I'm investigating an issue we're seeing on a couple ARM servers, and it looks like this maybe the same issue here. What it looks like is that the mpt3sas driver is being downloaded/loaded just before the partitioner starts. Since the kernel is configured to scan for SCSI devices asynchronously, the partitioner ends up being displayed before disk detection has completed. When the reporter goes "Back" and re- enters the partitioner, the disks now appear because scanning has completed in the meantime.
The proposal in comment #3 would pre-load the mpt3sas driver into the initrd instead of fetching it from the mirror. This would make it available earlier in the installer which, for this case, may give mpt3sas enough time to complete its asynchronous scan before getting to the partitioner phase. But, I don't think it fixes the general problem. I suspect systems with lots of disks and/or automated (preseeded) installs would still be at risk of running into this race. Back-in-the-day, there was a scsi_wait_scan module that you could load, and insmod would block until all asynchronous scans were complete. That no longer exists, and I haven't been able to find a reasonable userspace replacement. One thing we *could* do is add scsi_mod.scan=sync to d-i before the "---", which would force synchronous scanning during install time, but leave asynchronous scanning enabled for the runtime. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1779815 Title: [Ubuntu 18.04.01][BostonLC][mpt3sas] installer does not detect any LSI based SAS/md raid device Status in The Ubuntu-power-systems project: Triaged Status in debian-installer package in Ubuntu: Confirmed Status in linux package in Ubuntu: Invalid Bug description: == Comment: #0 - ABDUL HALEEM <abdha...@in.ibm.com> - 2018-07-02 03:55:33 == ---Problem Description--- Ubuntu 18.04.01 ppc64el installer does not detect LSI3008 base SAS disks / MD RAID devices Used 20101020ubuntu543 version to install http://ports.ubuntu.com/ubuntu-ports/dists/bionic/main/installer-ppc64el/current/images/netboot/ubuntu-installer/ppc64el/ Contact Information = abdha...@in.ibm.com ---uname output--- Linux ltc-boston21 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 17:59:00 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux Machine Type = BostonLC ---boot type--- Network boot Installer fails to detect the LSI SAS disks / RAID MD device =======console error log======= ?????????????????????????? [!!] Partition disks ??????????????????????????? ? ? ? Note that all data on the disk you select will be erased, but not ? ? before you have confirmed that you really want to make the changes. ? ? ? ? Select disk to partition: ? ? ? ? /dev/nvme0n1 - 491.5 GB NVMe Device ? ? /dev/nvme1n1 - 98.3 GB NVMe Device ? ? ? ? <Go Back> ? ? ? ??????????????????????????????????????????????????????????????????????????? <Tab> moves; <Space> selects; <Enter> activates buttons To make sure it detects the disks I had to <Go back > <Go back > Detect disks-->Guided partitioning--> Guided - use entire disk ?????????????????????????? [!!] Partition disks ??????????????????????????? ? ? ? Note that all data on the disk you select will be erased, but not ? ? before you have confirmed that you really want to make the changes. ? ? ? ? Select disk to partition: ? ? ? ? /dev/nvme0n1 - 491.5 GB NVMe Device ? ? /dev/nvme1n1 - 98.3 GB NVMe Device ? ? SCSI3 (0,0,0) (sda) - 4.0 TB SEAGATE ST4000NM0075 ? ? SCSI3 (1,0,0) (sdb) - 199.9 GB LSI Logical Volume ? ? SCSI3 (0,2,0) (sdc) - 2.0 TB ATA ST2000NM0125-1YZ ? ? ? ? <Go Back> ? ? ? ??????????????????????????????????????????????????????????????????????????? IPR had similar issue reported #164932 and fixed with 4.15.0-20, looks installer need a fix for LSI (mpt3sas) devices too == Comment: #2 - SEETEENA THOUFEEK <sthou...@in.ibm.com> - 2018-07-03 02:01:47 == 164932 - refers LP1751813 == Comment: #3 - SEETEENA THOUFEEK <sthou...@in.ibm.com> - 2018-07-03 02:02:51 == Jul 2 08:49:52 anna-install: Installing mdadm-udeb Jul 2 08:49:52 disk-detect: No Intel/DDF RAID disks detected. Jul 2 08:49:52 anna-install: Installing dmraid-udeb Jul 2 08:49:52 disk-detect: No Serial ATA RAID disks detected Jul 2 08:49:53 check-missing-firmware: looking at dmesg again, restarting from \[ 330.659712\] Jul 2 08:49:53 check-missing-firmware: timestamp found, truncating dmesg accordingly Jul 2 08:49:53 check-missing-firmware: saving timestamp for a later use: Jul 2 08:49:53 check-missing-firmware: /dev/.udev/firmware-missing does not exist, skipping Jul 2 08:49:53 check-missing-firmware: /run/udev/firmware-missing does not exist, skipping Jul 2 08:49:53 check-missing-firmware: no missing firmware in loaded kernel modules Jul 2 08:49:53 main-menu[1425]: (process:8933): ERROR: unsupported sector size 4096 on /dev/sda. Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 3 (pipe:[38926]) leaked on pvs invocation. Parent PID 8940: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 4 (/dev/hvc0) leaked on pvs invocation. Parent PID 8940: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 5 (/dev/hvc0) leaked on pvs invocation. Parent PID 8940: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 6 (/dev/hvc0) leaked on pvs invocation. Parent PID 8940: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): ERROR: unsupported sector size 4096 on /dev/sda. Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 3 (pipe:[38926]) leaked on pvs invocation. Parent PID 9224: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 4 (/dev/hvc0) leaked on pvs invocation. Parent PID 9224: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 5 (/dev/hvc0) leaked on pvs invocation. Parent PID 9224: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 6 (/dev/hvc0) leaked on pvs invocation. Parent PID 9224: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): ERROR: unsupported sector size 4096 on /dev/sda. Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 3 (pipe:[38926]) leaked on pvs invocation. Parent PID 9401: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 4 (/dev/hvc0) leaked on pvs invocation. Parent PID 9401: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 5 (/dev/hvc0) leaked on pvs invocation. Parent PID 9401: /bin/sh Jul 2 08:49:53 main-menu[1425]: (process:8933): File descriptor 6 (/dev/hvc0) leaked on pvs invocation. Parent PID 9401: /bin/sh Jul 2 08:49:54 main-menu[1425]: INFO: Menu item 'partman-base' selected Jul 2 08:52:55 main-menu[1425]: (process:9704): mount: mounting /dev/nvme1n1p1 on /tmp/tmp.6DICJ7 failed: Invalid argument To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1779815/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
