topic Re: Mirror question in Operating System - HP-UX

Mirror question

Ralf Buchhold — Fri, 11 Mar 2005 09:30:35 GMT

Hello
what does it mean:
Mirror Consitency: NO

Thanks
Ralf

Re: Mirror question

RAC_1 — Fri, 11 Mar 2005 09:36:21 GMT

It means at the time of vg activation, mirror consistency will not be checked. man lvcreate. Check otions -c and -M (-c options is effective only with -M option specified.)
By default it is on.

Anil

Re: Mirror question

Uday_S_Ankolekar — Fri, 11 Mar 2005 09:48:32 GMT

This means MWC(Mirror Write Cache) is off
This approach is useful when running an application program (such as a database) that has its own means of maintaining or recoveringconsistent data, such as transaction logfiles.
-USA..

Re: Mirror question

Duncan Edmonstone — Fri, 11 Mar 2005 10:05:42 GMT

Typically this is turned OFF for swap volumes (why bother re-silvering a swap volume after a reboot?)

HTH

Duncan

Re: Mirror question

Rajeev Tyagi — Fri, 11 Mar 2005 10:08:15 GMT

Ralf,

It means in case of system crash stale extents will not be synchronized automatically during reboot or VG activation. You will have to use lvsync to manually synchronize the mirrored logical volume.