Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.
Bug 1511034 - vdoformat program erroneously prints "Exceeds maximum number of slabs" for case where index size is too big
Summary: vdoformat program erroneously prints "Exceeds maximum number of slabs" for ca...
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: vdo
Version: 7.5
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Sweet Tea Dorminy
QA Contact: Jakub Krysl
Depends On:
TreeView+ depends on / blocked
Reported: 2017-11-08 15:09 UTC by Bryan Gurney
Modified: 2019-03-06 01:08 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Last Closed: 2018-04-10 15:47:46 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2018:0871 None None None 2018-04-10 15:48:08 UTC

Description Bryan Gurney 2017-11-08 15:09:43 UTC
Description of problem:
If the user creates a VDO volume with --indexMem=10, it will create a VDO volume with a UDS index in dense mode that uses 10 GB of memory, and attempts to reserve 100 GB of storage space on the configured device.  This would call the 

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Install the kmod-kvdo and vdo packages.
2. Add a storage device that has less than the required amount of disk space for a UDS index.
3. Execute "vdo create --name=vdo1 --device=<device> --indexMem=10 --verbose (or use an "--indexMem=" value corresponding to about 1 GB of memory per 10 GB of storage space, in a way that yields insufficient storage space to contain the index).

Actual results:
vdo: ERROR - vdoformat: formatVDO failed on '/dev/sdc': VDO Status: Exceeds maximum number of slabs supported

Expected results:
vdoformat prints a message indicating that there is not enough space to create the UDS index.

Additional info:

Comment 2 Bryan Gurney 2017-11-10 20:03:35 UTC
In a case where the device has enough space to create the index, but does not have enough space to create a full slab (default size 2 GB), this error will appear:

vdo: ERROR - vdoformat: formatVDO failed on '/dev/TEST/backing': VDO Status: Out of space

The test logical volume above was 4 GB in size; it was enough to contain the 2.5 GB UDS index, but not enough to contain a single 2 GB slab.

Comment 3 Bryan Gurney 2017-11-10 20:32:18 UTC
*** Bug 1505748 has been marked as a duplicate of this bug. ***

Comment 5 Jakub Krysl 2017-11-21 13:08:11 UTC
vdo- with 5.5T disk:

# vdo create --name vdo2 --device /dev/sdg --indexMem 1000 --verbose
Creating VDO vdo2
    modprobe kvdo
    vdoformat --uds-checkpoint-frequency=0 --uds-memory-size=1000 /dev/sdg
vdo: ERROR - vdoformat: formatVDO failed on '/dev/sdg': VDO Status: Out of space

THe new indication does not specifically says there is not enough space for the index, but it clearly says it is a space issue, which is good enough.

Comment 8 errata-xmlrpc 2018-04-10 15:47:46 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, and where to find the updated
files, follow the link below.

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

Note You need to log in before you can comment on or make changes to this bug.