Re: btrfs: What to do with large growing files?

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On 1/12/21 2:21 PM, Richard Shaw wrote:

I would think a blockchain is roughly equivalent to a database but I have no idea if the blocks were downloaded in order (appended) or randomly (inserted). The single file (data.mdb) ended up being 96GB in total. It seems to have settled down as I expected but it took about 2 days to download so it was a bit frustrating using my computer at that time. Anything that tried to access /home (my spinning btrfs drive) would basically stall including youtube videos that ran out of cache, browser tabs, etc.
98GB in 48 hours is an average of 500kB/s.
A spinning disk can seek 100 time per second, was the filesystem doing a seek every about 5kB of data?
Looks unreasonable, especially since I would not expect the access to be random at all in a blockchain.
Would be interesting to do the same operation in different conditions (SSD <-> HDD, ext4 <-> btrfs).

Regards.

--
   Roberto Ragusa    mail at robertoragusa.it
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