2/19/2023 0 Comments Ext2 volume manager disappear![]() I'm still learning in that highly complex and convoluted field, where the information is scarce and sparse, but it would seem less stressful to read every single sector once (provided that the heads can “ go the distance”), than trying to read repeatedly the same already fragilized area from the source (containing metadata structures) in an attempt to improve time and effort efficiency. And really what's the point of imaging TB's of nothing but zeros? If we say that copying one sector one time equals one unit of drive stress then full drive imaging would earn the max stress score of 100% while the stress score for partial imaging can be considerably less. In today's world of multi TB drives, performing full drive imaging can be very inefficient and places unneeded stress on the source drive. In my remote data recovery practice I use a technique I call drive hybridization which takes a partial image and joins it to the unimaged remainder of the source drive to create a hybrid drive that is both part image and part hard drive which can then be used for data recovery operations. In which case the original directory structure and the original file names will be lost, and fragmented files won't be recovered correctly. And even if I finish the cloning process, with one defective head there are almost certainly going to be missing “INodes” or whatnot. So where are the remaining 115GB ? Could it be because of “sparse” writing enabled globally ? (See previous post.) Or could there be a large chunk beyond 1.7TB, with that much totally empty space before ?Īnd the issue with extracting data from those 438GB is that key metadata components are currently missing, because they are located beyond what is recovered. Normally Windows shouldn't alter Linux partitions, but I have a driver installed called “Ext2 Volume Manager”, and I got a BSOD when I accidentally double-clicked on the letter of the main partition – if I remember correctly, I may have BSODed myself.)Īs I explained, I observed that starting from about 12% only 00s were copied, and when I examined the recovery drive after stopping the cloning at 47% / 1.7TB, it was empty beyond 438GB (I didn't examine it thoroughly, there might be some small islands of data in that sea of emptiness, but nothing significant enough in size to be visible when scrolling up and down in WinHex). I'm wondering if those differences are due to skipped sectors, or if something was altered when I plugged the recovery drive on Windows. Is there any way I could determine what exactly is damaged in the filesystem and try to repair it somehow ? (As I already wrote, I first made a partial image with ddrescue, which I saved, and when I compared that image with the clone I noticed many differences I haven't yet tried to merge them, it may or may not fix something. The following example uses one volume, /dev/xvdf, to create the physical volume.How can the free space be correctly calculated if there are missing “$BlockBitmap” files ? Use the pvcreate command to create a physical volume. Create your EBS volume and then attach the volume to your instance.ģ. Open the Amazon Elastic Compute Cloud (Amazon EC2) console.Ģ. For more information on device naming, see Device names on Linux instances.ġ. If you're using a Nitro-based instance, then replace the device names in the following steps with the appropriate device name. The block device names follow the pattern /dev/nvme1n1, /dev/nvme2n1, /dev/nvme3n1, and so on. ![]() ![]() Note: Nitro-based instances expose volumes as NVMe devices. You can create a PV on a single EBS volume or multiple EBS volumes. The underlying physical storage unit of an LVM logical volume is a block device such as a partition of an EBS volume or an entire EBS volume. Note: If you already created LVM on your volume and mounted it for use, then follow the instructions beginning at Extend the logical volume.Ĭreate physical volumes from your EBS volumes
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