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12 Posts
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644
October 8th, 2010 02:00
Delete a symm from symapidb without rebuilding db
Hi Friends,
Have a couple of queries wrt DMX.
1. Can we selectively remove entries of a particluar symm from symapidb on the management host ?
Consider that a frame has been decommed and I need that frame to removed from the symapidb of the management host. I would like to do this without rebuilding the db !
2. Can a Raid Group spread across more than one Disk Group ?
Example, Diskgroup_0 has a few disks and Diskgroup_1 has few more disks of the same type. Can my RG spread cross both these DiskGroups? If yes, any possible issues ?
Thanks!
Mahen.
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dynamox
9 Legend
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20.4K Posts
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October 10th, 2010 20:00
take a look at this thread
https://community.emc.com/message/399323
we use different disk groups for different type of drives, for example we have one disk group for LCFC (500G drives), another group for FC (300G). Another use for disk groups is if you want to isolate workload for one application, for example we have a dedicated disk group for Exchange because of how sensitive it is to io requirements. Don't get too disk group happy or you will create a bunch of little island and not optical backend utilization. Disk groups are created by CE's. Some CEs like to create a brand new disk group when they add disk, we ask them not to do that ..but to add disks to existing groups as longs as the disk type matches. In my shop we don't "precreate" every single symdev (some shops do that), so when i create new devices i want them to span as many physical drives as possible.
dynamox
9 Legend
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20.4K Posts
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October 8th, 2010 03:00
1) symcfg remove -sid 00000001234567
2) you can't control RG, but when you build symdevs you can specify what disk group you want to build them from. If you don't specify the disk group option, SymmWin will place the hypers that comprise your symdev on any available disk.
MahendranVijay
12 Posts
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October 10th, 2010 19:00
Thanks dynamox!
1 - awesome simple single command!
I was not knowing that this command existed. I was wondering on how to work on this at the db level ! i just complicated it myslef :-(
Lesson learnt for me - should always remember, there are always simpler way to do things!
2 - So you mean, if I do not sepcify any disk group in my `create dev` command file, SymmWin is going to place my devs across several Disk Groups containing same type of disks....?
So, in a Symm, there is no concept of several RGs for a single Raid type and also we cannot create RGs manually selecting the disks?
For example all Raid-5 devs created in the symm will be in a single Raid-5 RG which can be controlled by the symm alone ?
Then may I ask you for better understanding, what is the main purpose of having a disk group, just for management purpose ?
Thanks!
Mahen.
MahendranVijay
12 Posts
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October 10th, 2010 20:00
Got it! Thanks a lot!
-Mahen.