Re: Does nilfs2 do any in-place writes?

["Mark Trumpold" <markt-qk0wvQ0ghJwAvxtiuMwx3w@public.gmane.org>]

Hello All,

I am wondering what the impact of in-place writes of the
superblock has on SSDs in terms of wear?

I've been stress testing our system which uses Nilfs, and
recently I had a SSD fail with the classic messages indicating
low level media problems -- and also implicating Nilfs as trying
to locate a superblock (I think).

Following is a partial dmesg list: 

[    7.630382] Sense Key : Medium Error [current] [descriptor]
[    7.630385] Descriptor sense data with sense descriptors (in hex):
[    7.630386]         72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00 
[    7.630394]         05 ff 0e 58 
[    7.630397] sd 0:0:0:0: [sda]  
[    7.630399] Add. Sense: Unrecovered read error - auto reallocate failed
[    7.630401] sd 0:0:0:0: [sda] CDB: 
[    7.630402] Read(10): 28 00 05 ff 0e 54 00 00 08 00
[    7.630409] end_request: I/O error, dev sda, sector 100601432
[    7.635326] NILFS warning: I/O error on loading last segment
[    7.635329] NILFS: error searching super root.


Best regards,
Mark T.



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