On Sat, Feb 13, 2010 at 11:21 PM, <david@xxxxxxx> wrote: > On Sat, 13 Feb 2010, Michael Evans wrote: > >> On Sat, Feb 13, 2010 at 5:51 PM, Volker Armin Hemmann >> <volkerarmin@xxxxxxxxxxxxxx> wrote: >>>> >>>> 0.90 has a very bad problem, which is that it is hard to distinguish >>>> between a RAID partition at the end of volume and a full RAID device. >>>> This is because 0.90 doesn't actually tell you the start of the device. >>>> >>>> Then, of course, there are a lot of limitations on size, number of >>>> devices, and so on in 0.90. >>> >>> but it is the only format supporting autodetection. >>> >>> So - when will autodetection be introduced with 1.X? And if not, why not? >>> >>> All I found was 'autodetection might be troublesome' and nothing else. >>> But dealing with initrds is troublesome too. Pure evil even. >>> >>> Gl?ck Auf, >>> Volker >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> >> I remember hearing that 1.x had /no/ plans for kernel level >> auto-detection ever. That can be accomplished in early-userspace >> leaving the code in the kernel much less complex, and therefore far >> more reliable. >> >> In other words, 'auto-detection' for 1.x format devices is using an >> initrd/initramfs. > > hmm, I've used 1.x formats without an initrd/initramfs (and without any > conifg file on the server) and have had no problem with them being > discovered. I haven't tried to use one for a boot/root device, so that may > be the difference. > > David Lang Yes, that is the difference. You must have a more traditional simple block device and filesystem drivers compiled in. You have no need for extra drivers or higher level device detection and evaluation (with user-set policies to determine operation). Anything past root-fs mount can happen in normal user-space before logins are enabled. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
