ZFS secondarycache on SSD problem on r255173

[Vitalij Satanivskij]

Yes 

We have 15 servers, all of them have problem while using with patch fo ashift, sh we rollback path (for r255173) 
and all of them works for a week without that's problem's. Yesterday one of of servers was updated to stable/10 (beta1) 

wich include patch  and after around 12 hours of works l2arc begin et errors like that 

kstat.zfs.misc.arcstats.l2_cksum_bad
kstat.zfs.misc.arcstats.l2_io_error 


For now patch disabled in ower production.


Please note we have very heavy load on zfs pool so 90GB arc and 3x180Gb L2arc have very big hit's on it  on it.


SSD used for cache's is intel ssd 530 series smart for all devices in in normal states's
no bad values on it.

Steven Hartland wrote:
SH> Have you confirmed the ashift changes are the actual cause of this
SH> by backing out just those changes and retesting on the same hardware.
SH> 
SH> Also worth checking your disks smart values to confirm there are no
SH> visible signs of HW errors.
SH> 
SH>     Regards
SH>     Steve
SH> 
SH> ----- Original Message ----- 
SH> From: "Vitalij Satanivskij" <satan at ukr.net>
SH> To: "Dmitriy Makarov" <supportme at ukr.net>
SH> Cc: "Steven Hartland" <killing at multiplay.co.uk>; "Justin T. Gibbs" <gibbs at freebsd.org>; "Borja Marcos" <borjam at sarenet.es>; 
SH> <freebsd-current at freebsd.org>
SH> Sent: Wednesday, October 16, 2013 9:01 AM
SH> Subject: Re: ZFS secondarycache on SSD problem on r255173
SH> 
SH> 
SH> > Hello.
SH> >
SH> > Patch brocke cache functionality.
SH> >
SH> > Look at's Dmitriy's mail from  Mon, 07 Oct 2013 21:09:06 +0300
SH> >
SH> > With subject ZFS L2ARC - incorrect size and abnormal system load on r255173
SH> >
SH> > As patch alredy in head and BETA it's not good.
SH> >
SH> > Yesterday we update one machine up to beta1 and forgot about patch. So 12 Hours and cache broken... :((
SH> >
SH> >
SH> >
SH> > Dmitriy Makarov wrote:
SH> > DM> The attached patch by Steven Hartland fixes issue for me too. Thank you!
SH> > DM>
SH> > DM>
SH> > DM> --- Исходное сообщение --- 
SH> > DM> От кого: "Steven Hartland" < killing at multiplay.co.uk >
SH> > DM> Дата: 18 сентября 2013, 01:53:10
SH> > DM>
SH> > DM> ----- Original Message ----- 
SH> > DM> From: "Justin T. Gibbs" <
SH> > DM>
SH> > DM> --- 
SH> > DM> Дмитрий Макаров
SH> > DM> _______________________________________________
SH> > DM> freebsd-current at freebsd.org mailing list
SH> > DM> http://lists.freebsd.org/mailman/listinfo/freebsd-current
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SH> > 
SH> 
SH> 
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