Re: ext4 features (checksums)

Bill Davidsen
2006-07-05T12:03:40Z

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@tmr.com>
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.