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August 22nd, 2010 22:00
what is the "Permanent Sparing" function?
Dear All,
I found the document and mentioned about "Permanent Sparing".
It can improve reliability by only copying data 'one way'.
Why it mention 'one way"?
What's different between normal spare and permanent spare?
Thank you for any input.
Dennis Dai
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Amita2
93 Posts
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August 23rd, 2010 07:00
Dennis,
I am sorry .There is some problem with font in the above message.I am reposting it as there is no option to delete.
Spare drives are configured to provide additional protection in the event of a drive failures.There are basically two types of Sparing :
1) Dynamic Sparing (Hot Spare)
2) Permanent Sparing
1) Dynamic Sparing : Its is a Temopary replacement .
Dynamic spare is invoked against faulty drive and takes up the available mirror position.
Data is then copied to the Hot spare(Dynamic spare) and bad drive is made NR.
When bad drive is replaced, data is copied back to new drive.
Hot spare is released and is ready to be used again.
2) Permanent Sparing :
Data is copied to the spare and Configuration changes are made to change the spare name to the failed volume name.
When bad drive is replaced, it becomes part of the spare pool.
Regards
Amita
dynamox
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August 22nd, 2010 22:00
Dennis,
take a look at this paper
https://powerlink.emc.com/nsepn/webapps/btg548664833igtcuup4826/km/live1//en_US/Offering_Technical/White_Paper/H5533-drive-sparing-emc-symmetrix-dmx-3-dmx-4-systms-wp.pdf
sarpydog
2 Intern
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360 Posts
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August 23rd, 2010 18:00
Hi Amita,
Thanks a lot for clear explanation.
Best Regards,
Dennis Dai
miky2
1 Rookie
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July 13th, 2015 04:00
what about this?
A permanent sparing operation is underway
Ugin
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122 Posts
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July 13th, 2015 05:00
The Sparing operation is going on - means the data is being copied to the spare drive