Unlike these other disk images, a zvol is NOT a file, but is a reference to a block device. These are similar to other virtual disks, like vmWare's VMDK or Hyper-V's VHD. A dataset is essentially its own independent ZFS filesystem. This is also the smallest structure for setting ZFS flags. A dataset is a self-contained ZFS container for data, and is the smallest unit of control for ZFS policies like compression, deduplication, and quotas.STOP! You'll need to think at this point about how to structure your data.ġ) Understand the difference between a dataset and a zvol. Now you have an empty pool and a pile of bits to throw in. Assuming you've read The path to success for block storage sticky, you've decided on the composition of your pool (RAIDZx vs mirrors), and built your pool accordingly. So you've got a shiny new FreeNAS server, just begging to have you create a pool and start loading it up. Rather then using dd, might I suggest using ddrescue - this is designed to handle data recovery, gives you a progress indication and progress log it can use to allow you to stop and restart the process.Path to Success for Structuring Datasets in Your Pool While 500 gig is not tiny, it is not massive, and your best bet might be to clone the whole disk, then delete /home on the target. ![]() That said, trying to data recovery this way would seem to me like a recipe for disaster. You may be able to get some useful data about the "physical extents" - ie the underlying blocks by using vgdisplay to see the block side, and then "lvdisplay -m" to see the extents are not in use. Because LVM abstracts the disk from the partition, your LVM could be in multiple parts. You ask "how can I find the exact number to count before the data in /home begin" - You may not be able to do this. I think the issue lies with the fact that you are using LVM, which makes it very difficult to do what you are attempting. Now I make the system again with the same options and I wanna copy everything from 0 till first block with user data in '/home' to keep the data from /home intact. Then I tried in many ways to recover some data but without success. I tried to boot CentOs > Troubleshooting but I got the "ou don't have any linux partitionsY". The problem is that I tried to live migrate a vm from a node to another, the migration fail and the main hdd fail. ![]() I/O size (minimum/optimal): 512 bytes / 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes ![]() ![]() Both hdd have ( the damaged hdd had* ) the same partition schema and the os was installed with the same options, the hdd space is the same ~]# fdisk -lĭisk /dev/sda: 549.8 GB, 549755813888 bytes, 1073741824 sectors The target HDD is broken and I wanna copy everything except the /home content ( including partition schema or whatever metadata /home have ) just to leave the /home content intact on the old hdd. I wanna clone a hdd but without loosing data from /home
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