AF:
NF:0
PS:10
SRH:1
SFN:
DSR:
MID:<20080424131639.1c7d4d5f@ripper>
CFG:
PT:0
S:andy.sharp@onstor.com
RQ:
SSV:onstor-exch02.onstor.net
NSV:
SSH:
R:<jhernandez@css.glasshouse.com>,<dl-cstech@onstor.com>
MAID:1
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Date: Thu, 24 Apr 2008 13:19:50 -0700
From: Andrew Sharp <andy.sharp@onstor.com>
To: "Jairo Hernandez" <jhernandez@css.glasshouse.com>
Cc: "'dl-cstech'" <dl-cstech@onstor.com>
Subject: Re: case 7925--[Ask.com--NCPU of stats show ldavg command is high
 for low traffic]
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In-Reply-To: <200804241911.m3OJBmg15113@mailhost-rtp.css.glasshouse.com>
References: <200804241911.m3OJBmg15113@mailhost-rtp.css.glasshouse.com>
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The load average is not a percentage, it is more like the Richter
scale: it's logarithmic and you don't need to worry too much about it
until it reaches at least 3.5.

http://en.wikipedia.org/wiki/Load_%28computing%29

On Thu, 24 Apr 2008 14:11:44 -0500 "Jairo Hernandez"
<jhernandez@css.glasshouse.com> wrote:

> Hey guys,
> 
>  
> 
> Customer is asking the following regarding this performance stats.
> System is running 3.1.0.7-DMIP and although customer says the vsvrs
> are not in "production" there are still read/writes occurring for his
> own tesing
> 
>  
> 
> **************************************************************
> 
>  
> 
> We currently are hosting NFS with the backend storage being of 3Par.
> The NFS is being used both for traditional NFS to mount filesystem
> used on clients as well as hosting Filesystems for virtual Servers. 
> 
> When i do command: stats show ldavg on the systems hosting the FS, the
> output is : 
> 
> ONah8r16u1t-a WEBIMAGES> stats show ldavg 
> NCPU ACPU FP1 FP2 FC 
> 0.781 0.018 0.303 0.367 0.079 
> 
> 
> My concern is that the NCPU is hight at 78% and the load is not much
> in terms of ops/second at all: 
> 
> 
> ONah8r16u1t-a> vsvr stats all 
> ------------------------------------------------------------------------
> -------------------------- 
> | VS          | Speed (Ops/sec)         | Throughput  (Bytes/sec) | 
> ------------------------------------------------------------------------
> -------------------------- 
> |                | NFS | CIFS | NFS | CIFS    |  NFS |  CIFS | NFS |
> CIFS | |                | (IN) | (IN) | (OUT) | (OUT) | (IN) | (IN) |
> (OUT) | (OUT) | 
> ------------------------------------------------------------------------ 
> -------------------------- 
> | SPORTS | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> | UTILS | 6 | 0 | 6 | 0 | 24.38K | 0 | 1.05K | 0 | 
> | WEBIMAGES | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | BACKEND | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | MAXIMAGES | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> | NEWS | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | XEN3POOL_DELL | 5 | 0 | 5 | 0 | 35.25K | 0 | 850 | 0 | 
> | CHAT | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> | DOCS | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> | XEN1POOL_SUN | 14 | 0 | 14 | 0 | 87.31K |  0 | 2.35K | 0 | 
> | XEN5POOL_DELL | 2710 | 0 | 2710 | 0 | 17.60M |  0 | 448.86K | 0 | 
> | MY | 1 | 0 | 1 | 0 | 189 | 0 | 193 | 0 | 
> | TEST1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | TEST2 | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> | VS_MGMT_1387 | 0 | 0 | 0 | 0 | 0 |  0 | 0 | 0 | 
> ------------------------------------------------------------------------
> -------------------------- 
> | SPORTS | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | UTILS | 4 | 0 | 4 | 0 | 24.70K |  0 | 815 | 0 | 
> | WEBIMAGES | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | BACKEND | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | MAXIMAGES | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | NEWS | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | XEN3POOL_DELL | 5 | 0 | 5 | 0 | 47.29K | 0 | 1.04K | 0 | 
> | CHAT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | DOCS | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | XEN1POOL_SUN | 26 | 0 | 26 | 0 | 179.90K | 0 | 4.27K | 0 | 
> | XEN5POOL_DELL | 2025 | 0 | 2025 | 0 | 23.42M | 0 | 344.09K | 0 | 
> | MY | 0 | 0 | 0 | 0 | 23 | 0 | 23 | 0 | 
> | TEST1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | TEST2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 
> | VS_MGMT_1387 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
> 
> 1) why would the NCPU be running at such high percentage and what can
> i do , as the stuff being hosted on these systems are not being even
> hit with traffic at all, as production traffic has yet to be pushed
> out there.
> 
>  
> 
> **************************************************************
> 
>  
> 
> Thanks,
> 
>  
> 
> jairo
> 
