Re: HP9000+LVM+Online

Tony Tyrwhitt-Drake (tonytd@ttyrwhit.demon.co.uk) wrote: : Hewlett Packard have now taken to shipping HP9000s with their LVM : (Logical Volume Manager) product. Online normally operates on raw disc, : that is unmounted disc unknown to unix. Does anyone know what the : benefits/problems are from allocating disc to Online from LVM? : Do you loose performance by having LVM 'between' Online and its raw disc? : With HPUX it is said that you 'have' to use LVM with v10...is this true? : ..does it matter?....does LVM cause Online any problems? Tony, We use LVM extensively with our HP9000 series on OnLine 5.0X systems with no problems. We are not using any of the striping capabilities, but I've experimented a bit with them and see no problems there either. I have close to 200 HP systems in the field now using LVM. Our performance is very good, comparable to other systems using a "straight" raw disk, but I have not directly compared speeds with and without LVM. Joe -- --------------------------------------------------------------------------- Joe Lumbley(jlumbley@netcom.com) Dallas, Texas author of: INFORMIX DBA Survival Guide from Prentice-Hall/Informix Press ISBN 0-13-124314-4 (12431-3) Now available in bookstores orders: orders@prenhall.com (515) 284-6761 fax (515) 284-2607 ----------------------------------------------------------------------------