Doug Utzig wrote:
> ASM does neither - its mirroring algorithm is unique. You can read
> about ASM redundancy here:
> http://www.oracle.com/technology/products/database/asm/pdf/asm_10gr2_bptwp_sept05.pdf
>
> Doug.
>
> Jagjeet Singh wrote:
>> Hi,
>>
>> I am trying to understand about ASM striping and mirroring mechanism.
>>
>> As It is confirm that I does both the things but I want to know whether
>> it does 1+0 or 0+1
>>
>> like First it does mirroring and then striping or striping and then
>> mirroring.
>>
>> Like If I create a normal redundancy diskgroup using
>>
>> create diskgroup dg normal redundancy
>> failgroup f1 disk 'disk1','disk2'
>> failgroup f2 disk 'disk3,disk4';
>>
>> And as per RAID 1+0
>>
>> DG
>> |
>> F1 --------------------------------------F2
>> | |
>> Disk1, Disk2 Disk3,Disk4
>>
>> And suppose 2 blocks [ b1 and b2 ] are occupied or get extended in
>> this diskgroup then would it be speeded like
>>
>>
>> DG
>> |
>> F1 ----------------------------------------- F2
>> | |
>> Disk1, Disk2 Disk3,Disk4
>>
>> b1 b1 b2 .b2
>>
>>
>> or
>>
>> DG
>> |
>> F1 ----------------------------------------- F2
>> | |
>> Disk1, Disk2 Disk3,Disk4
>>
>> b1 b2 b1 .b2
>>
>>
>> Regards,
>> Jagjeet Singh
>
Excellent. Thank you. Good to know for sure rather than just trying to
interpret less than clear statements.
--
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org
Received on Fri Dec 08 2006 - 10:04:48 CST
