** Changed in: linux (Ubuntu Cosmic)
Status: New => In Progress
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => dann frazier (dannf)
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1821408
Title:
scsi: libsas: Support SATA PHY connection rate unmatch fixing during
discovery
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
New
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
In Progress
Status in linux source package in Disco:
In Progress
Bug description:
[Impact]
SATA disks may be unusable
will not be usable when:
- The disk is connected through a SAS expander
- Controller uses a libsas-based driver (mvsas, aic94xx, hisi_sas)
- link rate between expander & disk is greater than link between controller
and expander
[Test Case]
See conditions in "Impact"
Can be simulated with:
for f in /sys/class/sas_phy/phy-1\:*/maximum_linkrate; do
echo "3.0 Gbit" | sudo tee $f
done
[Fix]
cec9771d2e954 scsi: libsas: Support SATA PHY connection rate unmatch fixing
during discovery
[Regression Risk]
Impact is restricted to drivers that use libsas: mvsas, aic94xx & hisi_sas.
Code change is all within an "if" statement that meets these restrictions.
A bug in this code could possibly reduce the speed of an otherwise working
disk connection.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821408/+subscriptions
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