[HN Gopher] Imaging mounted disk volumes under duress (2021)
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       Imaging mounted disk volumes under duress (2021)
        
       Author : yamrzou
       Score  : 41 points
       Date   : 2025-01-12 12:41 UTC (3 days ago)
        
 (HTM) web link (blog.benjojo.co.uk)
 (TXT) w3m dump (blog.benjojo.co.uk)
        
       | nyrikki wrote:
       | FYI, while these block level methods do have a use case, parallel
       | rsync and other file level tools are far safer and often faster
       | with less additional load on the disk.
       | 
       | Duplicating the OS/FS behavior hits the decidable problem and you
       | just hope for the best with block level, often you won't notice
       | corruption either.
        
         | groby_b wrote:
         | 1) The article's use case is _explicitly_ bootable images.
         | 
         | 2) No, most of us don't "hope for the best" with imaging, but
         | would like to actually achieve a reasonable level of
         | confidence. If your approach to data integrity is "you probably
         | won't notice corruption", you don't have an approach to data
         | integrity.
        
           | dambi0 wrote:
           | 1) The article stated that using bootable images for backup
           | was a preference. That doesn't invalidate asking whether
           | that's an ideal preference
           | 
           | 2) Arguing that it might be better to avoid such methods
           | because of possible problems with data integrity isn't a lack
           | of an approach to data integrity.
        
           | thesnide wrote:
           | I'm also doing bootable images. But the old way with a r/o
           | initrd, that does then mount the rootfs.
           | 
           | The rootfs can be mkfs and rsynced nicely.
           | 
           | That said, the article is awesome and the idea very clever.
           | 
           | But more to do streaming replication that dd catchup.
        
             | Joel_Mckay wrote:
             | initrd with native OverlayFS kernel support is very
             | versatile. ;)
             | 
             | Yet the btrfs, CephFS, or ZFS all have snapshot syncing
             | tricks that make state mirrors far more practical and safe
             | to pull off. =3
        
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       (page generated 2025-01-15 23:00 UTC)