Am 18.03.2013 22:30, schrieb Holger Winkelmann: > 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.
well, our ESXi starts also from a SD-card /dev/md1 ext4 29G 6,4G 23G 23% / /dev/md0 ext4 477M 30M 447M 7% /boot /dev/md2 ext4 3,6T 1,6T 2,0T 44% /mnt/data but you won't do this for such environments with RAID10 and 3 RAID-devices over 4 disks and yes such environments will be perfectly useable and fast as long core-functions are not starting do get developed in igorant way what hopefully won't happen hint: you will not reinstall such systems you simply plug out all 4 disks and put them in the new machine for many reasons > ----- 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 >> _______________________________________________ >> systemd-devel mailing list >> [email protected] >> http://lists.freedesktop.org/mailman/listinfo/systemd-devel >> > > -- > -- Reindl Harald the lounge interactive design GmbH A-1060 Vienna, Hofmühlgasse 17 CTO / CISO / Software-Development p: +43 (1) 595 3999 33, m: +43 (676) 40 221 40 icq: 154546673, http://www.thelounge.net/ http://www.thelounge.net/signature.asc.what.htm
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