Displaying 3 results from an estimated 3 matches for "subvolumes_and_snapshots".
2017 Mar 03
0
imaging a drive with dd
...dd if=/dev/sdb of=os.img bs=1M count=3210
That looks plausible. (I haven?t verified your count parameter exactly.)
However, I wonder why you?re trying to reinvent snapshots, a technology now built into several advanced filesystems, such as btrfs and ZFS?
https://en.wikipedia.org/wiki/Btrfs#Subvolumes_and_snapshots
btrfs is built into CentOS 7. While there have been some highly-publicized bugs in btrfs, they only affect the RAID-5/6 features. You don?t need that here, so you should be fine with btrfs.
And if you really distrust btrfs, ZFS is easy enough to integrate into CentOS on-site.
And if *that* is...
2017 Mar 03
8
imaging a drive with dd
I am building a mailserver and with all the steps, I want to image the
drive at various 'checkpoints' so I can go back and redo from a
particular point. The image is currently only 4GB on a 120GB drive.
Fdisk reports:
Disk /dev/sdb: 111.8 GiB, 120034124288 bytes, 234441649 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size
2017 Mar 03
2
imaging a drive with dd
...mg bs=1M count=3210
> That looks plausible. (I haven?t verified your count parameter exactly.)
>
> However, I wonder why you?re trying to reinvent snapshots, a technology now built into several advanced filesystems, such as btrfs and ZFS?
>
> https://en.wikipedia.org/wiki/Btrfs#Subvolumes_and_snapshots
>
> btrfs is built into CentOS 7. While there have been some highly-publicized bugs in btrfs, they only affect the RAID-5/6 features. You don?t need that here, so you should be fine with btrfs.
>
> And if you really distrust btrfs, ZFS is easy enough to integrate into CentOS on-site....