[systemd-devel] bootchart issues on slow hardware

Holger Winkelmann hw at travelping.com
Mon Mar 18 14:30:39 PDT 2013


Just a quick note, Systemd is a core function on a core OS.
and a coreOS is likely to be started from flash drives. We have
i.e. ATCA devices starting from eUSB Sticks or even SD cards.

After they started the nodes could have high perfomance SSD drives
mounted for payload data, or even not storrage mounted at all.

a PID1 Software should be able to run from Flash Storrage in the
same way as if the filessystem on fast (SSD) drives...


----- Original Message -----
> ]] Reindl Harald
> > but keep in mind that for professional environments for many
> > years SSD is no option for some TB of data and even if
> > the price falls down you have to calculate redundancy for
> > RAID10 environemnts which can not be raplced by a SSD
> > due lack of relieability and no real-world expierience
> > how long they run and how you detect errors before it is
> > too late
> SSDs have been used in professional environments for quite some years
> now.  Cost is still a problem, at least for large amounts of data.  Data
> about reliability is certainly getting there and quite a bit of
> knowledge is already present.  RAID10 is only one option, in many cases
> you will get way better performance with RAID5 or RAID6 and SSDs than
> spinning rust.
> Spinning rust still has its place, but not any place you need reasonable
> I/O performance.
> > SD cards as example are way less relieable than any rotating
> > media because for rotating media you get errors, a SD card
> > happily confirms write-operations for hours and does not
> > change the data on the meda, seen recently that after
> > overwirte with /dev/zero and format with any known FS
> > after pull out and plugin again the same data as two
> > wekks ago was on the card without any single warning or
> > error message besides a bricked phone by overheat
> SD cards compared to SSDs is about the same as floppy drives compared to
> hard drives.  Not particularly relevant.
> --
> Tollef Fog Heen
> UNIX is user friendly, it's just picky about who its friends are
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Holger Winkelmann
email: hw at travelping.com
mobil: +49-171-5594745

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