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тАО11-30-2004 05:34 PM
тАО11-30-2004 05:34 PM
max EVA disk fail
I'm curious to know what is the max number of concurrent physical disk(s) failure that EVA can tolerant.
Since RAID0 can hold zero failure, RAID1 - half failure, RAID 5 - one failure. What is about the VRAID1/5? That also means, what is the data store policy for EVA?
Thx.
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тАО11-30-2004 09:36 PM
тАО11-30-2004 09:36 PM
Re: max EVA disk fail
as it says in the following document :
http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel15-c.html
"The fault tolerance of these RAID levels is truly amazing; an eight-drive RAID 15 array can tolerate the failure of any three drives simultaneously"
Stf ;-)
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тАО12-01-2004 02:06 AM
тАО12-01-2004 02:06 AM
Re: max EVA disk fail
But judging from experience.. EVA's even if it has the word "Enterprise" on it - believe me, are not robust single array solutions compared to the EMC, the IBM Arrays or the Hitachi arrays (which HP OEM's as the XP series).
If you've deep pockets - keep another EVA handy and mirror accross the 2.
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тАО12-01-2004 01:21 PM
тАО12-01-2004 01:21 PM
Re: max EVA disk fail
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тАО12-01-2004 07:37 PM
тАО12-01-2004 07:37 PM
Re: max EVA disk fail
The EVA Array can only Raid1 or Raid5 for one LUN (not RAID15). Each LUN can have different Raid Levels using the same Disks (Virtuel Array)
Internaly the EVA groups the Disks in smaler Groups (RSS whith 8-12 Disks)In every one Group one Disk can fail at one Time.
To get realy high available Configurations you need an EVA 5000 whith min. 8 Shelfes.
When you then put your Disk evenly across all shelves the EVA 5000 can tolerate an hole shelf failure.
Hope this helps.
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тАО12-02-2004 01:51 AM
тАО12-02-2004 01:51 AM
Re: max EVA disk fail
I can send it to you.
Tell me if will be fine for you.
In the lab I do some test copying data.
while the system was copying data I pull out three disk in the disk group and the system continue working.
That is my experience but I said in the lab.
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тАО12-02-2004 12:00 PM
тАО12-02-2004 12:00 PM
Re: max EVA disk fail
To really answer your question, you have to look at the folowing:
Total number of disk groups.
How many disks per disk group.
Sparing level on each disk group.
Occupancy level for that disk group.
Basically because the EVA spreads the data for the entire disk group across all of the disks in that disk group. You can loose as many disks from that particular disk group as you have free space in that group. (assuming that you have enough time for leveling to occure between failures.)
IF you are at 90%+ occupancy level, you can only loose a few drives before you are at 100% occupancy. :-(