jfs, vxfs, different file system , different ways of increasing

jfs, vxfs, different file system , different ways of increasing

Post by yls1 » Fri, 07 Feb 2003 10:31:40



hi, on jfs, i can increase file system online without dismounting but
on vxfs, i realized that i cant do so... so what are the different
types of file systems around, with their strengths, weaknesses?
 
 
 

jfs, vxfs, different file system , different ways of increasing

Post by Doug Freyburg » Sat, 08 Feb 2003 00:48:02



> hi, on jfs, i can increase file system online without dismounting but
> on vxfs, i realized that i cant do so...

On HP-UX I increase the size of mounted VXFS filesystems regularly.  When I
worked on Solaris full time, I increased the size of mounted VXFS filesystems
regularly as well.  On-line filesystem growth is an additional module on
HP-UX.  I don't recall if it is on Solaris.

Pick one: 1) You need more Veritas modules installed and licensed. 2) You
need to look through more documentation to see how to do it.

My guess is number one in this case.

 
 
 

jfs, vxfs, different file system , different ways of increasing

Post by lao.ignac » Wed, 12 Feb 2003 06:30:54


on hp ux, the online version of jfs will give you this features, not
ordinary jfs.
the online version cost 1965 $ on hp web site, any update of 'normal' jfs is
free.
http://software.hp.com under high availability.



> > hi, on jfs, i can increase file system online without dismounting but
> > on vxfs, i realized that i cant do so...

> On HP-UX I increase the size of mounted VXFS filesystems regularly.  When
I
> worked on Solaris full time, I increased the size of mounted VXFS
filesystems
> regularly as well.  On-line filesystem growth is an additional module on
> HP-UX.  I don't recall if it is on Solaris.

> Pick one: 1) You need more Veritas modules installed and licensed. 2) You
> need to look through more documentation to see how to do it.

> My guess is number one in this case.

 
 
 

1. RAID 10 jfs: surprisingly different bonnie++ file creation times

I'm benchmarking two different disk subsystems on the same server. One
is a 4-disk RAID 10 with 10k drives, the other is a 12-disk RAID 10
with 15k drives. Both have JFS and use MegaRAID controllers for
hardware RAID.

I'm using bonnie++ as part of the benchmarking suite. I'm seeing
results that I expect for file I/O tests. The 12-disk RAID 10 is much
faster for sequential output, as I would expect.

The strange part is that for file creation, the numbers for the 4-disk
RAID 10 are high enough compared to the 12-disk RAID 10 that it's cause
for concern.

At first, I thought it might have something to do with the default
bonnie++ setting of testing 0-byte files for file creation, but I was
able to duplicate the discrepancy with larger files specified.

Here's the 4-disk RAID 10 with -n 128:20000:16:512:

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
foo           16G 46631  94 66317  21 43116   8 43286  82 129767  12
533.6   0
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files:max:min        /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
/sec %CP
   128:20000:16/512  4216  21 108367 100 32620  76  4682  27 95906 100
1169   4

Here's the 12-disk RAID 10 with the same arguments:

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
foo           16G 49728  97 132648  26 74033  13 41362  77 101426   7
596.9   0
                    ------Sequential Create------ --------Random
Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files:max:min        /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
/sec %CP
   128:20000:16/512   923   4 109247 100   621   1   615   3 94779  99
 577   1

One striking thing is the very low CPU usage during the file creation
and deletion on the 12-disk RAID.

Does anyone know anything I should be looking at to help shed some
light on this aspect of the benchmark?

2. Unix question - libraries

3. different file names under different shells

4. PPP and sendmail

5. Is it possible for a file has different names under different shells

6. X failure on server error=111 (fine yesterday)

7. search and delete different files in different directories

8. mail lost when source is pipe within cron job

9. Makefiles involving files in different directories requiring different compilers

10. Different File/Directory Priveledges for 2 Different Groups

11. syslog: Different process messages to different files?

12. different colors for different files when using the "ls" command

13. different colors for different file types