Re: ESXi 6.0u2 loosing connection to targets

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Please keep me in CC, I am not subscribed.

Sorry for the delay in replying.

On Sun, Feb 19, 2017 at 10:23:53PM -0800, Nicholas A. Bellinger wrote:
> On Thu, 2017-02-16 at 07:30 -0500, William Thompson wrote:
> > Kernel is:
> > Linux it-iscsi 4.6.0-1-amd64 #1 SMP Debian 4.6.2-2 (2016-06-25) x86_64 GNU/Linux
> > 
> 
> Thanks for your bug-report.
> 
> Using a v4.6.x kernel, I think there are two issues to consider.
> First, note v4.6.x is not a long term stable kernel, so it's missing a
> number of regression bug-fixes from the past year that you'll likely
> encounter against ESX hosts with VAAI enabled.
> 
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target?h=linux-4.4.y&id=60ba156dda2c11ff7a44d78ec64abd21b9813115
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target?h=linux-4.4.y&id=f318588b758514c35f0a9227195178a3b2b4b733
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target?h=linux-4.4.y&id=56661d2b89b2a549be04f37dcf824c39d7aca9c6

Debian kernel, I just upgraded to 4.9.x

> These three are the minimum patches to v4.6.y that you'll need.
> However, considering v4.6.y is not a long-term stable kernel, I'd very
> much recommend instead you use the latest v4.1.y, v4.4.y or anything >=
> v4.8.y in order to get the full set of bug-fixes from upstream.
> 
> Second, there is a well known ESX 5.5u2+ bug with VMFS5 that is
> triggered by targets that support VAAI AtomicTestandSet (emulate_caw=1
> in LIO backend attribute speak).
> 
> https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2113956
> http://cormachogan.com/2015/04/17/heads-up-ats-miscompare-detected-between-test-and-set-hb-images/
> http://www.thevirtualist.org/alert-application-outages-using-vaai-ats-on-vsphere-5-5-update2-vsphere-6-0/
> https://www-304.ibm.com/support/docview.wss?uid=ssg1S1005201
> http://h20565.www2.hpe.com/hpsc/doc/public/display?sp4ts.oid=75953&docId=mmr_sf-EN_US000005979&lang=en-us&cc=us&docLocale=en_US
> 
> The result is that data stores will eventually go offline, if the ATS
> heartbeat logic for VMFS5 is not explicitly disabled on all ESX hosts.
> There have many, many users who have hit this, and based on the
> recommendation of all the other vendors above, it's a must disable in
> order to get a stable working ESX 5.5u2+ + VAAI setup.

If it keeps up with 4.9.x, I'll take a look at this.

Thanks.
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