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#1 (**permalink**) 01-05-2008, 10:46 AM

How much it takes for a VG to be mirrored.?

I have a VG(50 disks ,10G each) which containes LV(125G).

It is taking a long time to mirror around 5 hrs.

Is it normal ?

#2 (**permalink**) 01-05-2008, 10:46 AM

probably depends on what sort of drive you have and when you're doing
it (I'd recommend a time when there's not much system activity)

Having said that -I've always heard that it "takes a while"

Generally it's operation I'll crontab for late in the night when no one
cares or at the very least, kick off as I leave for the day

saggar wrote:
> How much it takes for a VG to be mirrored.?
>
> I have a VG(50 disks ,10G each) which containes LV(125G).
>
> It is taking a long time to mirror around 5 hrs.
>
> Is it normal ?

#3 (**permalink**) 01-05-2008, 10:46 AM

Yeah..I am using SAN drives right now.
there is no system activity at the time when i started that.
I have started that in the night only.

thanks
mikelaff@gmail.com wrote:
> probably depends on what sort of drive you have and when you're doing
> it (I'd recommend a time when there's not much system activity)
>
> Having said that -I've always heard that it "takes a while"
>
> Generally it's operation I'll crontab for late in the night when no one
> cares or at the very least, kick off as I leave for the day
>
> saggar wrote:
> > How much it takes for a VG to be mirrored.?
> >
> > I have a VG(50 disks ,10G each) which containes LV(125G).
> >
> > It is taking a long time to mirror around 5 hrs.
> >
> > Is it normal ?

#4 (**permalink**) 01-05-2008, 10:48 AM

saggar wrote:
> How much it takes for a VG to be mirrored.?
>
> I have a VG(50 disks ,10G each) which containes LV(125G).
>
> It is taking a long time to mirror around 5 hrs.
>
> Is it normal ?
>

If these LUNs are SAN based (as you say) it then depends on how the disk
array connected to the SAN is configured. I have some seen some disk
arrays configured and sliced in lots of lovely ways, then someone comes
along and mirrors a VG when the underlying LUNs are already configured
in a hardware redundant manner i.e. a RAID-5 or RAID-6 configuration so
the VG doesn't need to be mirrored and doing so may introduce
performance issues.

Also some low-end Disk Arrays don't have very large caches or
write-cache is not enabled so if you are mirroring LUNs, the lack of
cache could have an effect.

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