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Compellent scv2020 Unallocated space
Hi,
I'm having a big space allocation problem with a Compellent Scv2020 storage pair. Initially I had 500GB read-intensive SSD drives on one and 2TB on the other. Given the need for more space, I added 9 7TB disks on the first and 8 on the second. The first is equipped with an additional enclosure so I currently have 25 500GB + 8 7TB + 1 2TB disks on the first storage and 15 2TB + 8 7TB disks on the second storage. The problem is that I have 39TB on the first storage and 54TB on the second storage of unallocated space, 51% on the first and 66% on the second. Unallocated space is mostly on 7TB disks. Storage 1: 38% consumed on 7TB disks, 100% on the single 2TB disk and 99.98% on 500GB disks. Storage 2: 18% consumed on 7TB disks and 73% on 2TB disks; one of the 7TB disks is at 0%.
Someone suggested that I start removing the smaller disks because their large number would prevent allocating space on the larger disks, I've tried that but it doesn't seem to work much.
I add that the storages are used by some datastores on vsphere 7.
I don't know how I could do it. Is anyone able to give me a solution?
Kind regards
innen
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June 18th, 2023 01:00
DellEMCSupport
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June 18th, 2023 21:00
Hello thanks for choosing Dell.
May we see your storage profile?
Also when did you add the disk?
innen
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June 19th, 2023 00:00
Hello,
I've added 7TB drives in two steps over the past few months.
innen
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June 19th, 2023 02:00
Forgive me, I did not understand which conversation I should read. I should add that I had availability problems a few days ago which I solved by inserting a new disk. So Unallocated space never becomes available, even when free space is used up.
Thanks
DellEMCSupport
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June 19th, 2023 02:00
Hello,
please check this conversation that explains how SC works with allocated and unallocated space. I don't think that unallocated space is a problem in your configuration.
Thanks
DellEMCSupport
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June 19th, 2023 02:00
Sorry, this one
Dell Compellent Free Space and Allocated Space - Dell Community
innen
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June 19th, 2023 07:00
HI,
I'm not sure I understood correctly. According to the article, the allocation takes place automatically taking into account various variables: type of raid, number of disks, storage profile, etc. But I experienced unavailability (Alert created on controller '250062' for object [internal ref: 'Read-Intensive SSD'] - [PercentFull]: Disk Folder Read-Intensive SSD has 7 percent or less space remaining available) despite the storage had 30TB of unallocated space, which I fixed by inserting a new disk. My problem is that the storages are unable to use this space as it is occupied by the servers. For example, 15K with raid 6/10 occupy the space at 100%: out of 7.86TB total, 5.18 are used and 2.68 free. While for read-Intensive-SSDs with RAID 5-9 the free space is always very little and when used it runs out.
What do you think I could do to be able to use this space?
Regards
DELL-Charles R
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June 19th, 2023 10:00
Hello innen,
I think these knowledge articles can help:
Storage Center Alert: Disk Folder < disk folder name > has < x > percent or less space remaining
https://dell.to/3NzhSkn
Understanding RAID with Dell SC Series Storage
https://dell.to/3NbyAoB