op 29-08-14 23:52, Adam Talbot schreef: > I have found placing /boot + MBR on a DOM (Disk on module) to be very > effective. Maybe a good DOM is more reliable then a good harddisk. But it's not redundant. > Perhaps we should be asking how the MBR got broken in the first place? I am using mdadm about 12 years, and I've seen many times that a system did not come up after booting. And when I removed the boot-disk, it did come up. I must say it's less then for a few years, maybe I am using better disks. But I am looking for something what's better. What helps, is that there is something like IPMI. So when there is a problem and IPMI is working fine, you can boot by hand from another disk. With regards, Paul van der Vlis. > On Fri, Aug 29, 2014 at 2:47 PM, Paul van der Vlis <paul@xxxxxxxxxxxxx> wrote: >> Hi Roberto, >> >> op 29-08-14 22:44, Roberto Spadim schreef: >>> i use two or more boot disks, if the first raid1 disk don't boot bios >>> go to second boot disk, third, etc etc, >> >> In my opinion this only works when the boot-disk is completely defect or >> removed. Not when the data in the MBR on that boot-disk is corrupt. >> >> Or did you test this, or do you have other reasons to believe that your >> bios will handle this correct? >> >> With the boot-disk I mean the disk what's in the bios the first disk. So >> this could also be the second raid1 disk. Or an USB stick. >> >>> you must write grub to mbr of each disk >> >> Of course. >> >> With regards, >> Paul van der Vlis. >> >>> i'm using dell server r410 if i'm not wrong >>> >>> 2014-08-29 17:31 GMT-03:00 Paul van der Vlis <paul@xxxxxxxxxxxxx>: >>>> Hello, >>>> >>>> I like mdadm and I am using it many years. But in my opinion it has one >>>> disadvantage: when the MBR of the boot-disk is corrupt, the machine will >>>> not boot. >>>> >>>> A bios could check this. Wait for some kind of signal from Grub or >>>> Linux, and after a timeout boot from another disk. But I don't know >>>> about a bios with that feature. >>>> >>>> A PCIe card could do something like that, but I don't know about such a >>>> PCIe card. >>>> >>>> Is there such hardware? >>>> What do you do to avoid this problem? >>>> >>>> With regards, >>>> Paul van der Vlis. >>>> >>>> >>>> >>>> >>>> -- >>>> Paul van der Vlis Linux systeembeheer, Groningen >>>> http://www.vandervlis.nl/ >>>> >>>> -- >>>> 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 >>> >>> >>> >> >> >> >> >> >> -- >> Paul van der Vlis Linux systeembeheer, Groningen >> http://www.vandervlis.nl/ >> >> -- >> 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 > -- > 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 > -- Paul van der Vlis Linux systeembeheer, Groningen http://www.vandervlis.nl/ -- 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
