Hello Zoltan:
I have about 500 volumes spread across a dozen or so EXT4 filesystems, and
get performance that operates at the maximum throughput of the hardware.
Here is a good primer on the differences. The bottom line - ext4 can
perform better than ext3.
http://www.thegeekstuff.com/2011/05/ext2-ext3-ext4/
Best regards,
Mike, x7942
RMD IT Client Services
On Thu, Jan 28, 2016 at 1:43 PM, Zoltan Forray <zforray AT vcu DOT edu> wrote:
> Mike,
>
> Thanks, again. Very helpful. So, did I understand your earlier
> statement/comment that you disagree with "*Set the LVM read-ahead to 0 for
> all logical volumes on disk systems that provide adaptive read-ahead
> capabilities, for example, enterprise-type disk systems.*"
>
> I also read the statement "*For the Tivoli Storage Manager database and
> logs, use the ext3 file system.*" Whats up with that? They explain why
> you should use ext4 for the storage volumes but no details on ext3 for
> DB/logs?
>
> On Thu, Jan 28, 2016 at 1:05 PM, Ryder, Michael S <
> michael_s.ryder AT roche DOT com
> > wrote:
>
> > Hi Zoltan
> >
> > Here is the reference... I know it is for TSM 7.1, but the reference is
> > specific to RHEL and it's filesystems, which is still relevant to the
> > discussion, I think:
> >
> >
> >
> http://www-01.ibm.com/support/knowledgecenter/SSGSG7_7.1.0/com.ibm.itsm.perf.doc/t_perf_diskos_lnx.html
> >
> > Best regards,
> >
> > Mike, x7942
> > RMD IT Client Services
> >
> > On Thu, Jan 28, 2016 at 11:38 AM, Zoltan Forray <zforray AT vcu DOT edu>
> > wrote:
> >
> > > On Wed, Jan 27, 2016 at 10:05 AM, Ryder, Michael S <
> > > michael_s.ryder AT roche DOT com> wrote:
> > >
> > > > Did you follow the docs and disable RHEL's read-ahead
> > > > caching? If so, you may want to consider enabling it.
> > > >
> > >
> > > Mike,
> > >
> > > Can you expand on your statement about RHEL read-ahead cache and some
> > > tuning/config document you refer to? We were unaware of such a
> document
> > > (or config value). The RHEL read-ahead cache is set to the default of
> > > 128K. Currently all caching is via PERC.
> > >
> > >
> > > --
> > > *Zoltan Forray*
> > > TSM Software & Hardware Administrator
> > > Xymon Monitor Administrator
> > > Virginia Commonwealth University
> > > UCC/Office of Technology Services
> > > www.ucc.vcu.edu
> > > zforray AT vcu DOT edu - 804-828-4807
> > > Don't be a phishing victim - VCU and other reputable organizations will
> > > never use email to request that you reply with your password, social
> > > security number or confidential personal information. For more details
> > > visit http://infosecurity.vcu.edu/phishing.html
> > >
> >
>
>
>
> --
> *Zoltan Forray*
> TSM Software & Hardware Administrator
> Xymon Monitor Administrator
> Virginia Commonwealth University
> UCC/Office of Technology Services
> www.ucc.vcu.edu
> zforray AT vcu DOT edu - 804-828-4807
> Don't be a phishing victim - VCU and other reputable organizations will
> never use email to request that you reply with your password, social
> security number or confidential personal information. For more details
> visit http://infosecurity.vcu.edu/phishing.html
>
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