Looking to test.
mark.mark
1 Post
April 15, 2026, 11:07 amQuote from mark.mark on April 15, 2026, 11:07 amHi all, I'm looking to test and muddle around with petasan and I have some questions.
- I have hardware, but not all of its available right this second. Can I run a 2 node cluster and add or even a single node and join others later? What are the downsides of doing this?
- I have a mixed drive setup, some are 4th, 10 tb, and a mix of 2/3 tb. Is that ok? Does ceph work like zfs in the sense you need similar drive capacity? Or should I sprinkle the drives over the nodes to create a more balanced mix of drives on each node? Also do I need to set a raid or are they all jbod on a single node?
Looking forward to playing with ceph and peta
Hi all, I'm looking to test and muddle around with petasan and I have some questions.
- I have hardware, but not all of its available right this second. Can I run a 2 node cluster and add or even a single node and join others later? What are the downsides of doing this?
- I have a mixed drive setup, some are 4th, 10 tb, and a mix of 2/3 tb. Is that ok? Does ceph work like zfs in the sense you need similar drive capacity? Or should I sprinkle the drives over the nodes to create a more balanced mix of drives on each node? Also do I need to set a raid or are they all jbod on a single node?
Looking forward to playing with ceph and peta
admin
3,073 Posts
April 23, 2026, 9:15 amQuote from admin on April 23, 2026, 9:15 amYou need to have at least 3 hosts minimum.
Different drive types/sizes are supported, they will be filled up with the same ratio. Even different host hardware is possible. But is always better to use comparable hardware and drives for performance reasons. The slowest drive types will become the performance bottleneck, slowing overall performance of cluster. Even if you using same drive make/model but different capacity, the drives with higher capacity will get higher i/o operations (due to keeping same fill ratio), so load will not be balanced between the drives and this will impact performance. The above is general rule of thumb, not specific to Ceph.
You need to have at least 3 hosts minimum.
Different drive types/sizes are supported, they will be filled up with the same ratio. Even different host hardware is possible. But is always better to use comparable hardware and drives for performance reasons. The slowest drive types will become the performance bottleneck, slowing overall performance of cluster. Even if you using same drive make/model but different capacity, the drives with higher capacity will get higher i/o operations (due to keeping same fill ratio), so load will not be balanced between the drives and this will impact performance. The above is general rule of thumb, not specific to Ceph.
Looking to test.
mark.mark
1 Post
Quote from mark.mark on April 15, 2026, 11:07 amHi all, I'm looking to test and muddle around with petasan and I have some questions.
- I have hardware, but not all of its available right this second. Can I run a 2 node cluster and add or even a single node and join others later? What are the downsides of doing this?
- I have a mixed drive setup, some are 4th, 10 tb, and a mix of 2/3 tb. Is that ok? Does ceph work like zfs in the sense you need similar drive capacity? Or should I sprinkle the drives over the nodes to create a more balanced mix of drives on each node? Also do I need to set a raid or are they all jbod on a single node?
Looking forward to playing with ceph and peta
Hi all, I'm looking to test and muddle around with petasan and I have some questions.
- I have hardware, but not all of its available right this second. Can I run a 2 node cluster and add or even a single node and join others later? What are the downsides of doing this?
- I have a mixed drive setup, some are 4th, 10 tb, and a mix of 2/3 tb. Is that ok? Does ceph work like zfs in the sense you need similar drive capacity? Or should I sprinkle the drives over the nodes to create a more balanced mix of drives on each node? Also do I need to set a raid or are they all jbod on a single node?
Looking forward to playing with ceph and peta
admin
3,073 Posts
Quote from admin on April 23, 2026, 9:15 amYou need to have at least 3 hosts minimum.
Different drive types/sizes are supported, they will be filled up with the same ratio. Even different host hardware is possible. But is always better to use comparable hardware and drives for performance reasons. The slowest drive types will become the performance bottleneck, slowing overall performance of cluster. Even if you using same drive make/model but different capacity, the drives with higher capacity will get higher i/o operations (due to keeping same fill ratio), so load will not be balanced between the drives and this will impact performance. The above is general rule of thumb, not specific to Ceph.
You need to have at least 3 hosts minimum.
Different drive types/sizes are supported, they will be filled up with the same ratio. Even different host hardware is possible. But is always better to use comparable hardware and drives for performance reasons. The slowest drive types will become the performance bottleneck, slowing overall performance of cluster. Even if you using same drive make/model but different capacity, the drives with higher capacity will get higher i/o operations (due to keeping same fill ratio), so load will not be balanced between the drives and this will impact performance. The above is general rule of thumb, not specific to Ceph.