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Maybe I don't understand how it works

flitebynite

flitebynite

Well-known member
⭐️⭐️PATRON⭐️⭐️
I have a 3U K5000 Server with 6 x 1TB Drives.
Five are showing a solid blue light and the sixth has the flashing blue light.
Why do I only show 4TB's of usable space for content.
Shouldn't only one Drive be held as the hot spare and the rest be available for content making 5TB's usable?
Maybe I don't understand.
 
In a 3U, one drive is used to store parity information, and a second drive is a hot spare, so what you're seeing is normal.

In a 1U, one drive out of the four is used for parity. If any one of the four drives fails, the server continues to operate and no data is lost, but you are then operating in a "degraded" state where another drive failure will cause data loss. It's important to replace a failed drive in a 1U as soon as possible.

With the 3U, because there's a hot spare already in the chassis, the RAID can rebuild immediately when a drive fails. You are in a degraded state for only as long as it takes to rebuild onto the spare drive (roughly 1 day per TB of data that needs to be rebuilt). Once the rebuild finishes, you are then in a fully functional state where you could survive a second drive failure, but you will not have a hot spare until you replace the failed drive. When you do, the newly inserted drive will become the new hot spare.
 
View attachment 1030
MikeKobb said:
In a 3U, one drive is used to store parity information, and a second drive is a hot spare, so what you're seeing is normal.

In a 1U, one drive out of the four is used for parity. If any one of the four drives fails, the server continues to operate and no data is lost, but you are then operating in a "degraded" state where another drive failure will cause data loss. It's important to replace a failed drive in a 1U as soon as possible.

With the 3U, because there's a hot spare already in the chassis, the RAID can rebuild immediately when a drive fails. You are in a degraded state for only as long as it takes to rebuild onto the spare drive (roughly 1 day per TB of data that needs to be rebuilt). Once the rebuild finishes, you are then in a fully functional state where you could survive a second drive failure, but you will not have a hot spare until you replace the failed drive. When you do, the newly inserted drive will become the new hot spare.
Click to expand...
Thank you for the clear explanation.
 
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