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# troubleshootings
Slackbot
09/08/2022, 9:10 AMThis message was deleted.
a
Abhishek Agarwal
09/08/2022, 9:37 AMsegment files on deep storage are zip compressed. files, once downloaded locally, are decompressed. These decompressed files are memory-mapped by historical.
Abhishek Agarwal
09/08/2022, 9:37 AMso there has to a cache in between.
h
Heiner
09/08/2022, 9:37 AMOk, but can it be volatile?
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Abhishek Agarwal
09/08/2022, 9:38 AMNo. it can't be. since you might memory map a segment. if that segment gets deleted from disk but is still memory-mapped and is being queried then bad things can happen.
h
Heiner
09/08/2022, 9:40 AMOk, not sure if I made it clear what I mean. I don't mean volatile as in in-memory, but volatile as in stored in /tmp instead of a proper volume.
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Abhishek Agarwal
09/08/2022, 9:41 AMyou mean like that files can just disappear or deleted by OS - is that right?
h
Heiner
09/08/2022, 9:42 AMI don't think the OS will delete them. But I'm not sure if they will survive a pod restart.
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Abhishek Agarwal
09/08/2022, 5:35 PMthats fine. if the pod restarts and the data goes away, it would be downloaded again from deep storage.