Re: Storedge 3510 FC questions
From: Scott Howard (scott_at_hunterlink.net.au)
Date: 05/28/05
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Date: 28 May 2005 04:30:24 GMT
bridge_xue@yahoo.com wrote:
> 1. If I need to create some logical drives larger then 253G and some
> logical drive less then 253G. I understand that for 253G drive the head
> needs to be set to 64. But what about drives less then 253G? as this
> setting applies to all logical drives. So the drive less then 253G's
> head is also 64? does it matter?
No, it doesn't matter. The Sun recommended settings are heads=64,
cylinders<65536 and sectors variable, regardless of the size of the LUNs.
I believe these are the defaults if you're running the latest firmware
(4.11)
> 2. If there is a spare disk for logical drive, one disk failed, the
> spare disk will take over the failed one and rebuild the logical drive.
> Say after replacing the failed disk, will data be copied from the
> orginal spare disk to the replaced disk and the orginal spare disk
> becomes spare disk as it was before or the replaced disk will become
> spare one?
By default, nothing will happy. Nothing at all. You have 3 choices :
* Configure the array to automatically amke the replacement drive a hot
spare (I forget the exact option, but it's in there somewhere)
* Manually make the new drive a hot spare
* Manually do a "copy and replace" back to the original disk, and make the
original hot spare a hot spare again.
Personally I'd recommend one of the first two (I like option 2 myself).
The only time I'd recommend copying teh data back to the original disk if
if you've got some technical reason for doing it. eg, on an SE3310 you
might have your mirrors across the two SCSI buses, so it makes sense to
make sure it's like this afterwards. On the SE3510's (especially if you
dont have an expansion unit) there's zero reason to do it.
> 3. If there are no spare disks configured in any logical drive(no local
> spare, no global spare), then if one disk failed, after replace the
> failed disk, will the rebuilding of logical drive starts
> automatically? According to the documentation, it says user applies
No, it's a manual operation.
> forced drive rebuild, not sure what this means and also from the
> firmware interface, I couldn't find any manully force drive rebuild. I
>From memory you go to Logical Drives and select the LD which has lost the
disk and there will be a menu option there to rebuild the drive. This
option doesn't appear if there's no failed disks in the LD.
> 4. The documentation says that after a disk failed and replaced, need
> to restore the NVRAM configuration. Does that mean each time after
> replacing a failed disk, I need to restore the NVRAM configuration from
> disk? if yes, then why?
Hell no. You should only restore NVRAM settings after something has
gone badly wrong. I suspect the manual says you should _save_ the NVRAM
config to disk after replacing the disk. This is something that you should
do after most changes you do on the array to make sure that the "backup"
on the disks is correct.
If you are setting up a 3510, then I'd _strongly_ suggest upgrading to
the 4.11 firmware if the array hasnt' already got it.
Scott.
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