VxVM log types

[Marianne]

Quick solution for somebody out there:

I'm looking for a TechNote that lists and explains the different volume log types in VxVM (DCO, DCM, DRL, etc).

I have seen this TN before, but for the life of me, cannot find it this morning.

PS: I know exactly what they are - just looking for the TN that I can send to a customer...

[g_lee]

Marianne,

Not a technote, but the closest thing I could find that mentioned them all on the same page / gives a (very) brief overview/description of each type was the vxassist man page (under Keywords -> addlog)

http://sfdoccentral.symantec.com/sf/5.0MP3/solaris/manpages/vxvm/man1m/vxassist.html#HDR.4

-------------------------
addlog
Adds a log or DCO to a volume.

DCO is a data change object, used for Persistent FastResync. Note: This operation is only supported for version 0 DCOs.

DRL is a dirty region log, used for speedy recovery of mirrors after a system crash.

Sequential DRL is a form of DRL that is optimized for volumes that are written to sequentially, such as database log volumes.

Note: For volumes with version 20 DCOs, DRL and sequential DRL are supported within the DCO volume itself. You can specify the dcoversion=20 attribute to the vxassist make command to create a volume with a version 20 DCO, or you can use the vxsnap prepare command to add a version 20 DCO to a volume. You cannot use the vxassist addlog command to add a version 20 DCO to a volume.

DCM is a data change map, used for fast resynchronization of a secondary RVG with its primary.

Mirrored volumes are associated with DRL or sequential DRL logs.

RAID-5 volumes are associated with RAID-5 logs.

Replicated volumes are associated with DCM logs.
-------------------------

Not exactly what you're looking for, but hope it helps?

Grace

[Gaurav_S · Accepted solution]

Hi Marianne,

Found this one:

http://www.symantec.com/docs/TECH19706

though tagged for windows... hope it helps..

Gaurav

[Marianne]

Thanks Grace and Gaurav!!

Grace, I have found something similar: http://sfdoccentral.symantec.com/sf/5.0/linux/manpages/vxvm/vxassist_1m.html

Gaurav - I'm pretty sure that's the TN I had in mind...

I'm sitting with a slight dilemma where I need to correct a Consultant who recommended the following to a customer:

"Add data change object to mirrors..."

I wanted to include a Symantec URL in my suggestion to change 'dco' to drl'.

 My biggest dilemma now is - who do I award the Solution to??

[g_lee]

hehehe ;)

It only seems fair to award the solution to Gaurav, since you were looking for a technote, and he managed to find it for you :)

[Gaurav_S]

:) Thanks Grace,

Marianne, I really wouldn't have minded if it was awarded to Grace also as he to pointed towards the information ...  thanks anyways.

TN searching has changed a lot now... it happens many times for me that I can't find the right TN I am looking for ... I need to use advance google features to get it right then..

G