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