topic Re: add disk enclosure eva6000 high occupancy level in Disk Enclosures

add disk enclosure eva6000 high occupancy level

ilayy — Fri, 05 Nov 2010 17:45:18 GMT

hi experts
i have eva6000 on which i have a disk group with the following description 20 disks
protection level: single
capacity: 8380,29 GB
used:8317.34GB
which means the occupancy is about 99%

i need to add a disk enclosure then add disks to this disk group.my questions are

1)is that possible? as the occupancy is 99%? is it risky?
2)the unused space and the disks used in the protection level are used to calculate the leveling or just in case of disk loss it is used to rebuild the data on it?

Re: add disk enclosure eva6000 high occupancy level

Jan Soska — Sun, 07 Nov 2010 21:55:58 GMT

Hello,
ad 1) - no problem, just do it until you really get out of space...
ad 2) - I think it is reserved space in case of disk failure for rebuilding the data. (single - 1 disk failure, double - 2 disk failure)

Jan

Re: add disk enclosure eva6000 high occupancy level

ilayy — Sun, 07 Nov 2010 22:37:48 GMT

hi again
what do you mean do it until you get out of space. please clarify and should i add all the disks together or first i have to add only 2 disks and wait till the leveling is finish then adding all the others?

Re: add disk enclosure eva6000 high occupancy level

Jan Soska — Mon, 08 Nov 2010 08:31:13 GMT

Hello, whe adding disk you have 2 options:
1) fast one - put all drives you want to add into EVA, then click on vgroup you want to extend, click add disk, enter number of them, click ok.
2) slower one - you choose particular disk and move him into target vgroup.

Jan

Re: add disk enclosure eva6000 high occupancy level

Rob Leadbeater — Mon, 08 Nov 2010 10:06:39 GMT

Hi,

What are the sizes of the disks in the group that you're looking to expand ?

The sparing level reserves two times the size of the largest disk in the group, so if you were to add one or two 300GB disks to a group that currently has 72GB disks, you could end up with less available storage...

Regards,

Rob

Re: add disk enclosure eva6000 high occupancy level

ilayy — Mon, 08 Nov 2010 12:01:11 GMT

hi
don't you think that your answers are so far from my questions?
i am asking if it is a risk to add more disks to a disk group when i have occupancy level of 99%

Re: add disk enclosure eva6000 high occupancy level

Jan Soska — Mon, 08 Nov 2010 12:43:15 GMT

No, risk is only you will run out of space for production system.

Re: add disk enclosure eva6000 high occupancy level

Rob Leadbeater — Mon, 08 Nov 2010 12:59:52 GMT

> i am asking if it is a risk to add more
> disks to a disk group when i have
> occupancy level of 99%

Yes, there is a potential risk if you add a small number of big disks into a disk group with smaller disks.

Hence why I asked how many disks and what sizes are in the current group.

However, looking back at your original information it would appear that you could have 500GB FATA disks in the group, so you should be fine, as these are the biggest available for the EVA6000 (I think).

Cheers,

Rob

Re: add disk enclosure eva6000 high occupancy level

ilayy — Thu, 18 Nov 2010 20:47:38 GMT

hi all
-i have removed the protection level which was single and i set it to non so i have the size of 2 disks free = 1 TB
-and i have added in the same time 2 disks to another disk group where i have enough free space the leveling on this disk group is 57% and in progress the leveling on the first one it is 22% and pending
so what is the problem?

Re: add disk enclosure eva6000 high occupancy level

Rob Leadbeater — Fri, 19 Nov 2010 08:46:39 GMT

Probably nothing. The EVA (I think) only does one levelling operation at a time, so the pending one will resume, when the other has completed.

Regards,
Rob

Re: add disk enclosure eva6000 high occupancy level

ilayy — Fri, 19 Nov 2010 13:04:45 GMT

if the eva do one leveling at a time how it reaches 22%?