[Bug 70121] Increasing efficiency of full data journaling

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=70121

--- Comment #3 from Phillip Susi <psusi@ubuntu.com> ---
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 2/6/2014 5:38 AM, bugzilla-daemon@bugzilla.kernel.org wrote:
> Full data journaling provides the ability that it is guaranteed
> that a file will never be saved visible for the user in a damaged
> state (except a hardware defect appears afterwards). But this has
> the disadvantage that the writing througput is ~halfed as all files
> are written 2 times.

It does no such thing.  To do that, a new kernel api is needed to
allow the application to specify where transactions start/stop.  Data
journaling only makes sense for an external journal on an ssd or
similar: then fsync() and friends can return as soon as the data hits
the ssd and rely on it being safely migrated to the hdd in the future.


-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.17 (MingW32)
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBAgAGBQJTF4sKAAoJEI5FoCIzSKrwBpsH/35GAm2iqyNudw0JjJdceYqd
PC+47MwQoJE2kcGLNCPVZLhRdHg+fWF6JKewnGAJXz6jsOIeblWyqyL03x8cCDMB
107ssZzXy8OllhczGp1oMR4q7bM0RiIwDjqD8qPJxYwTOHcoIp7RbyK0ER++LcE6
lISrSCyzyqpgo9o2oRAlAdP8/aioaOyiJbGpIhfH42Je+zG5k3mGwaCIuVvBR+Ef
wm6rOqApxv6JwZy0s12alq6MUFMzE9qb9WTzLiDtPybSFzvUgt5brePi74HdJZHs
JYjtUqk43q8wYCWcDcEjKb8q6/h/HGP296ZhM9CoXjq+HYqqWWXbl9T5F5+Nl6k=
=nADc
-----END PGP SIGNATURE-----

-- 
You are receiving this mail because:
You are watching the assignee of the bug.