9/7/2023 0 Comments Linux testdiskinaccessible valid files, i.e., no hard links to existing inodes.invalid files, i.e., hard links to lost inodes.Since filesystems are basically a format for data, they use ordered metadata. Now that we’ve seen full device rescue, let’s continue one level below. After this, we just restore this image file to a new medium: $ ddrescue -f dump.img /dev/sda restore.logfileĪnother tool with similar functions is safecopy. Importantly, ddrescue uses special algorithms to ensure as little further wear on the medium as possible.Īgain, /dev/sda should not be mounted, and the dump.img must be on another device. However, this option might be best left for a second pass to avoid further stress a failing device. In addition, the –retry-passes ( -r) flag sets the number of retries on bad sectors. We use –idirect ( -d) to skip kernel caching. Pct rescued: 0.58%, read errors: 0, remaining time: 19mĬopying non-tried blocks. Rescued: 1597 MB, bad areas: 0, run time: 6s Non-tried: 273280 MB, bad-sector: 0 B, error rate: 0 B/s Opos: 1597 MB, non-scraped: 0 B, average rate: 228 MB/s Ipos: 1597 MB, non-trimmed: 0 B, current rate: 47972 kB/s ![]() Storage Rescueįor example, the GNU ddrescue (Disc Dump Rescue) tool can dump a raw image of the problematic medium, block by block: $ ddrescue -idirect -retry-passes=3 /dev/sda dump.img dump.logfile It might be lost (blank) or just faulty.Īfter analyzing the damage, let’s see what we can do to remedy any issues. ![]() We need to know whether the layout is still readable. I/O size (minimum/optimal): 4096 bytes / 4096 bytesĭevice Boot Start End Sectors Size Id Type Sector size (logical/physical): 512 bytes / 4096 bytes # 1 Short offline Completed without error 00% 6660 -Īfter checking the device status, we can also see the partition table via fdisk (Fixed Disk) and its –list ( -l) flag: $ fdisk -listĭisk /dev/sda: 101 GiB, 108587687936 bytes, 212085328 sectors Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error SMART Self-test log structure revision number 1 Smartctl 7.2 r5155 (local build)Ĭopyright (C) 2002-20, Bruce Allen, Christian Franke, = START OF READ SMART DATA SECTION = For example, there are the smartmontools (SMART Monitor Tools): $ smartctl -l selftest /dev/sda (Self-Monitoring, Analysis, and Reporting Technology) in modern storage devices. It’s usually best to diagnose when not booting from the target.Īlternatively, we can use S.M.A.R.T. ![]() Note how we first unmount a partition before scanning. Here, we use the -v (verbose), -s (show progress), and -n (non-destructive read-write) flags. Testing with random pattern: 1.05% done, 4:34 elapsed. Indeed, they are usually the first evidence we have of storage damage: $ umount /dev/sdaĬhecking for bad blocks in non-destructive read-write modeĬhecking for bad blocks (non-destructive read-write test) In particular, the badblocks tool is handy for finding bad blocks on a device.
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