On 11/04/2020 10:21 PM, John Pierce wrote: > is it RAID 0 (striped) or raid1 (mirrored) ?? > > if you wrote on half of a raid0 stripe set, you basically trashed it. > blocks are striped across both drives, so like 16k on the first disk, then > 16k on the 2nd then 16k back on the first, repeat (replace 16k with > whatever your raid stripe size is). > > if its a raid 1 mirror, then either disk by itself has the complete file > system on it, so you should be able to remirror the changed disk onto the > other drive. you MUST do that re-mirror because your two disks are no > longer identical, and reads will alternate between them, so some reads will > get new data and others will get old data, which will be highly chaotic. > > > > On Wed, Nov 4, 2020 at 6:18 PM H <agents at meddatainc.com> wrote: > >> My computer running CentOS 7 is configured to use BIOS RAID0 and has two >> identical SSDs which are also encrypted. I had a crash the other day and >> due to a bug in the operating system update, I am unable to boot the system >> in RAID mode since dracut does not recognize the disks in grub. After >> modifying the grub command line I am able to boot the system from one of >> the harddisks after entering the LUKS password, seemingly without any >> problems but am obviously not running in RAID0 mode. When I booted in >> single-disk mode I am sure there were some new files created on the single >> SSD the system sees but I fairly quickly shut it down until this can be >> fixed. >> >> >> >> My question is: once the operating system fix has been released and I can >> once again boot in BIOS RAID0 mode and decrypting both SSDs (same password >> entered only once of course), how will the BIOS RAID0 react? How will it >> handle new files on one disk, altered timestamps etc.? >> >> >> Thanks. >> >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> https://lists.centos.org/mailman/listinfo/centos >> > How do I do the remirroring once the system is working again? I filed a bug report on bugs.centos.org (https://bugs.centos.org/view.php?id=17830#c37850) but I could use some more assistance to take this further... It was suggested that "if no kernel boots any more, I am pretty sure that your initial ramdisks were rebuild without including a kernel module required by LUKS.you should rebuild them , forcing dracut to include the missing driver. And in the process you might as well upgrade to centos 7.9, kernel 3.10.0-1160.2.2.el7.x86_64 is already available in the CR repository." Unfortunately I do not know how do the above... And I do not know which drivers are missing that I need to include... If anyone would be able to tell me the specific steps I will attempt to do the above. Thank you in advance.