Hi all, I guess that IBM started using the posix fs call to allocate storage. The command finishes in seconds, but at least on AIX the actual I/O still lasts forever. Some operating systems might be able to allocate disk space a lot quicker. It all boils down to the particular unix flavor implementation of sparse files... Windoze never had sparse files, so there dsmfmt was always instant....
On 2 nov. 2011, at 13:49, Zoltan Forray/AC/VCU wrote: > I had an odd situation occur involving formatting disk storage volumes on > a Linux server. > > In the past, when creating and formatting storage pool volumes, a 300GB > volume would normally take an hour or more. I could watch the space being > allocated, piece-by-piece until it reached 300GB and then wait for the > formatting to complete. This process was usually so resource intensive > (never understood why???) doing something like an LS would take many > seconds to respond. > > Yesterday, I had a need to create new volumes on a recently rebuilt server > - RH Linux 5.6 and TSM server 6.2.3.0. > > Imagine my surprise when a 300GB volume was created in 2-seconds! > Furthermore, I create 9-300GB volumes as fast as I could enter the > commands! > > I thought for sure there was some kind of problem but all the error logs I > checked were clean. I figured if I started using them they would start > registering errors but nothing happened! Everything seems to be working > just fine. > > So, what gives? > > Is there some dramatic change in 6.2.3.0 (this is my first server upgraded > to this level) effecting the behavior of creating disk storage pool > volumes? It can't be the hardware since this is a 3+ year old machine. I > have newer, bigger, beefier, faster servers that still take a long time to > format storage volumes? > > > Zoltan Forray > TSM Software & Hardware Administrator > Virginia Commonwealth University > UCC/Office of Technology Services > [email protected] - 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 -- Met vriendelijke groeten/Kind Regards, Remco Post [email protected] +31 6 248 21 622
