March 20, 201610 yr Had an old 128GB SSD laying around. Thought to try using is a cache drive. Slipped it into slot #20 AND ASSIGNED IT TO THAT DISC NUMBER (bad, I know). I formatted it. I then assigned it my cache drive. Couldn't seem to assign it as my cache drive. Decided to give up, for now Remove the drive and now have the red x saying drive missing. *** I would like to figure out how to put the cache drive in that slot or I will put a 3TB drive in that slot to use in the array when my current drive fills (which is soon). *** What is the best / easiest way to get rid of my red x - drive is missing. I did notice the big thread of having to reset all drives (paraphrase) and that seems like overkill / way to hard for me to do. Hellllllp.
March 20, 201610 yr Community Expert Restore the backup of your Flash Drive that you make before you installed the SSD. (You did make a backup, didn't you? ) In any case, you will have to rebuilt parity as the formatting of the 'cache' drive will have changed the info on the parity drive which if you just remove the SSD will now cause the parity to be invalid!!!
March 20, 201610 yr Are you really running version 5 of unRAID, as your sig suggests, Rick? I have little experience of version 5 and this section of the site is for support with version 6. You might want to read this: http://lime-technology.com/wiki/index.php/FAQ_remove_drive
March 20, 201610 yr Lots of info around here about how to shrink your array (which is basically what the OP wants), but what I would do rather than muck about with everything is just do a new config and rebuild parity. (take a screenshot of your drive assignments before you do this so you can reassign them correctly) You say that you can pop a 3tb in when you're ready (soon). Trouble is that (assuming you're pre 6.2) is that your array is effectively unprotected until that happens because you're already down a drive.
March 20, 201610 yr Author I'm on 6.1.4 (I changed my sig) No, didn't think to do a backup. I probably have an old one around but wouldn't want to use it. I'll do the rebuild. Damn! Stupid, stupid mistake. I'll put the SSD drive back into the array until I work out the steps involved. Stupid, stupid.
March 20, 201610 yr A backup wouldn't help you all that much - you still have to rebuild parity. Just make certain you reassign the correct drive as the parity drive. The rest can be in any order you like.
March 21, 201610 yr Author Can't I just put the SSD back and mount it - thus having a protected array. Then, on Tuesday, when the new drive arrives put it in it's place and rebuild THAT drive from 128GB to 3TB and be done with it (like I would be upgrading the capacity of that particular slot / drive)?
March 21, 201610 yr Community Expert Did you start the array with the drive missing? If so then rebuilding parity (or rebuilding the missing drive) are the only choices.
March 21, 201610 yr Community Expert If you started the array with it missing it won't let you put it back, but you can rebuild to the same disk, if it's a small SSD it will rebuild fast and you'll stay protected until the 3TB disk upgrade.
March 21, 201610 yr Author to rebuild only one drive do I use the check box at the bottom of the main page to reformat (or something like that). Will do tonight.
March 21, 201610 yr Community Expert to rebuild only one drive do I use the check box at the bottom of the main page to reformat (or something like that). Will do tonight. Whatever you do, do not select an option to format the disk. That will write a new empty file system to the disk effectively wiping all the existing data from it (unless that is what you WANT to do).
March 21, 201610 yr Community Expert to rebuild only one drive do I use the check box at the bottom of the main page to reformat (or something like that). Will do tonight. Formatting is NEVER part of the rebuild process. What format actually means is, write an empty filesystem to this disk. That is what it has always meant in every OS you have ever used. When you format a disk in unRAID, it treats the write that creates the empty filesystem just like it treats any other write, by updating parity. Then when you rebuild, you will rebuild an empty filesystem. Probably not what you wanted.
March 21, 201610 yr Author There is nothing on the small SSD that was meant to be the cache drive. I was simply thinking formating my 'straighten out' my lack of valid parity quicker. I think I understand, though, now. I have added a few files to the array since all this happened and parity was not written to (hence the faster speed it wrote to the box). I will run a parity check and enable 'write / correct any problems' (can't remember what the check box actually says off-hand). Then upgrade the SSD to a large capacity drive, then add a cache drive without mounting it through the array. If this looks good I will mark solved. WAIT - I saw this in another thread. Why can't I just do the same - plop the new 3TB drive in and hit rebuild??? I just recently did this to replace a 3TB with a 6TB drive. You don't need to clear off the contents. Just stop the array, remove the 2TB from the array list, and start the array again. It will show the drive as missing. Stop the array, then put the 4TB drive into the missing slot and let UnRAID rebuild the drive with all of it's contents. This also gives you a backup of your data as it's still sitting on the 2TB drive you removed in the event of an issue. Confused as hell. Yikes.
March 21, 201610 yr Community Expert ...Why can't I just do the same - plop the new 3TB drive in and hit rebuild??? You can.
March 21, 201610 yr Community Expert ...Why can't I just do the same - plop the new 3TB drive in and hit rebuild??? You can. You don't really even need to do all that stopping and starting. Just shutdown, replace the drive, boot up, assign the new drive to the slot the old drive was in, and start will begin rebuild.
March 22, 201610 yr Author So, in order to mark this as solved: Put in new 3TB drive in SSD missing slot. Format new drive (or can preclear) and mount. Run parity check and allow to correct errors (since I wrote a few files to another disc while unprotected). This should get me back up and running and with a new fresh drive waiting in the wings.
March 22, 201610 yr Community Expert So, in order to mark this as solved: Put in new 3TB drive in SSD missing slot. Format new drive (or can preclear) and mount. Run parity check and allow to correct errors (since I wrote a few files to another disc while unprotected). This should get me back up and running and with a new fresh drive waiting in the wings. No. Just do what I said. shutdown replace the drive boot up assign the new drive to the slot the old drive was in start will begin rebuild No formatting, no preclearing, no mounting. Yes parity check but shouldn't need to correct.
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