So that might have been my problem (but not necessarily limited to that one).
I was on Suse 10 system. I initially stripped the LVM. When it got nearly full, I tried to add a pack. Couldn't do it. So I went back and recreated the LVM without striping and I could add a pack. I want to say that the documentation at that time, also said you couldn't add packs to a striped LVM, but that was a while ago. Anyway, it hasn't been a performance issue. But that is due to us not needing the I/O performance. Thanks for the update. I'm updating my notes. Tom Duerbusch THD Consulting On Wed, Oct 10, 2012 at 12:53 PM, Mark Post <[email protected]> wrote: > >>> On 10/10/2012 at 11:35 AM, "Duerbusch, Tom" <[email protected]> > wrote: > > > Just speaking to LVM... > > > > Striping the data across multiple volumes (which in modern dasd is > already > > stripped in the Raid array), would give you the best performance. > > Especially if you can strip across multiple DS8000 (or other dasd > > subsystems). > > > > But you can also use LVM as a pool of DASD, with no striping involved. > > > > In case 1, if you need to expand the LVM pool, it is a hassle. It might > > mean backing up, reformatting and reloading the data. In any case, it > > involves a knowledgeable person and most likely, downtime. > > This is simply not true. Expanding a striped LV can be done dynamically > with no downtime. The only aspect that is different from a non-striped LV > is that you have to have enough free space on as many different PVs as the > number of stripes you have. That is, if you did an "lvcreate -i 2" then > when you do an lvextend/lvresize, you have to have free space available on > 2 different PVs in the pool. An "lvcreate -i 3" means you need free space > on 3 PVs, etc. > > A lot of people tend to add space to a volume group one PV at a time. If > you're using striped LVs, that won't work unless you make sure that the > existing PVs have enough free space on them to accommodate additional > stripes being allocated. > > > Mark Post > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO LINUX-390 or > visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > -- ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
