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.ry...@roche.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.folke...@gmail.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.ry...@roche.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.folke...@gmail.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> > > > > > >
