Verry serious problem with ZFS & 12.0

[Julien Cigar]

On Thu, Aug 29, 2019 at 12:45:47AM +0200, Albert Shih wrote:
> Hi
> 
> After update 4 servers from 11.2 to 12.0 without any problem, wait few
> weeks to see if everything work well, and it did. I just upgrade my mail
> server. 
> 
> During the upgrade I also upgrade all firmware for the hardware.
> 
> And now I got a very serious issue with my server. 
> 
> Configuration :
> 
>   Dell PowerEdge R740Xd with H730P, 192 Go Ram, 2 SAS mechanical disk for the system,
>   2 SSD (in a zfs pool) for the mail index (cyrus), and 28 mechanical disk
>   (in a second zfs pool) for the mailbox. 
> 
> The problem:
> 
>   After running few days the zfs pool with the 2 SSD are not responding. 
> 
>   The system are perfectly working. 
> 
>   The second zpool (mechanical disk) are perfectly working. 
>   
>   I got zero log, zero message in the console or in dmesg.
> 
>   The arc_size are correct, it's around 70-75 %. 
> 
>   The moment the zfs pool become not responding are random, not related to
>   any activity (human or cron).
> 
>   The only option I pass for the kernel related to ZFS are vfs.zfs.min_auto_ashift=12 and 
>   vfs.zfs.prefetch_disable=1. Without the second one the system no
>   responding (under 11.2) when the server send (through zfs send) the data to another
>   server.
> 
>   After the first problem I make a zfs upgrade, thinking maybe that's the
>   problem so I'm not sure I can downgrade to 11.2 (and 11.2 are EOL) 
> 
> In your opinion :
> 
>   1/ What should I do to try to find the problem ?
> 
>   2/ Do you think that's a hardware/firmware problem or FreeBSD problem,
>   the point is the second zpool are working perfectly so I'm thinking at
>   some firmware/hardware/compatibility problem.
> 
> 
> Regards.

looks like PR 236480

see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236480

> 
> 
> --
> Albert SHIH
> DIO bâtiment 15
> Observatoire de Paris
> Heure local/Local time:
> Thu 29 Aug 2019 12:26:55 AM CEST
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-- 
Julien Cigar
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