>>> On 3/22/2011 at 06:17 AM, Samir Reddahi <[email protected]> wrote: > I created a volume group with 144 MOD-9 disks. Usually when I create > logical volumes, I create them with stripes equalling the number of > volumes in the volume group. > > But apparently you can only define a maximum of 128 stripes on a logical > volume. > What do I do best in this situation? > Is it OK to use the maximum 128 for a 144 disk volume group? Could it > cause a problem, for example fragmentation? > Or do I use a divisor of 144, e.g. 72?
As Frank Schwede pointed out, if you have an LV with X stripes, you need to have free extents on that many PVs if/when you want to extend that LV. That tends to be a _very_ big inhibitor as time goes on. In your case that could possibly mean you would need to add another 128 PVs all at once if you needed to extend that LV. LVM striping, simply as a matter of course, doesn't make a lot of sense. I would only recommend it in specific instances where performance requires it. 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/
