[Bug 1877617] Re: Automatic scans cause instability for cloud use cases

[Ben Swartzlander]

** Description changed:

+ [Impact]
+ 
  When using iSCSI storage underneath cloud applications such as OpenStack
  or Kubernetes, the automatic bus scan on login causes problems, because
  it results in SCSI disks being registered in the kernel that will never
  get cleaned up, and when those disks are eventually deleted off the
  server, I/O errors begin to accumulate, eventually slowing down the
  whole SCSI subsystem, spamming the kernel log, and causing timeouts at
  higher levels such that users are forced to reboot the node to get back
  to a usable state.
+ 
+ [Test Case]
+ 
+ TBD...
+ 
+ [Regression Potential]
+ 
+ These changes have been proven safe by 3 years of soak time in the
+ RedHat ecosystem, so I don't see much risk to taking them into Ubuntu.
+ They apply cleanly to the most recent versions of focal, bionic, and
+ xenial.
+ 
+ The change introduces a new config option in iscsid.conf but the default
+ is to do exactly what it used to do. Only users who explicitly change
+ this option will get altered behavior, and
+ 
+ [Other Info]
  
  RedHat discovered this problem more than 3 years ago and fixed it
  upstream.
  
  https://bugzilla.redhat.com/show_bug.cgi?id=1422941
  
  I had hoped that Debian would eventually pick up the version in which it
  was fixed, but another LTS has gone by without picking up the newer
  upstream version, and this is a critical problem, so I propose
  backporting the fixes.
  
  The 2 patches that need porting are:
  https://github.com/open-iscsi/open-iscsi/pull/40
  https://github.com/open-iscsi/open-iscsi/pull/49
- 
- These changes have been proven safe by 3 years of soak time in the
- RedHat ecosystem, so I don't see much risk to taking them into Ubuntu.
- They apply cleanly to the most recent versions of focal, bionic, and
- xenial.

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https://bugs.launchpad.net/bugs/1877617

Title:
  Automatic scans cause instability for cloud use cases

Status in open-iscsi package in Ubuntu:
  New

Bug description:
  [Impact]

  When using iSCSI storage underneath cloud applications such as
  OpenStack or Kubernetes, the automatic bus scan on login causes
  problems, because it results in SCSI disks being registered in the
  kernel that will never get cleaned up, and when those disks are
  eventually deleted off the server, I/O errors begin to accumulate,
  eventually slowing down the whole SCSI subsystem, spamming the kernel
  log, and causing timeouts at higher levels such that users are forced
  to reboot the node to get back to a usable state.

  [Test Case]

  TBD...

  [Regression Potential]

  These changes have been proven safe by 3 years of soak time in the
  RedHat ecosystem, so I don't see much risk to taking them into Ubuntu.
  They apply cleanly to the most recent versions of focal, bionic, and
  xenial.

  The change introduces a new config option in iscsid.conf but the
  default is to do exactly what it used to do. Only users who explicitly
  change this option will get altered behavior, and

  [Other Info]

  RedHat discovered this problem more than 3 years ago and fixed it
  upstream.

  https://bugzilla.redhat.com/show_bug.cgi?id=1422941

  I had hoped that Debian would eventually pick up the version in which
  it was fixed, but another LTS has gone by without picking up the newer
  upstream version, and this is a critical problem, so I propose
  backporting the fixes.

  The 2 patches that need porting are:
  https://github.com/open-iscsi/open-iscsi/pull/40
  https://github.com/open-iscsi/open-iscsi/pull/49

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