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August 17th, 2018 08:00
SC4020 unallocated physical disk space
Hi, further to a previous enquiry, I am trying to get a definitive answer to whether unallocated disk space is usable on the 7K HDD storage on a SC4020 SAN. Each disk is showing only 71.66% allocated and (6.47TB out of 9.03TB capacity). There is 2.56TB free space on each HDD (adding up to 51.26TB) which does not appear to be usable without reconfiguration. This can be seen in the attached screenshot. Any advice would be welcome.
Thanks
Richard W
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DELL-Bob Mi
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August 17th, 2018 14:00
The answer is yes, the system will automatically add space as it is needed. Your 2 spares do not count towards available space currently. Those are considered a non-active specifically for use if an active disk fails. so you have an actual 51.26 of available space. One change that will happen in SCOS07.03.xx when it is released is that all disks will become active.
One suggestion is not to look at space usage under the disk folder. I feel this does not always show the full picture. I would suggest to follow the steps on page 315 of the Dell Storage Manager 2016 R3 Administrator’s Guide:
For each storage type, the data progression pressure report displays how space is allocated, consumed, and scheduled to move across different RAID types and storage tiers. Use the data progression pressure report to make decisions about the types of disks to add to a Storage Center.
1. Select a Storage Center from the Storage view. (Data Collector connected Storage Manager Client only)
2. Click the Storage tab.
3. In the Storage tab navigation pane, expand Storage Type, then select the individual storage type that you want to examine.
4. Click the Pressure Report subtab to view the data progression pressure report. By default, the most recent data gathered from the Storage Center is displayed.
5. (Optional) To view a previously generated data progression report, select a report from the drop-down menu. Reports are identified by the date and time at which they were generated.
Disk Space Available - Total amount of disk space available on the disks of a Storage Center
Disk Space Allocated - Total amount of disk space allocated on the disks
Disk Allocated - Space reserved for volumes.
Disk Used - From the amount of space allocated, the amount that is in use by volumes.
Volume Allocated - Amount of space reserved for use by volumes after RAID is applied.
Volume Used - Amount of space used by volumes after RAID is applied.
I feel this can give you a better view of what is allocated, used, and available.
https://topics-cdn.dell.com/pdf/storage-sc2000_administrator-guide_en-us.pdf
ftp://customer:Y3V2s-uH@ftp.compellent.com/DOCUMENTS/680-017-026 DSM 2016 R3 Admin Guide.pdf
Please let me know if you have any further questions.