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тАО09-29-2009 07:03 AM
тАО09-29-2009 07:03 AM
We are at maximum capacity now and need to add drives and enclosures starting with FC drives. I have read several forums and articles regarding the ideal of тАЬverticalityтАЭ when distributing drives through enclosures and also the ideal of adding a minimum of 8 drives to the array. And others regarding adding at enclosures in pairs if possible.
It seems to me that the 3 ideals are not possible to achieve. i.e. add a minimum of 8 disks with 2 enclosures and maintain verticality with the existing distribution of FC and FATA. i.e. currently 24FC on left 24 FATA on right.
Can someone pls steer me in the right direction here?? Many thanks.
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тАО09-29-2009 08:47 AM
тАО09-29-2009 08:47 AM
SolutionWhy additions of the disks in 8
EVA Disk group (DG) is internaly organized in so called Redundant storage sets (RSS), that by default consist of 8 physical disks. Therefore one of the idea of verticality is to keep each RSS member in the separate disk enclosure.
Then in case of the enclosure failure, the DG continues to work and the production IO is running without the disruption.
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тАО10-09-2009 04:58 AM
тАО10-09-2009 04:58 AM
Re: EVA 4400 - Adding drives and enclosures best practice.
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тАО10-09-2009 05:15 AM
тАО10-09-2009 05:15 AM
Re: EVA 4400 - Adding drives and enclosures best practice.
The idea of 8 enclosures, disks spread on all them in columns, etc intends to provide grater failure protection, but you cannot be sure that the RSSs will be created as you expect. Adding drives to a disk group changes the RSS distribution, and not always in the way you think would be logical.
That can also change next time a disk fails, a RSS can merge with another and then split the resulting RSS.
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тАО10-09-2009 05:30 AM
тАО10-09-2009 05:30 AM