On Thu, Sep 30, 2010 at 12:37 PM, Grigori Solonovitch < [email protected]> wrote:
> I do not have XIV, but I am using DS8100 with FATA disks 1TB 7200 RPM. > I am using AIX multipath access (4 paths) via 2-ports adapter and SAN > switches(4Gb/s each port). I have defined primary and copy storage polls for > device class FILE (JFS2 file systems under AIX). Formatting volume speed is > 210MB/s for single volume. It can reach 400MB/s and more for a few > processes. > As far as I know, SATA disks 1TB or 2TB 7200 RPM are used in XIV. > So you should have at least the same speed as for DS8100 (XIV is much > newer!). > I think you need to check for problems with: > 1) host connections; > 2) or for fragmentation in raw logical volumes for device class DISK (for > example, all volumes were formatted in parallel, not one by one). > > as for 2), because of the XIV block allocation algorithm, this is unlikely... 1) would be a good hint, that's what we started looking at when we first detected that TSM was not performing as good as we thought it should. All links are performing optimally. I agree that an XIV should be at least comparable to a DS8100, but for now, we're nowhere even close to the figures you mention. Do note that the DS8000 uses the SDD driver (I assume) and XIV is limited to AIX MPIO. I am curious as to which verion of TSM you are running, including the exact patch level. -- Met vriendelijke groeten, Remco Post, PLCS
