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  1. Hello! This is a short guide about how to downgrade from DSM 6.2 to DSM 6.1 after a failed upgrade. I made this mistake myself, so i'm sharing how to fix it! Your going to need a spare HDD or SSD. Make sure there is nothing on it. You've installed DSM before, so you should have your synoboot.img from JunsLoader. Your current bootloader on your USB in now NONFUNCTIONING, you will need to reflash your USB with JunsLoader. Once you have your new, reflashed USB stick, unplug ALL drives from the motherboard. Make sure there are NO SATA interfaces connected. Plug in your new, empty drive to the motherboard and boot from the USB stick. (You will need a keyboard for this step) The first option in the GRUB interface is what you are looking for. Use http://find.synology.com or Synology Web Assistant to find your DSM. Follow the steps and install DSM 6.1 from a PAT file. DO NOT INSTALL 6.2 IF YOU LEFT A DRIVE IN IT WILL SAY RECOVER. GOTO 2. Let Synology do its thing and eventually you will have a working 6.1. While the PC is ON, connect the drives to the motherboard (with you data on it). Under Storage Manager they will pop up and say Unused. You might need to reboot, at this option. It took me some fiddling around, but eventually Synology will prompt you with a Recover Crashed Partition prompt. Click Yes. All of your data will appear, and Synology will automatically perform RAID scrubbing.
  2. Hello. Broken write and read cache in the storage. There are disks but writes that there is no cache and the disk is not available. Tried it in ubuntu: root@ubuntu:/home/root# mdadm -D /dev/md2 /dev/md2: Version : 1.2 Creation Time : Tue Dec 8 23:15:41 2020 Raid Level : raid5 Array Size : 7794770176 (7433.67 GiB 7981.84 GB) Used Dev Size : 1948692544 (1858.42 GiB 1995.46 GB) Raid Devices : 5 Total Devices : 5 Persistence : Superblock is persistent Update Time : Tue Jun 22 22:16:38 2021 State : clean Active Devices : 5 Working Devices : 5 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 64K Consistency Policy : resync Name : memedia:2 UUID : ae85cc53:ecc1226b:0b6f21b5:b81b58c5 Events : 34754 root@ubuntu:/home/root# btrfs-find-root /dev/vg1/volume_1 parent transid verify failed on 20971520 wanted 48188 found 201397 parent transid verify failed on 20971520 wanted 48188 found 201397 parent transid verify failed on 20971520 wanted 48188 found 201397 parent transid verify failed on 20971520 wanted 48188 found 201397 Ignoring transid failure parent transid verify failed on 2230861594624 wanted 54011 found 196832 parent transid verify failed on 2230861594624 wanted 54011 found 196832 parent transid verify failed on 2230861594624 wanted 54011 found 196832 parent transid verify failed on 2230861594624 wanted 54011 found 196832 Ignoring transid failure Couldn't setup extent tree Couldn't setup device tree Superblock thinks the generation is 54011 Superblock thinks the level is 1 Well block 2095916859392(gen: 218669 level: 1) seems good, but generation/level doesn't match, want gen: 54011 level: 1 Well block 2095916580864(gen: 218668 level: 1) seems good, but generation/level doesn't match, want gen: 54011 level: 1 Well block 2095916056576(gen: 218667 level: 1) seems good, but generation/level doesn't match, want gen: 54011 level: 1 Well block 2095915335680(gen: 218666 level: 1) seems good, but generation/level doesn't match, want gen: 54011 level: 1 root@ubuntu:/home/root# btrfs check --repair -r 2095916859392 -s 1 /dev/vg1/volume_1 enabling repair mode using SB copy 1, bytenr 67108864 couldn't open RDWR because of unsupported option features (3). ERROR: cannot open file system root@ubuntu:/home/root# btrfs check --clear-space-cache v1 /dev/mapper/vg1-volume_1 couldn't open RDWR because of unsupported option features (3). ERROR: cannot open file system root@ubuntu:/home/root# btrfs check --clear-space-cache v2 /dev/mapper/vg1-volume_1 couldn't open RDWR because of unsupported option features (3). ERROR: cannot open file system root@ubuntu:/home/root# mount -o recovery /dev/vg1/volume_1 /mnt/volume1/ mount: /mnt/volume1: wrong fs type, bad option, bad superblock on /dev/mapper/vg1-volume_1, missing codepage or helper program, or other error. All possible commands are answered: couldn't open RDWR because of unsupported option features (3). Tell me - something can be recovered from such an array? Thank you very much in advance!
  3. Hi I've been running DSM 5.2 happily on my HP Gen8 for a few years It contains 2 WD Red drives as JBOB (no raid) Well yesterday Volume 1 crashed - I've managed to recover my data (pix etc) So that disc needs to come out but I'm wondering if I swap out the other one (3tb) and replace with 2 x 4tb ones running as RAID 1 for integrity I figured it would be a excuse to finally upgrade to dsm6.2 while I'm at it (pretty much start again as a new install) BUT here is my main stress - all the multimedia apps that are installed are installed on the crashed volume and don't run so I can't get their settings (its been a REALLY long time since I did this and setting all those again will make me cry even more than I am already 😢) Is there any way to get a backup of these settings and configuration? What settings are found in the backup section of control panel anyway? Thanks
  4. Hi, My DS1515+ is dead (intel C2538 bug) since one month, i'm waiting the RMA from my reseller's since Synology doesn't take rma directly... My 5 disks (shr1) are OK and i'm wondering if i can recover my data using xpenology rather than ubuntu's method. I can't remember wich dsm version was installed on the DS1515+ (probably 6.x). Thanks.
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