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September 28th, 2007 11:00
RaidGroup Vs DiskGroup
Hi ,
Can we say Raidgroup in clariion is same as Diskgroup in symmetrix?.
If it is so, In Clariion we can have Physical disk which cannot be a part of Raid group. But if you want to create a LUN on Physical disk, Then we have to add that Physical disk to any RaidGroup and then only we can bind a LUN on it.
But My question is, We can have independent disks which cannot part of Raid group.
It is not the same case in Symmetrix if Raidgroup concept is equivalent to diskgroup in symmetrix and every disk should be part of Disk group in symmetrix.
So there cannot be a single disk which can be independent from the disk group in symmetrix which is not the case in clariion.
Regards
naren
Can we say Raidgroup in clariion is same as Diskgroup in symmetrix?.
If it is so, In Clariion we can have Physical disk which cannot be a part of Raid group. But if you want to create a LUN on Physical disk, Then we have to add that Physical disk to any RaidGroup and then only we can bind a LUN on it.
But My question is, We can have independent disks which cannot part of Raid group.
It is not the same case in Symmetrix if Raidgroup concept is equivalent to diskgroup in symmetrix and every disk should be part of Disk group in symmetrix.
So there cannot be a single disk which can be independent from the disk group in symmetrix which is not the case in clariion.
Regards
naren
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RRR
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October 24th, 2007 14:00
In a DMX you have RG's as well, but they are called devices. Each device can be made a lun when mapping it to an FA (or create a metadevice and map than bigger metadevice to an FA becoming a lun).
A DMX disk group is a logical range of fysical spindels (disks). While creating new devices you can use a disk group number to create these new devices on pre determined disks. You can hereby make sure certain fysical disks will be used or certain other disks aren't used.
A disk group is created by your CE and you can ask him to provide you with a list of device numbers and to which disk group they belong. Usually a disk group consists of the same type of disks, for example disk group 1 contains 48 146GB disks, DG 2 contains 32 300GB disks and so forth.
Symoptimizer used to work within disk groups only, but I think I've read somewhere that within 72 code sym optimization can also move data around between disk groups nowadays.
xe2sdc
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October 25th, 2007 05:00
devices. Each device can be made a lun when mapping
it to an FA (or create a metadevice and map than
bigger metadevice to an FA becoming a lun).
I think it's a little unclear if you talk about a "device" in the DMX .. are you talking about logical volumes (symdevs) or physical disks ?? It looks like you use "device" as "logical volume". But if you think to a RG, you can have more then a single LUN in every RG. This does not fit to a symdevice IMHO.
him to provide you with a list of device numbers and
to which disk group they belong. Usually a disk group
consists of the same type of disks, for example disk
group 1 contains 48 146GB disks, DG 2 contains 32
300GB disks and so forth.
A disk group will ALWAYS contain disks of the same type. Same speed, same capacity, same function in the backend.
but I think I've read somewhere that within 72 code
sym optimization can also move data around between
disk groups nowadays.
Yes if you want to dynamically move your data between different devices with different performances
xe2sdc
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October 29th, 2007 04:00
RRR
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October 29th, 2007 04:00
My device is indeed a logical device.
But when I look up a logical device in for example ECC and have a look in what RG this lg sits, the number is the same as the symdev number.
A Clariion RG indeed can have many luns, but a DMX I'm not sure off since this RG numbering is equal to the symdev numbering.
xe2sdc
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October 29th, 2007 07:00
I don't think it's in the properties of a symdev. How do you find the "RG" a symdev belongs to ??
RRR
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October 29th, 2007 07:00
in ECC, choose properties (yes, you do), on the left choose a symdev and voila: on your right, the "Raid group #" has now the same number as the number of your symdev.
A symdev show doesn't show this information though.
I must say that this is only visible with RAID5 symdev's. Mirrored symdev appear to have no raid group membership (or ECC has a glitch)
RRR
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October 29th, 2007 08:00
Clarrion: a RG is a bunch of spindels together from which you can form several luns
DMX: a RG is a slice from a few spindels, which form a logical device. On the same physical devices, more RG's can coexist.
RRR
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October 29th, 2007 08:00
xe2sdc
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October 29th, 2007 08:00
Clear and smooth.
Maybe you said it wrong .. or maybe I did not read carefully what you wrote
xe2sdc
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November 19th, 2007 23:00
Can we say Raidgroup in clariion is same as Diskgroup
in symmetrix?.
Naren first of all forgive me if we hijacked your original thread ..
Is there something else we can add to this thread ?? Did we answer your questions or do you have questions are still waiting to be answered ??
naren23-3_uew
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November 28th, 2007 10:00
xe2sdc
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November 29th, 2007 01:00
dynamox
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November 29th, 2007 03:00
RRR
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dynamox
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November 29th, 2007 07:00