admingirl
3 Silver

Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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hello

I have been asked by the DW team if their symm devices created on the dmx-3 share spindles with non data ware house devices. My first inclination is to say no because I am relatively a dmx-3 newbie, however I want to be sure. I know that sharing spindles on the clariion is common if I create luns within the same raid group for different applications and I can check that easily on our CX4-480. Finding this information on the dmx-3 is a mystery to me. I display the disks by disk group, I execute a symdisk list to see the free space on each disk, however, I can't tell how many devices(luns), have data on each disk. If other servers have data defined on the disks used by the DW, then I might to do some shuffling. The devices are standard devices, no bcvs.

Sorry if the answer is obvious, I am just not finding the answers needed.

Thanks!

Admingirl

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dynamox
6 Gallium

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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unless your DW application was provisioned from a dedicated disk group, their devices are on "shared" spindles. If you run "symdev show -sid 123 DEVNAME", at the bottom of the output you will see the physical drives where each hyper reside.  For example here is a 8.6G device (not meta), it's raid-5 device (3+1 configuration)

RAID-5 Hyper Devices (3+1):
            {
            Device : 1053
                {
                --------------------------------------------------------------
                 Disk     DA       Hyper       Member    Spare       Disk
                DA :IT   Vol#   Num Cap(MB)  Num Status  Status  Grp#  Cap(MB)
                --------------------------------------------------------------
                02D:Db   3468    37    2878    1 RW      N/A        0   286102
                01C:Db   3444    39    2878    2 RW      N/A        0   286102
                15C:Db   3456    39    2878    3 RW      N/A        0   286102
                16D:Db   3454    37    2878    4 RW      N/A        0   286102
                }
            }
        }

now you could run "symdisk show -sid 123 2D:DB" and see all the symmetrix devices that reside on that physical drive. Repeat for the rest of the drives.

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5 Replies
dynamox
6 Gallium

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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unless your DW application was provisioned from a dedicated disk group, their devices are on "shared" spindles. If you run "symdev show -sid 123 DEVNAME", at the bottom of the output you will see the physical drives where each hyper reside.  For example here is a 8.6G device (not meta), it's raid-5 device (3+1 configuration)

RAID-5 Hyper Devices (3+1):
            {
            Device : 1053
                {
                --------------------------------------------------------------
                 Disk     DA       Hyper       Member    Spare       Disk
                DA :IT   Vol#   Num Cap(MB)  Num Status  Status  Grp#  Cap(MB)
                --------------------------------------------------------------
                02D:Db   3468    37    2878    1 RW      N/A        0   286102
                01C:Db   3444    39    2878    2 RW      N/A        0   286102
                15C:Db   3456    39    2878    3 RW      N/A        0   286102
                16D:Db   3454    37    2878    4 RW      N/A        0   286102
                }
            }
        }

now you could run "symdisk show -sid 123 2D:DB" and see all the symmetrix devices that reside on that physical drive. Repeat for the rest of the drives.

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vijay861
1 Nickel

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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Hi

Does VMAX also follows the same architecture?

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Quincy561
3 Zinc

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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VMAX and DMX both allow mixing of RAID types on a physical disk, and also don't have a concept of a RAID group when creating a LUN like CX/VNX.

John

yaribhas
2 Iron

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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There are ways to find that out using ECC also.

It has been a while but i think if you go to relationship's view you can find that information.

admingirl
3 Silver

Re: Do Meta/hyper devices created on dmx-3 "share spindles" with other devices

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Thank you,

I can see the relationships now.

Admingirl

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