--> ... you have a filesystem of lvm blocksize smaller than the raid-strip size ...
I would rather say the write block size *must* be N times the raid-stripe size for RAID-5! If the array in question is RAID-5 and lets assume 16 kB stripe - neither 64 kB write-block (read-before-write) nor 128 kB block (one full-write + one read-before-write) will provide optimal performance on a typical DAS arrays. Either good SAN array should be used or member set *must* be 2^n+1 (3,5,9) disks. Zlatko Krastev IT Consultant Remco Post <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> 03.09.2003 21:34 Please respond to "ADSM: Dist Stor Manager" To: [EMAIL PROTECTED] cc: Subject: Re: DSMFMT takes forever ( 15 hours). 100 gb On Wednesday, Sep 3, 2003, at 18:22 Europe/Amsterdam, Ochs, Duane wrote: > Does anyone know of or had problems with formatting additional space > for > diskpools ? > > TSM server : AIX 5.1 ML3 64-bit enabled. 2GB memory 2 cpu H80 > > Disk type : 6 member raid set about 700 GB > > JFS2 > > Trying to format 100gb diskpool. Each time I have tried it brings the > TSM > server to almost a stand still. TSM is up on the box but nothing is > running > during 8 hours of the format. Should be more than enough time to format > 100gb of space. > > Any ideas ? possibly, you have a filesystem of lvm blocksize smaller than the raid-strip size, this especially a problem with the ssa raid adpaters (those suck big time IMNSHO) Using a huge blocksize helps.... >> Duane Ochs >> Enterprise Computing >> >> Quad/Graphics >> >> Sussex, Wisconsin >> 414-566-2375 phone >> 414-917-0736 beeper >> [EMAIL PROTECTED] >> www.QG.com >> >> >> -- Met vriendelijke groeten, Remco Post SARA - Reken- en Netwerkdiensten http://www.sara.nl High Performance Computing Tel. +31 20 592 8008 Fax. +31 20 668 3167 "I really didn't foresee the Internet. But then, neither did the computer industry. Not that that tells us very much of course - the computer industry didn't even foresee that the century was going to end." -- Douglas Adams