Re: ext4 features (checksums)

[Bill Davidsen]

Avi Kivity wrote:
> Neil Brown wrote:
> > To my mind, the only thing you should put between the filesystem and
> > the raw devices is RAID (real-raid - not raid0 or linear).
> I believe that implementing RAID in the filesystem has many benefits too:
> - multiple RAID levels: store metadata in triple-mirror RAID 1, random 
> write intensive data in RAID 1, bulk data in RAID 5/6
> - improved write throughput - since stripes can be variable size, any 
> large enough write fills a whole stripe
I rather like the idea of allowing metadata to be on another device in 
general, or at least the inodes. That way a very small chunk size can be 
used for the inodes, to spread head motion, while a larger chunk size is 
appropriate for data in some cases.

Larger max block sizes would be useful as well. Feel free to discuss the 
actual value of "larger."

--
Bill Davidsen <davidsen@xxxxxxx>
  Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.

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