Mailing List Archive

Console/ssh hangs when starting snapmirror
Greetings,
This is FAS8080 running 8.2.5P37Mode, and we've seen it on 3 of the same
systems that are newly installed (it is for a migration to cmode).

Wondering if anyone has run into this issue. We are experiencing an odd
issue where when starting a snapmirror of serial/SP the console hangs
(messages do appear on the screen). If we ssh into the system it works
fine. If we drop and go back to console it is still hung.

We've also tested starting the snapmirror via ssh and that hangs as well,
and the console works fine. I havent confirmed whether or not if I then
drop that SSH session and relogin if it is still hung.

I've never seen this before on new systems, and wondering if anyone has
seen the exact issue. I have however seen consoles/ssh hang because of
system load or wafl checks, but never with establishing a snapmirror
baseline.


Regards,
Douglas
Re: Console/ssh hangs when starting snapmirror [ In reply to ]
Douglas> This is FAS8080 running 8.2.5P37Mode, and we've seen it on 3
Douglas> of the same systems that are newly installed (it is for a
Douglas> migration to cmode).

Interesting, because I was just doing a bunch of snapmirror initialize
this past week from an 3220 pair to a 3250 7-mode pair running 8.2.x
or something like that. I had no problems with starting my
snapmirrors when I had just done:

ssh filer snapmirror initialize -S 3220:/vol/foo /foo

and it worked just fine, and my 3250s are kinda sorta really old and
over 50% busy, but not really critical.

Douglas> Wondering if anyone has run into this issue. We are
Douglas> experiencing an odd issue where when starting a snapmirror of
Douglas> serial/SP the console hangs (messages do appear on the
Douglas> screen). If we ssh into the system it works fine. If we drop
Douglas> and go back to console it is still hung.

Douglas> We've also tested starting the snapmirror via ssh and that
Douglas> hangs as well, and the console works fine. I havent confirmed
Douglas> whether or not if I then drop that SSH session and relogin if
Douglas> it is still hung.

Douglas> I've never seen this before on new systems, and wondering if
Douglas> anyone has seen the exact issue. I have however seen
Douglas> consoles/ssh hang because of system load or wafl checks, but
Douglas> never with establishing a snapmirror baseline.

Does it ever come back if you wait a long time? Where are you doing
your SSH connections from? I do have to now do the following from my
newer Linux hosts:

ssh -oCiphers=+3des-cbc user@filer

Which might be an issue?

John
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Re: Console/ssh hangs when starting snapmirror [ In reply to ]
Apologies for not following up I had someone reply to me directly
suggesting I used -w, and sure enough ... that was the issue.

Embarrassing a bit!

On Mon, Nov 25, 2019 at 9:09 PM John Stoffel <john@stoffel.org> wrote:

>
> Douglas> This is FAS8080 running 8.2.5P37Mode, and we've seen it on 3
> Douglas> of the same systems that are newly installed (it is for a
> Douglas> migration to cmode).
>
> Interesting, because I was just doing a bunch of snapmirror initialize
> this past week from an 3220 pair to a 3250 7-mode pair running 8.2.x
> or something like that. I had no problems with starting my
> snapmirrors when I had just done:
>
> ssh filer snapmirror initialize -S 3220:/vol/foo /foo
>
> and it worked just fine, and my 3250s are kinda sorta really old and
> over 50% busy, but not really critical.
>
> Douglas> Wondering if anyone has run into this issue. We are
> Douglas> experiencing an odd issue where when starting a snapmirror of
> Douglas> serial/SP the console hangs (messages do appear on the
> Douglas> screen). If we ssh into the system it works fine. If we drop
> Douglas> and go back to console it is still hung.
>
> Douglas> We've also tested starting the snapmirror via ssh and that
> Douglas> hangs as well, and the console works fine. I havent confirmed
> Douglas> whether or not if I then drop that SSH session and relogin if
> Douglas> it is still hung.
>
> Douglas> I've never seen this before on new systems, and wondering if
> Douglas> anyone has seen the exact issue. I have however seen
> Douglas> consoles/ssh hang because of system load or wafl checks, but
> Douglas> never with establishing a snapmirror baseline.
>
> Does it ever come back if you wait a long time? Where are you doing
> your SSH connections from? I do have to now do the following from my
> newer Linux hosts:
>
> ssh -oCiphers=+3des-cbc user@filer
>
> Which might be an issue?
>
> John
>
Re: Console/ssh hangs when starting snapmirror [ In reply to ]
Is the snapmirror going over e0m and saturating it?

On Fri, Nov 8, 2019, 3:53 PM Douglas Siggins <siggins@gmail.com> wrote:

> Greetings,
> This is FAS8080 running 8.2.5P37Mode, and we've seen it on 3 of the same
> systems that are newly installed (it is for a migration to cmode).
>
> Wondering if anyone has run into this issue. We are experiencing an odd
> issue where when starting a snapmirror of serial/SP the console hangs
> (messages do appear on the screen). If we ssh into the system it works
> fine. If we drop and go back to console it is still hung.
>
> We've also tested starting the snapmirror via ssh and that hangs as well,
> and the console works fine. I havent confirmed whether or not if I then
> drop that SSH session and relogin if it is still hung.
>
> I've never seen this before on new systems, and wondering if anyone has
> seen the exact issue. I have however seen consoles/ssh hang because of
> system load or wafl checks, but never with establishing a snapmirror
> baseline.
>
>
> Regards,
> Douglas
>
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