Hello, I am using TrueNAS Core as my storage server. I have 6 HDDs, and they are not on RAID. 1 of the HDDs failed, and the server won’t boot until I take it out; it boots normally. The Zpool import shows the pool as unvail.
How can I restore the pool with the data on the other 5 remaining HDDs?
Thank you
If you had a stripe of six drives 
(zpool status would confirm), you cannot recover the pool without bringing back the failed drive. Full stop. No redundancy, no mercy.
To possibly recover some data without a drive, look into Klennet ZFS Recovery. Don’t put your hopes too high…
Whaat? 
Can you explain how to use the recovery toop,please?
If you put 6 drives in a striped pool, ZFS does not put some files on this drive and some other files on that one. Every single file is spread out across all your drives at the block level. So first block of file on drive 1, second on drive 2, …
One drive breaks → all your files are missing 1/6 of their data.
That’s why ZFS provides various mechanisms for redundancy. But you have to use them. Before a drive fails.
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Is there no way I can save at least 1/2 of the data?
Something, please. Or can the HDD even be fixed?
just a positive solution
Klennet, but its 400 USD for recovery, free to scan.
hopefully you have backup somewhere.
Wow, be-careful with stripes. Truenas warns you when you set the pool up and then add Stripes in a new vdev that there is no redundancy. I use stripe in a backup machine, don’t care if a drive fails or not, I still have original data.
We can’t know…
Does is spin? Does it makes strange noises? It is seen as a device in BIOS? Or is it a plain dead paperweight?
Get more drive(s), enough to hold the entire content of the pool you want to recover.
If the failed drive is still somehow responsive, try to get something out of it. One possible trick is to plug it on a long cable—USB adapter if it has to—, put it in a dry bag and run it from inside the fridge, or from outside the windowsill, hoping that the cold will help. If the drive does comes up, act quicky to copy your data out, or clone the bad drive!
If the drive is done and dead, you can only hope to recover those (small) files which had no data chunk on it. Plug the remaining drives to a Windows machine, along with spare drives for recovery and run Klennet ZFS Recovery to scan: It will tell you what it can recover… if you pay the license.
Or you bring all six drives, and a heafty sum of money, to a professional recovery service which can open the dead drive in a clean room and read its platters to reconstruct the pool.
As you and thousands of LA residents have found out the hard way, insurance only looks expensive before disaster strucks…