Re: SDS and RAW, It's possible?

On Thu, Jun 12, 2008 at 3:10 AM, Isidre Pons Roca <ipons@base.altanet.org> wrote: > We are planning to move from IDS 9.40.UC4 in Solaris 9 to IDS 11.5.FCx in > Solaris 10. > > Now We are using raw devices in SAN and HDR. > > New functionalities in IDS 11.5 are the use of Shared Disks, something like > HDR but with less disk usage, less network traffic, less check point time > and some other advantages over HDR. > > Anybody use Shared disks in raw devices? I can think of no reason why raw devices would not work - which may show a lack of imagination but probably doesn't. Shared Disk Secondaries (SDS nodes) can be added to a system with minimal setup because the disk information is already set up - because it is shared. The downside is that if the shared disks themselves become unusable, then all the SDS nodes using those disks become unusable, whereas in a classic HDR setup, you have a second set of disks that can be used even when the first set goes down. This is a reasonable trade-off; disk drives are pretty reliable. But you must be aware of the trade-offs. -- Jonathan Leffler #include <disclaimer.h> Email: jleffler@earthlink.net, jleffler@us.ibm.com Guardian of DBD::Informix v2008.0513 -- http://dbi.perl.org/ "Blessed are we who can laugh at ourselves, for we shall never cease to be amused." NB: Please do not use this email for correspondence. I don't necessarily read it every week, even.