Hi Baptiste, Baptiste Jonglez <deb...@bitsofnetworks.org> (2016-09-21): > When creating a RAID1 array in the debian-installer and using it for > the installation, mdadm immediately starts syncing the disks of the > RAID array. > > This is a bad idea, because the subsequent install will be really slow > on rotational disks (linear disk access by mdadm and random disk > access by dpkg). On a fairly recent computer with 2 SATA disks, the > installation took around 20 minutes before even arriving to the > tasksel step.
Well, I can understand the argument, but the user could very well expect disks to be in mirror mode as soon as possible, and not wait until a few days after the installation before the initial sync ends… > I can see two solutions: > > 1) lower the speed of the syncing operation, by setting the > "dev.raid.speed_limit_max" sysctl setting to e.g. 1000; I'm not sure it would be a good idea to stick a hardcoded value there, even if we were to lower the available bandwidth… Too many different cases, be it about actual hardware, disk sizes, etc. KiBi.
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