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тАО06-15-2010 04:08 PM
тАО06-15-2010 04:08 PM
Expand EVA4000 while at 99% occupancy
We have an EVA4000 with a disk group with 20 disks. The total raw capacity is 2459.9GiB, with 12GiB unallocated.
Most of the storage is allocated to two Vdisks ( 560GiB and 800Gib) used as VMWare Datastores
My questions:
- What risks do we have adding disk into the disk group at this level of occupancy?
- Is it recommended that we remove some VDisks to reduce the occupancy before we add additional disk into the "Disk Group"?
- What is the recommended occupancy level before we place the "Disk Group" at risk of failure?
Thanks and regards,
Marc
Most of the storage is allocated to two Vdisks ( 560GiB and 800Gib) used as VMWare Datastores
My questions:
- What risks do we have adding disk into the disk group at this level of occupancy?
- Is it recommended that we remove some VDisks to reduce the occupancy before we add additional disk into the "Disk Group"?
- What is the recommended occupancy level before we place the "Disk Group" at risk of failure?
Thanks and regards,
Marc
3 REPLIES 3
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тАО06-15-2010 10:56 PM
тАО06-15-2010 10:56 PM
Re: Expand EVA4000 while at 99% occupancy
Marc,
it's not a good idea to use more than 95% of raw space on EVA.
>- What risks do we have adding disk into the disk group at this level of occupancy?
If i understand you correctly, you want to add physical disk in the disk group - that's ok and shouldn't be a problem.
>- Is it recommended that we remove some VDisks to reduce the occupancy before we add additional disk into the "Disk Group"?
It's not necessary.
- What is the recommended occupancy level before we place the "Disk Group" at risk of failure?
95%
Your EVA is quite old, so i recommend you to check the controllers and disks firmware version and upgrade it to last one before you add disks.
it's not a good idea to use more than 95% of raw space on EVA.
>- What risks do we have adding disk into the disk group at this level of occupancy?
If i understand you correctly, you want to add physical disk in the disk group - that's ok and shouldn't be a problem.
>- Is it recommended that we remove some VDisks to reduce the occupancy before we add additional disk into the "Disk Group"?
It's not necessary.
- What is the recommended occupancy level before we place the "Disk Group" at risk of failure?
95%
Your EVA is quite old, so i recommend you to check the controllers and disks firmware version and upgrade it to last one before you add disks.
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тАО06-16-2010 01:07 AM
тАО06-16-2010 01:07 AM
Re: Expand EVA4000 while at 99% occupancy
Having disk space used is not going to make the disk group fail or cause data loss by itself. This is a RAID system after all.
Usually the disk group has "Disk drive failure protection" set to Single. This means that you really have the space equivalent to 2 disks free, but this space is reserved and not available to create vdisks.
If the disk group is to full you can face the following situations:
- A disk is having a lot of errors and interrupting the loops, but it not failed yet. You cannot ungroup and replace it because you have no space
- A disk fails, rebuild process is not started until you replace the disk because there's no spare space available.
- The disk group becomes inoperative because some disks reach 100% occupancy while rebuilding. In this case you have to delete or shrink vdisks to get out of it.
- Leveling cannot be done because there's no free space. In this situation you cannot add or remove disks. You must free some space.
Usually the disk group has "Disk drive failure protection" set to Single. This means that you really have the space equivalent to 2 disks free, but this space is reserved and not available to create vdisks.
If the disk group is to full you can face the following situations:
- A disk is having a lot of errors and interrupting the loops, but it not failed yet. You cannot ungroup and replace it because you have no space
- A disk fails, rebuild process is not started until you replace the disk because there's no spare space available.
- The disk group becomes inoperative because some disks reach 100% occupancy while rebuilding. In this case you have to delete or shrink vdisks to get out of it.
- Leveling cannot be done because there's no free space. In this situation you cannot add or remove disks. You must free some space.
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тАО06-24-2010 01:41 AM
тАО06-24-2010 01:41 AM
Re: Expand EVA4000 while at 99% occupancy
hi ,
You can add new disks one by one with one minute delay.
Wait for comamnd view detect the new disk and assign a logical disk name.
the final step is to group all disks in one action to have only one leveling.
it' s not necesaary to delete vdisk before this .
the only recommandation is to put the same disk size , and to verify the fw disk in ungroupped Disk Group.
Didier DANEL
You can add new disks one by one with one minute delay.
Wait for comamnd view detect the new disk and assign a logical disk name.
the final step is to group all disks in one action to have only one leveling.
it' s not necesaary to delete vdisk before this .
the only recommandation is to put the same disk size , and to verify the fw disk in ungroupped Disk Group.
Didier DANEL
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