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тАО06-18-2009 02:06 AM
тАО06-18-2009 02:06 AM
EVA8000 with Vraid5 and Double Protection
Hi I wonder if someone can assist me I have a EVA8000 with 138 Disks in a Disk Group Configured on VRAID5 with Double Protection How will RSS Protect me and up to how many Disks will i be able to lose before being put into risk of Loosing Data
3 REPLIES 3
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тАО06-18-2009 02:16 AM
тАО06-18-2009 02:16 AM
Re: EVA8000 with Vraid5 and Double Protection
Short answer: ONE
If two disks fail at the same time, without time to rebuild the RAID between one failure and the other, then it depends on which disks fail.
The 138 disks will likiley form 17 RSS, you can lose one disk from each RSS without losing data.
The "disk failure protection" does not provide any extra protection against **simultaneous** disk failures. It's mission is to reserve space to be able to rebuild as fast as possible once a disk fails. So the disk group is back to full redundancy as soon as possible.
After the RAID has finished rebuilding, you can lose another disk. But if a disk fails before that, it depends on which disk. You could lose the RAID 5 or the RAID 5 and RAID 1, depending on which disks fail.
If two disks fail at the same time, without time to rebuild the RAID between one failure and the other, then it depends on which disks fail.
The 138 disks will likiley form 17 RSS, you can lose one disk from each RSS without losing data.
The "disk failure protection" does not provide any extra protection against **simultaneous** disk failures. It's mission is to reserve space to be able to rebuild as fast as possible once a disk fails. So the disk group is back to full redundancy as soon as possible.
After the RAID has finished rebuilding, you can lose another disk. But if a disk fails before that, it depends on which disk. You could lose the RAID 5 or the RAID 5 and RAID 1, depending on which disks fail.
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тАО06-18-2009 04:58 AM
тАО06-18-2009 04:58 AM
Re: EVA8000 with Vraid5 and Double Protection
And despite the "Redundant" in RSS - it DOES NOT protect your data.
The protection (=redundancy) is provided by the VRAID-level.
Create a VRAID-0 virtual disk and you have ***NO*** protection against data loss from a disk drive failure -- no matter how many RSSes a disk group has and how high you set the so-called "protection level".
The protection (=redundancy) is provided by the VRAID-level.
Create a VRAID-0 virtual disk and you have ***NO*** protection against data loss from a disk drive failure -- no matter how many RSSes a disk group has and how high you set the so-called "protection level".
.
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тАО06-22-2009 12:07 AM
тАО06-22-2009 12:07 AM
Re: EVA8000 with Vraid5 and Double Protection
Thx for your help Guys much apreciated!!!
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