At 87% it is certainly possible that wafl doesn't have enough contagious free space to write a chain in a single pass...slowing things down substantially.
Are your volumes thick provisioned? That could cloud the equation.
--JMS
From: Fred Grieco [mailto:fredgrieco@yahoo.com] Sent: Friday, September 13, 2013 3:16 PM To: Jordan Slingerland; Jeff Mohler Cc: Toasters@teaparty.net Subject: Re: high CP_reads/writes ratio
The prod one is 87%. The replication one is 71% but it was much higher during disaster recovery testing.
I'll run a reallocate measure on the DR side this weekend and see what comes back.
________________________________ From: Jordan Slingerland <Jordan.Slingerland@independenthealth.commailto:Jordan.Slingerland@independenthealth.com> To: Jeff Mohler <speedtoys.racing@gmail.commailto:speedtoys.racing@gmail.com>; Fred Grieco <fredgrieco@yahoo.commailto:fredgrieco@yahoo.com> Cc: "Toasters@teaparty.netmailto:Toasters@teaparty.net" <Toasters@teaparty.netmailto:Toasters@teaparty.net> Sent: Friday, September 13, 2013 3:12 PM Subject: RE: high CP_reads/writes ratio
Are your aggregates more then 65-85% full?
From: toasters-bounces@teaparty.netmailto:toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Jeff Mohler Sent: Friday, September 13, 2013 3:09 PM To: Fred Grieco Cc: Toasters@teaparty.netmailto:Toasters@teaparty.net Subject: Re: high CP_reads/writes ratio
Wafl free space fragmentation most likely. Reallocate all volumes in the affected aggregate.
Do not reallocate the _aggregate_.
Sent from my iPhone
On Sep 13, 2013, at 1:06 PM, Fred Grieco <fredgrieco@yahoo.commailto:fredgrieco@yahoo.com> wrote: What kinds of things can cause a high CP_reads/writes ratio? And what can I do about it?
I have an Oracle system with ASM that doing writes in a 15 minute cycle, and it causes a lot of writes with CP reads. The oracle ASM luns are basically the only thing on the aggregate. Disk alignment is fine (which is the first thing I thought of). I've attached a screenshot of the Oncommand graph for one of the disks in this aggr-- not sure if that will come through.
The filer is a 3220 with 8.1.2 7-mode. Fibre channel attach, and there are about 20 luns under two volumes.
TIA,
Fred
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