Tolerance of pre-existing software-RAID #6
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benjamreis
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This was referenced Dec 13, 2022
stormi
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…for user Signed-off-by: Yann Dirson <[email protected]>
Adding disk vendor and model would be useful, but can take too much horizontal space, especially for good old 80x25 resolution, so we use a shorter string with just the disk size for disambiguation. Signed-off-by: Yann Dirson <[email protected]>
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Reasons to have this here include: * don't require changes to srpm when the set of installed files change * make installer development faster by deploying directly to a filesystem This installation process still depends by default on the sm package being installed, but through SM_ROOT variable it can now be run on a dev machine where this is not the case, it just needs an unpacked version of the package. Signed-off-by: Yann Dirson <[email protected]>
mdadm output is like "MD_DEVNAME=127 which results in getHumanDiskName giving a name of "RAID: 127(sda,sdb)". This fixes the problem and gets us "RAID: md127(sda,sdb)" instead. Also slightly improve readability with tuple unpacking. Signed-off-by: Yann Dirson <[email protected]>
This prevents 65-md-incremental.rules from assembling every RAID it identifies, we want to have control over that, so we can reuse a former RAID member for other purposes. Signed-off-by: Yann Dirson <[email protected]>
This causes the "Back" button in primary-disk selection to trigger a rescan for products. This provides support for allowing the user to enable layers of block-device composition (e.g. "md" software RAID, not part of this PR) and then scan those RAID volumes for products. This could even be used for arbitrary manual block-device setup from shell on alternate console. Signed-off-by: Yann Dirson <[email protected]>
It has value for a user expecting an existing product to get notified that none was found. Moreover, this will allow a user to get to the "assemble RAID" choice even when no product was detected. Signed-off-by: Yann Dirson <[email protected]>
… RAID This adds an option to enable *all* RAID devices found. This is less flexible than a more selective mechanism would be, but really simple and covering all known use-cases. It filters out from choices presented to the user both "update of" and "restore to" entries refering to a disk that is part of a md RAID (though in practice only the "update" case is likely to appear). This avoids the case where a user gets those entries before explicitly assembling RAIDs, and thus avoids breaking a RAID by mistake. Signed-off-by: Yann Dirson <[email protected]>
…er to assemble RAID This commit is kept as separate until decided this is the way to go, but would be better squashed. Introduce installer feature flags, and hide the RAID-assembling feature behind the `raid-assemble` flag.
…ound This will avoid issues where users attempt to upgrade from a very old version, and a dom0 kernel driver evolution changed the /dev/disk/by-id/ identifier for the disk, and when the backup became invalid after a hardware change. Signed-off-by: Yann Dirson <[email protected]>
Signed-off-by: Yann Dirson <[email protected]>
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|
Repushed with the same contents as upstream PR, instead of maintaining 2 branches. |
Wescoeur
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May 25, 2023
| results = {} | ||
| nodes = getElementsByTagName(self.top_node, ['assemble-raid']) | ||
| if nodes: | ||
| results['assemble-raid'] = True # possibly useless |
| if nodes: | ||
| results['assemble-raid'] = True # possibly useless | ||
| logger.log("Assembling any RAID volumes") | ||
| rv = util.runCmd2([ 'mdadm', '--assemble', "--scan" ]) |
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Mix of simple and double quotes?
Also do you have a warn with pycodestyle? It seems to me that spaces next to the brackets can trigger a message.
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Primary goal of this PR is avoid a pre-existing software RAID configuration to block usage of the disks that were used for that RAID. Those were at best not shown as available, or caused installation errors when selected (on disks with partitions that were part of a RAID), or even successful-looking installations that were not booting (when attempting to install on a RAID whose members were partitions).
The basic idea is to prevent assembling of pre-existing RAID volumes, and add an explicit option to trigger such assembling to allow upgrade/restore operations on systems installed on RAID. It also prevents, while RAIDs were not assembled, adding upgrade/restore choices to the user, of systems installed on RAID.
This filtering-out of restoration choice is extended to any backup partition referring to a non-accessible device, which as a side-effect will make it impossible to start a "restore" operation of a too-old version, which would be doomed to fail because of a dom0 device id change (as seen e.g. in https://xcp-ng.org/forum/topic/6573/upgrade-xenserver-7-to-xcp-ng-8-2-1).
Note this includes PR xenserver#20 to help the user understand which exact choices are really presented.
Note that some points are not currently addressed:
TODO: