TSM version 7.1.1.something iirc
reads from TSM are fast, restores are almost as fast as reading from disk
with cp.
I have only looked at Linux with nmon, 100% disk active but really low
amounts of MB/s during backups
multiple sessions don't make a difference either.


On Fri, Nov 13, 2015 at 3:12 PM, Ryder, Michael S <michael_s.ryder AT roche DOT 
com
> wrote:

> Stefan I forgot to ask - what version of TSM?
>
> Have you tried watching from Linux with collectl, iotop or something
> similar while performing storage pool writes?
>
> Are reads from storage pools also slow?
>
> Best regards,
>
> Mike <http://rbbuswiki.bbg.roche.com/wiki/ryderm_page:start>, x7942
> RMD IT Client Services <http://rmsit.dia.roche.com/Pages/default.aspx>
>
> On Fri, Nov 13, 2015 at 9:06 AM, Stefan Folkerts <
> stefan.folkerts AT gmail DOT com>
> wrote:
>
> > >Can you provide details on the physical storage?
> >
> > exp2524 via Megaraid 5120
> > EXT3 filesystem
> > SLES11 SP3
> > Yes, we tuned the sysctl.conf file
> > I can't get to the devclass definition right now but the default DISK
> > device class has the same issue as my FILE device class as soon as there
> is
> > a storage on top of it.
> > I don't think it's the battery since a cp or dd on linux is blazing along
> > at 220-300MB/s, but TSM can only do 10-15MB/s to a disk / file based
> > storage pool.
> >
> > I know TSM can use certain flags when writing to storagepools that change
> > the cache behaviour, what I don't know is what I need to set it to for it
> > to be fast. :-)
> >
> > Regards,
> >    Stefan
> >
> >
> > On Fri, Nov 13, 2015 at 1:26 PM, Ryder, Michael S <
> > michael_s.ryder AT roche DOT com
> > > wrote:
> >
> > > Stefan
> > >
> > > Can you provide details on the physical storage?  What filesystem is in
> > > use?  What version of Linux?  Did the installer configure and tune OS
> > > parameters as indicated by TSM installation documentation?  Are you
> > allowed
> > > to share the devclass and storage pool definitions?
> > >
> > > Mike
> > >
> > > On Friday, November 13, 2015, Stefan Folkerts <
> stefan.folkerts AT gmail DOT com
> > >
> > > wrote:
> > >
> > > > Hello all,
> > > >
> > > > We have a situation where one of our customers is showing very slow
> > > > performance on writing to a disk or file type storage pool on disk.
> > > >
> > > > Writing to tape with TSM is fast.
> > > > Writing a database backup to disk is fast (this writes to the same
> > drives
> > > > but it writes to the devclass definition and not the storagepool
> > > definition
> > > > of course)
> > > > Writing to a disk or file type storagepool is very slow (10-15MB/s)
> > > > Writing to the same disk in Linux is fast (200+ MB/s)
> > > >
> > > > I found and read this article:
> > > > http://www-01.ibm.com/support/docview.wss?uid=swg21137676
> > > >
> > > > But before I make a call with IBM I was hoping some of you might know
> > the
> > > > correct settings for disk/file type storagepools on this type of
> local
> > > > storage.
> > > >
> > > > Regards,
> > > >     Stefan
> > > >
> > >
> > >
> > > --
> > >
> > > Best regards,
> > >
> > > Mike <http://rbbuswiki.bbg.roche.com/wiki/ryderm_page:start>, x7942
> > > RMD IT Client Services <http://rmsit.dia.roche.com/Pages/default.aspx>
> > >
> >
>