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It would be useful if you provided the actual error messages, so we can see where the problem is.
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<div class="">What command did you run on the OST?<br class="">
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<div class="">Does the OST still show that it has data in it (e.g. "df" or "dumpe2fs -h" shows lots of used blocks)?<br class="">
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<div class="">On Mar 25, 2020, at 10:05, Gong-Do Hwang <<a href="mailto:grover.hwang@gmail.com" class="">grover.hwang@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Dear Lustre,
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<div class="">Months ago when I tried to add a new disk to my new Lustre FS, I accidentally target the mkfs.lustre to a then mounted OST partition of another Lustre FS. Weird enough the command passed through, and without paying attention to it, I umount the
partition months later and couldn't mount it back, then I realized the mkfs.lustre command was legit.</div>
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<div class="">But my old lustre FS worked well through these months, so I guess the data in that OST is still there. But now the permanent CONFIG/mountdata is the new one, and I can still see my old config in the previous value.</div>
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<div class="">My question is is there any way I can write back the old CONFIG/mountdata and still keep all my files in that OST?</div>
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<div class="">I am using Luster 2.13.0 for my mgs/mdt/ost</div>
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<div class="">Thanks for your help and I really appreciate it!</div>
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<div class="">Grover</div>
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<div>Cheers, Andreas</div>
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<div>Andreas Dilger</div>
<div>Principal Lustre Architect</div>
<div>Whamcloud</div>
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