[CentOS] Design changes are done in Fedora

[Warren Young]

On Jan 11, 2015, at 11:05 AM, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote:

> On Sun, January 11, 2015 11:22 am, Sven Kieske wrote:
>> 
>> On 11.01.2015 03:42, James B. Byrne wrote:
>>> What does systemd buy the enterprise that sysinit did not provide?
>>> 
>> systemd has it's ugly downsides, but it
>> _does_ provide much needed features.
> 
> I don't care that _laptop_ with systemd starts 3
> times faster - it's brilliant when you have to start it right on the
> podium few seconds before giving your presentation.

What about all those poor enterprise people who have been arm-twisted into agreeing to SLAs?

If you’ve agreed to provide five nines of availability, a single reboot in the old BIOS + hardware RAID + SysV init world could eat most of the ~5 minutes of downtime per year you’re allowed under that agreement.  EFI + software-defined disk arrays + systemd might cut that to a minute, allowing several reboots per year.

Until we start to see hot-upgradable Linux kernels in mainstream distributions, I’d say that does amount to an “enterprise” feature.

You can extend this argument to four-nines, where you only get 4 minutes of downtime per month.  Looking through the centos-announce list archive, there seems to be roughly one kernel-* RPM change per month.  Do you really want to burn your entire downtime allowance on that?