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тАО05-02-2008 03:12 AM
тАО05-02-2008 03:12 AM
lvol mirroring in HP 11iV3
pls suggest ,as i m new on this platform,
I have created 1 pv & 1 vg, in this VG ,i created 2 LVs now pls tell me can i mirrored these 2 LVs with each other or i have to mirror each across other PV.
Thanks in Advance.
regards
vjta
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тАО05-02-2008 03:49 AM
тАО05-02-2008 03:49 AM
Re: lvol mirroring in HP 11iV3
Mirroring is done to save data from disk disasters. So logically you have to mirror lvols on other physical disk. That means you need to have one more PV in this case.
For mirroring LV to other specific PV you can use lvextend command:
#lvextend -m 1 /dev/vg00/lvolX /dev/dsk/cXtYdZ
Where, -m denotes number of mirror copies
-=ShRi=-
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тАО05-02-2008 04:09 AM
тАО05-02-2008 04:09 AM
Re: lvol mirroring in HP 11iV3
Mirroring is used for high-availablity. Hence you never would want to mirror a logical volume that resides one physical volume to the somewhere else on the same physical volume! This defeats the whole intent.
LVM enforces this with the 'strict' property. You establsh this (by default) when you create a logical volume. See the manpages for 'lvcreate' and for 'lvextend'.
Regards!
...JRF...
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тАО05-02-2008 10:57 AM
тАО05-02-2008 10:57 AM
Re: lvol mirroring in HP 11iV3
for mirroring u need more than one physical volume(1 pv + 1 pv)
then u can use lvextend -m command for doing it
ok
thanks
sajjad
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тАО05-02-2008 06:27 PM
тАО05-02-2008 06:27 PM
Re: lvol mirroring in HP 11iV3
As all mentioned, mirroring is for redundancy. So, there is n meaning to mirror a lvol onto a same disk.
Still, you can mirror a lvol within a PV by making lvol as Non-Strict policy
#lvcreate / lvchange -s n
Best Regards,
Ramesh
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тАО05-02-2008 09:51 PM
тАО05-02-2008 09:51 PM
Re: lvol mirroring in HP 11iV3
Thanks for ur valuable reply.now my doubt is cleared.
regards
Vjta