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тАО10-15-2003 01:49 AM
тАО10-15-2003 01:49 AM
Usable capacity on EVA5000
Situation is:
32* 73 GB drives
2 Vraid pools
Highest level Hot Sparing
If it makes any difference, snap vill be used in both pools.
Thanks in advance
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тАО10-15-2003 03:36 AM
тАО10-15-2003 03:36 AM
Re: Usable capacity on EVA5000
([number of drives in RAID group] -1) * [size of drives] - ([number of drives used for hot-spares] * [size of drives] = [capacity of RAID group]
HTH
-Josh
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тАО10-15-2003 03:42 AM
тАО10-15-2003 03:42 AM
Re: Usable capacity on EVA5000
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тАО10-15-2003 05:40 PM
тАО10-15-2003 05:40 PM
Re: Usable capacity on EVA5000
we have a EVA installed with 64*73GB disks, and we have a usable space of 3.2 TB in Raid 5. We have a single disk failure protection. So here is how I calculate usable space. if you have 32 disks, and 2 diskgroups with double protection, you loose 8 disks, 4 on every diskgroup. the raid 5 is a virtual one, but you loose around 20-25% for parrity. so in you' re case, you will probably have a usable space of ((32-8)*73GB)*75% = 1.3 TB
Rgds,
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тАО10-15-2003 10:32 PM
тАО10-15-2003 10:32 PM
Re: Usable capacity on EVA5000
This seems to match my reality qiute well.
Do you, by any chance, know if any official formula or tool exists to do this calculation for various scenarioes ??
rgds
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тАО10-15-2003 10:58 PM
тАО10-15-2003 10:58 PM
Re: Usable capacity on EVA5000
i know there is a tools to calculate the usable space, but i never had it. you should ask a sales guy from HP , because they work a lot with this tool.
Rgds,
Claudiu
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тАО11-22-2004 07:36 AM
тАО11-22-2004 07:36 AM