3140 should be more than adequate for that workload, especially with that number of spindles (15K disks should be able to handle 250 IOPS each) -- given of course that the aggregates are laid out correctly and actually making use of the spindle count. I'd be interested to see your sysconfig and a statit output or a full perfstat (you could see if you have latx to see what's going on -- latx.netapp.comhttp://latx.netapp.com -- instructions are provided online for uploading perfstat output). 100ms latency seems very high, like maybe he's running a spindle bound aggregate. Have you checked whether he's running them on an aggr0 with 3 drives or maybe at 95%+ utilization on the aggregate he is using? System housekeeping might be keeping the aggregate very busy, but I'd expect CPU utilization to be much higher in that case.
Statit/Perfstat will probably reveal more useful information as you troubleshoot this issue than info from OCSM too. I'd be happy to look over your statit output if you want to post a section.
Like Andrei says, card placement for NVRAM shouldn't make a difference other than the logs complaining loudly (and often) about it.
Anthony Bar 650.207.5368tel:650.207.5368 tbar@berkcom.commailto:tbar@berkcom.com
On Jul 7, 2015, at 2:53 AM, Borzenkov, Andrei <andrei.borzenkov@ts.fujitsu.commailto:andrei.borzenkov@ts.fujitsu.com> wrote:
In HA pair usable NVRAM size is reduced in half (second half is used to mirror partner NVRAM). Whether or not it will have visible impact depends on your workload.
Other than that I do not see how NVRAM slot would affect performance.
-----Original Message----- From: toasters-bounces@teaparty.netmailto:toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Stephen Stocke Sent: Tuesday, July 07, 2015 12:34 PM To: toasters@teaparty.netmailto:toasters@teaparty.net Subject: NVRAM6 Card Installed in the Wrong Slot
Hello Toasters
We have an old 3040 running as a single controller in a lab. The head had previously been part of an HA pair and the NVRAM6 card was therefore installed in slot 3 (correct for HA systems). For a single controller the card is supposed to be in slot 1.
I'm curious to know what the controller is doing with the NVRAM card? Is it using it at all or just writing everything through straight to disk? Could this cause slower than expected performance?
Thanks, Steve
__ Background Info __
A colleague recently asked advice on some poor performance with this system in his VMware lab and the first thing that jumps out is the log messages complaining about the card being in the wrong slot. This misconfiguration will be corrected shortly.
The system is running 8.1.4 7-mode if that make a difference. The controller has 2 loops of DS14MK4 shelves (168 15K FC drives) and is serving handful iSCSI LUNs to a small vSphere cluster (2 ESXi servers).
While looking at stats in OCSM 3.2, I observed >100ms iSCSI write latency with a load of ~300 IOPS and very low CPU utilisation (<20%). -------------------------------------------------------------------------------- This e-mail message has been scanned for Viruses and Content and cleared by MailMarshal --------------------------------------------------------------------------------
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