can someone tell me a good site to go to in order to learn this. please do not recommen nay books because i dont have interest in that. if you know of any good sites with good straight forward explanation on how to split loads on machines that has excessive loading, please let me know
Also,... (1 Reply)
Hi all,
long time ago I posted something, but now, it is needed again :(
Currently, I am handling with a big NFS Server for more than 200 clients, this sever has to work with 256 NFSDs. Because of this huge amount of NFSDs, there are thousands of small write accesses down to the disk and... (3 Replies)
Hi to all,
I'm interested in finding an introduction about Performance Tuning under Unix (or Linux); can somebody please point me in the right direction?
Best regards (1 Reply)
Sorry,
This is out of scope of this group.But I require the clarification pretty urgently.
My Oracle database is parallely enabled.
Still,in a particular table queries do not work "parallely" always.
How is this? (9 Replies)
Hi All,
In last one week, i have posted many questions in this portal. At last i am succeeded to make my 1st unix script.
following are 2 points where my script is taking tooooo long.
1. Print the total number of records excluding header & footer. I have found that awk 'END{print NR -... (2 Replies)
Hi all,
From Googling, I found that the basics used for troubleshooting UNIX/AIX performance issues are commands like vmstat, iostat and sar. I believe these are generic commands regardless of what UNIX flavour is in used, only difference being is the format of the output.
In a real case... (2 Replies)
Please take a look at this system and give your analysis / advice. Can it be tuned to get a better performance?
We are not getting more hardware ressources at the moment.
We have to live with what we have. Application running on the system is SAS. OS is AIX 6.1
Let me know if you need output of... (7 Replies)
Dear all,
I have a Local zone , where users feel that performance is not good.
Is it wise to collect the inputs from the local zone rather than taking from the global zone.
And also Can I tune from Global zone , so that it will reflect in local zone.
Rgds
rj (2 Replies)
Overview:
Introduction
What Does Success Mean?
What Does Performance Mean?
Every Picture is Worth a Thousand Words
Work Like a Physicist
Work Like You Walk - One Step at a Time
Learn to Know Your System
Choose Your Weapons!
Tools of the Trade 1 - vmstat
A Little Theory Along the Way -... (1 Reply)
Discussion started by: bakunin
1 Replies
LEARN ABOUT FREEBSD
nvmecontrol
NVMECONTROL(8) BSD System Manager's Manual NVMECONTROL(8)NAME
nvmecontrol -- NVM Express control utility
SYNOPSIS
nvmecontrol devlist
nvmecontrol identify [-v] [-x] <device id>
nvmecontrol perftest <-n num_threads> <-o read|write> [-p] <-s size_in_bytes> <-t time_in_sec> <namespace id>
nvmecontrol reset <controller id>
nvmecontrol logpage <-p page_id> [-x] <device id> <namespace id>
nvmecontrol firmware [-s slot] [-f path_to_firmware] [-a] <device id>
DESCRIPTION
NVM Express (NVMe) is a storage protocol standard, for SSDs and other high-speed storage devices over PCI Express.
EXAMPLES
nvmecontrol devlist
Display a list of NVMe controllers and namespaces along with their device nodes.
nvmecontrol identify nvme0
Display a human-readable summary of the nvme0 IDENTIFY_CONTROLLER data.
nvmecontrol identify -x -v nvme0ns1
Display a hexadecimal dump of the nvme0 IDENTIFY_NAMESPACE data for namespace 1.
nvmecontrol perftest -n 32 -o read -s 512 -t 30 nvme0ns1
Run a performance test on nvme0ns1 using 32 kernel threads for 30 seconds. Each thread will issue a single 512 byte read command. Results
are printed to stdout when 30 seconds expires.
nvmecontrol reset nvme0
Perform a controller-level reset of the nvme0 controller.
nvmecontrol logpage -p 1 nvme0
Display a human-readable summary of the nvme0 controller's Error Information Log. Log pages defined by the NVMe specification include Error
Information Log (ID=1), SMART/Health Information Log (ID=2), and Firmware Slot Log (ID=3).
nvmecontrol logpage -p 1 -x nvme0
Display a hexidecimal dump of the nvme0 controller's Error Information Log.
nvmecontrol firmware -s 2 -f /tmp/nvme_firmware nvme0
Download the firmware image contained in "/tmp/nvme_firmware" to slot 2 of the nvme0 controller, but do not activate the image.
nvmecontrol firmware -s 4 -a nvme0
Activate the firmware in slot 4 of the nvme0 controller on the next reset.
nvmecontrol firmware -s 7 -f /tmp/nvme_firmware -a nvme0
Download the firmware image contained in "/tmp/nvme_firmware" to slot 7 of the nvme0 controller and activate it on the next reset.
AUTHORS
nvmecontrol was developed by Intel and originally written by Jim Harris <jimharris@FreeBSD.org>.
This man page was written by Jim Harris <jimharris@FreeBSD.org>.
BSD March 26, 2013 BSD
02-27-2019
