Elapsed: 00:00:05, Remaining: 00:00:00, Completed: 100.00%                                             
Total Time: 00:00:05, 100.00% completed!           
done!                    
File system:  EXFAT      
Device size:   17.6 TB = 34359721984 Blocks        
Space in use: 248.8 GB = 485873920 Blocks          
Free Space:    17.3 TB = 33873848064 Blocks        
Block size:   512 Byte   
Elapsed: 00:01:08, Remaining: 00:00:00, Completed: 100.00%, Rate: 219.50GB/min,                        
Current block: 34359721985, Total block: 34359721984, Complete: 100.00%                                
Total Time: 00:01:08, Ave. Rate: 219.50GB/min, 100.00% completed!                                      
Syncing... OK!           
Partclone successfully mapped the device (/dev/mapper/testexfat-bigexfat) to the domain log (/mnt/exfat
.img.domainfile.txt2)    
Cloned successfully.

Steven