Visit Our UNIX and Linux User Community


EXT3 Performance tuning


 
Thread Tools Search this Thread
Special Forums Hardware Filesystems, Disks and Memory EXT3 Performance tuning
# 1  
Old 06-07-2005
EXT3 Performance tuning

Hi all,

long time ago I posted something, but now, it is needed again Smilie

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 causing a high wait i/o Smilie

Now, i hope to be able to tune the ext3 filesystem in that way, that the wait i/o could be decreased, I even don't need to completely get rid of it...

Firstly I planed to move the journal to a different location, but because this is a shared disk within a HA failover configuration, both systems have to have the journal on the shared disk.
The next idea was to tune the fs via the commit rate within the fstab file, but during my tests I saw no performance increasement of the filesystem... the best performance I git was the default setting, which is every 5s.

So, I don't have a clue how to tune the fs further to decrease the wait i/o , do you have any ideas ?

Thanks in advance

Malcom
# 2  
Old 06-07-2005
What kind of storage are you running the fs on?
/Peter
# 3  
Old 06-08-2005
Hi Peter,

it is a Raid 5 system connected to both systems and contains important configuration data and 3rd party applications including the data.

The systems are working with heartbeat, and the shared disk will be taken over by the next system.

/malcom
# 4  
Old 06-15-2005
I am not quite sure whether we are on the right track, without further metrix posted. Even a default ext3 config is not likely to be the bottleneck of this wait i/o issue. What about RAID strip unit size? What about NFS options (noac, cache, rsize, wsize, etc)? Especially noac. I am quoting related section from nfs man page:
----------------------------------------------------------------------
noac Disable all forms of attribute caching entirely. This
extracts a server performance penalty but it allows two
different NFS clients to get reasonable good results
when both clients are actively writing to common
filesystem on the server.
-------------------------------------------------------------------------

Previous Thread | Next Thread
Test Your Knowledge in Computers #718
Difficulty: Medium
Alan Minsky invented the first head-mounted graphical display in 1933.
True or False?

10 More Discussions You Might Find Interesting

1. AIX

IBM AIX I/O Performance Tuning

I have a IBM Power9 server coupled with a NVMe StorWize V7000 GEN3 storage, doing some benchmarks and noticing that single thread I/O (80% Read / 20% Write, common OLTP I/O profile) seems slow. ./xdisk -R0 -r80 -b 8k -M 1 -f /usr1/testing -t60 -OD -V BS Proc AIO read% IO Flag IO/s ... (8 Replies)
Discussion started by: c3rb3rus
8 Replies

2. Solaris

System Check Performance Tuning

Hello Forum, Well I am fairly new to this Solaris os thing. One thing I would like to check for system health and performance. I know the codes like prstat,vmstat,sar,iostat,netstat,prtdiag -v, What else does a want to be sys admin have to look for when checking a solaris box? I know... (3 Replies)
Discussion started by: br1an
3 Replies

3. Solaris

Solaris Performance tuning

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)
Discussion started by: jegaraman
2 Replies

4. AIX

Performance issue / tuning advice

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)
Discussion started by: firefox111
7 Replies

5. UNIX for Advanced & Expert Users

Performance diagnosis & tuning

Hi, I am facing a strange issue. Application is deployed in a cluster with 2 Unix nodes (with same configuration). On one node the application is working fine but on another node we see this behavior I found using vmstat- when the server is not yet started everything is OK; when you start the... (3 Replies)
Discussion started by: ash.abrol
3 Replies

6. Shell Programming and Scripting

Performance Tuning

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)
Discussion started by: Amit.Sagpariya
2 Replies

7. Shell Programming and Scripting

Oracle-performance tuning

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)
Discussion started by: kthri
9 Replies

8. UNIX for Dummies Questions & Answers

Performance Tuning

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)
Discussion started by: domyalex
1 Replies

9. UNIX for Dummies Questions & Answers

Performance tuning.

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)
Discussion started by: TRUEST
1 Replies

10. UNIX for Dummies Questions & Answers

Anyone else see a performance hit from ext3

I reinstalled my Linux box with RedHat 7.2 and used the ext3 journaling file system. This thing is a pig now. There isn't much running on the box, and performance is sad. (1 Reply)
Discussion started by: 98_1LE
1 Replies

Featured Tech Videos