12-02-2010 02:41 AM
Hi,
Does FastResync in Storage Foundation for Windows 5.1 SP1 track the changes between regular mirrors in a volume (not snapshot mirrors)? My customer uses SFW to mirror large volumes between two data centres, and he wants a quick resync of these volumes if he has a temporary storage outage in one data centre.
I know this works in SF for Unix, but I've never tried this before in SFW.
Thanks, Alistair.
Solved! Go to Solution.
12-05-2010 10:14 PM
Hi,
You can enable FastResync for SFW volumes using vxvol set fastresync=on
You have to do it before the mirror is detached and it must remain on until its re-attached (so best to just leave it on)
When you enable FR it will create a DCO volume to keep track of the changes. Its a good idea to mirror the DCO as well.
So same as Unix really :)
12-02-2010 08:41 PM
Dirty Region Logging is used for regular mirrors. Simply right-click on the volume and select Log -> Add.
Extract from Admin Guide:
When a dirty region log is created, a log subdisk is added to the volume. Multiple
logs can be associated with a single mirrored volume as a fault-tolerant measure.
Depending on the number of logs configured, this may result in degraded
performance.
12-05-2010 10:14 PM
Hi,
You can enable FastResync for SFW volumes using vxvol set fastresync=on
You have to do it before the mirror is detached and it must remain on until its re-attached (so best to just leave it on)
When you enable FR it will create a DCO volume to keep track of the changes. Its a good idea to mirror the DCO as well.
So same as Unix really :)
12-09-2010 07:57 AM
You can enable FMR for a regular mirrored volume if you have the FlashSnap license (this option provides FMR functinality). If you do not have a FlashSnap license, you will only be able to use a DCO which will be used after system failures.
12-09-2010 09:20 AM
DCO log is the Data Change Object that is created when FastResync (FlashSnap) is enabled on a volume.
DRL (Dirty Region Log) is the log that can be added to track changes on normal mirrors.