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Bug 2034457

Summary: [RFE] Included thin provisioned volume as a supported target for kdump
Product: Red Hat Enterprise Linux 8 Reporter: Marcus West <mwest>
Component: kexec-toolsAssignee: ltao
Status: CLOSED ERRATA QA Contact: Jie Li <jieli>
Severity: medium Docs Contact: Sujata Kurup <skurup>
Priority: unspecified    
Version: 8.6CC: agk, heinzm, jbrassow, ltao, msnitzer, pdwyer, prajnoha, ruyang, skurup, swachira, thornber, ttuffin, xiawu, yiyan, zkabelac
Target Milestone: rcKeywords: FutureFeature, Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: kexec-tools-2.0.25-4.el8 Doc Type: Enhancement
Doc Text:
.LVM thin provisioned storage volumes supported as the `vmcore` dump target The `kdump` mechanism now supports thin provisioned logical volumes as the `vmcore` target. To configure LVM thin provisioning, complete the following steps: . Create a LVM volume group. + ---- vgcreate vg00 /dev/sdb ---- . Create a LVM thin pool of 10 MB available space. + ---- lvcreate -L 10M -T vg00/thinpool ---- . Create a LVM thin volume with 300 MB of the file system space. + ---- lvcreate -V 300M -T vg00/thinpool -n thinvol mkfs.ext4 /dev/vg00/thinvol ---- . Configure the LVM thin pool threshold to automatically extend the space. + ---- cat /etc/lvm/lvm.conf activation { thin_pool_autoextend_threshold = 70 thin_pool_autoextend_percent = 20 monitoring = 1 } ---- . Enable the LVM thin pool monitoring service for the first kernel. + ---- systemctl enable lvm2-monitor.service systemctl start lvm2-monitor.service ---- . Append the following lines to the `kdump.conf` file to set the LVM thin volume as the `kdump` target. + ---- ext4 /dev/vg00/thinvol path / ---- . Start the `kdump` service. + ---- kdumpctl restart ---- . Verify the configuration by triggering a kernel panic and check if the `vmcore` is saved to `/dev/vg00/thinvol`. As a result, with this enhancement, the `kdump` mechanism now extends capability to save the `vmcore` dump files on thin provisioned storage volumes.
 Story Points: ---
Clone Of:
: 2083475 (view as bug list) Environment:
Last Closed: 2023-05-16 09:02:40 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2141480    
Bug Blocks: 2083475    

Description Marcus West 2021-12-21 01:38:24 UTC 
Description of problem:

Is there any reason why 'thin provisioned volumes' cannot be included as a supported target for kdump?  RHV has been configuring this by default now for a couple of years - it appears to work just find, and I haven't seen any issues where thin-p targets have caused a problem.

If there is some reason why thin-p lv can't be used, we should potentially look at changing the default way kdump is configured for RHV-H hosts. (ie, not put /var/crash on thin-p lv)

Documentation:

[1] https://access.redhat.com/solutions/223773
[2] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/system_design_guide/installing-and-configuring-kdump_system-design-guide#supported-kdump-targets_supported-kdump-configurations-and-targets
[3] /usr/share/doc/kexec-tools/supported-kdump-targets.txt
Comment 19 ltao 2023-01-09 07:46:29 UTC 
This bug depend on dracut >= 049-221.git20221214, which hasn't been released yet.
Comment 30 errata-xmlrpc 2023-05-16 09:02:40 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (kexec-tools bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2953