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тАО03-07-2005 03:21 AM
тАО03-07-2005 03:21 AM
moving EMC to XP1024
we have a vclass connected to an EMC using raid 1. we want to move to an XP1024 using raid 5. both are currently connected to the vclass and seen by the OS. is it possible to mirror the emc raid 1 to the XP1024 raid 5 at the lvm level? or is it easier to just cpio filesystems over?
thx in advance
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тАО03-07-2005 03:36 AM
тАО03-07-2005 03:36 AM
Re: moving EMC to XP1024
lvextend -m 1 lvname /dev/dsk/c15t8d0
that disk is a disk presented by the XP1024.
Understand that if this involves an oracle database or other write intensive application data, raid 5 can have a significant, negative impact on performance.
Oracle recommends data and redo by raid 1 or raid 10, not raid 5.
SEP
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тАО03-07-2005 03:43 AM
тАО03-07-2005 03:43 AM
Re: moving EMC to XP1024
What exactly you want o do here?? Copy data over from one storage to other??
Anil
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тАО03-07-2005 05:35 AM
тАО03-07-2005 05:35 AM
Re: moving EMC to XP1024
But remember, ability to mirror a LV using MirrorUX/DX also depeends on how the LV is actually setup.
if your LV is striped across the LUNS from the EMC RAID 1 AG, then you cannot mirror using MirrorUX-DX.
Find out how the LVs are setup now.
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тАО03-07-2005 06:27 AM
тАО03-07-2005 06:27 AM
Re: moving EMC to XP1024
when using pvmove it'll be lost - the copy process used by pvmove is very safe, even if one of the boxes fails this in itself won't cause any inconsistencies.
My experience would be that I'd go with pvmove, unless I have mirrordisk licences, in that case I'd definitely use mirror and lvsplit.
The crucial point for all lvm-mirroring is Your volume group parameters maxpv and maxpeperpv - if they don't leave space for the new disks, then there is little hope.
if there is only space for one pv left, pvmove is the best option.
If You have
emc_disk1
emc_disk2
emc_disk3
emc_disk4
emc_disk5
xp_disk1
then pvmove the data from emc_disk5 to xp_disk1 and vgreduce emc_disk5.
(btw: try to never end up with something
like
emc_disk1
emc_disk2
emc_disk4
emc_disk5 during the process with downlevel patches this might render disk4 and disk5 inaccessible.)
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тАО03-07-2005 07:12 AM
тАО03-07-2005 07:12 AM
Re: moving EMC to XP1024
thx for all ur reponses,
on emc: we mirror raid 1 at hardware level
on xp1024: we mirror raid 5 at hardware level and stripe at lvm level
i believe that u cant mix striping and lvm
mirroring unless extend based is used and we
dont use that