We had an smart error message that HDD 1 & 4 had an issue and we decided to replace them.
We purchased 2 x 2TB WD Red and without reading the manual we switched off the NAS and replaced the 2 hard drives and we turned it back on we waited 2 days for rebuild but nothing happened and also when we access the website we have only a blue background.
After reading that you have to replace the hard drives from the website we switched off the NAS and placed back the old hard drives.
Now we have an error Bad Pool and we are unable to access the website and the files.
i did an md_checker and the result is
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Welcome to MD superblock checker - have a nice day~
Scanning system...
HAL firmware detected!
Scanning Enclosure 0...
RAID metadata found!
UUID: d2bce40f:7147b71b:ff356676:664b8d32
Level: raid6
Devices: 6
Name: md1
Chunk Size: 512K
md Version: 1.0
Creation Time: Apr 27 20:28:27 2016
Status: OFFLINE
===============================================================================
Disk | Device | # | Status | Last Update Time | Events | Array State
===============================================================================
1 /dev/sda3 0 Active Jun 18 10:07:41 2021 212979 AA.AAA
2 /dev/sdb3 1 Active Jun 18 10:07:41 2021 212979 AA.AAA
3 /dev/sdc3 2 Rebuild Sep 15 15:16:10 2020 44521 AAAAAA
4 /dev/sdd3 3 Active Jun 18 10:07:41 2021 212979 AA.AAA
5 /dev/sde3 4 Active Jun 18 10:07:41 2021 212979 AA.AAA
6 /dev/sdf3 5 Active Jun 18 10:07:41 2021 212979 AA.AAA
===============================================================================
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cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
md256 : active raid1 sdf2[5](S) sde2[4](S) sdd2[3](S) sdc2[2](S) sdb2[1] sda2[0]
530112 blocks super 1.0 [2/2] [UU]
bitmap: 0/1 pages [0KB], 65536KB chunk
md13 : active raid1 sdd4[3] sdc4[2] sdf4[5] sde4[4] sdb4[1]
458880 blocks super 1.0 [24/5] [UUUUU___________________]
md9 : active raid1 sdd1[3] sdc1[2] sdf1[5] sde1[4] sdb1[1]
530048 blocks super 1.0 [24/5] [UUU_UU__________________]
bitmap: 1/1 pages [4KB], 65536KB chunk
unused devices: <none>
