m.2 drive support
techbank
6 Posts
March 1, 2017, 12:33 amQuote from techbank on March 1, 2017, 12:33 amHi,
Does PS support m.2 ssd's and can you use software raid with multiple m.2's?
Hi,
Does PS support m.2 ssd's and can you use software raid with multiple m.2's?
admin
2,930 Posts
March 1, 2017, 9:59 amQuote from admin on March 1, 2017, 9:59 amwe will be releasing an interim release 12.1 which will have upgraded kernel ( 3.12 -> 4.4 ) and enhanced drive detection supporting nvme drives. Current release does not. Release 12.1 will be in 2 weeks and will include support for multi-lang unicode in the ui.
Regarding RAID, you can use hardware RAID with PetaSAN but Ceph does not recommend using it for data redundancy. We do not support software RAID in PetaSAN, what is your requirement for software RAID , is it RAID0 ?
we will be releasing an interim release 12.1 which will have upgraded kernel ( 3.12 -> 4.4 ) and enhanced drive detection supporting nvme drives. Current release does not. Release 12.1 will be in 2 weeks and will include support for multi-lang unicode in the ui.
Regarding RAID, you can use hardware RAID with PetaSAN but Ceph does not recommend using it for data redundancy. We do not support software RAID in PetaSAN, what is your requirement for software RAID , is it RAID0 ?
techbank
6 Posts
March 1, 2017, 11:07 amQuote from techbank on March 1, 2017, 11:07 amwe want to use m.2 nvme ssd's and there aren't any (we could'nt find any) raid contollers that are 16x that can hold 4 m.2's. The bandwidth for samsung 951/961's on a 4x card will get maxed out with 2 drives let alone 4 so we thought software raid would be better so we can have ea. m.2 drive in its own 4x slot.
we want to use this server a shared resource for xen server HA/failover
What does ceph recommend for data redundancy?
we want to use m.2 nvme ssd's and there aren't any (we could'nt find any) raid contollers that are 16x that can hold 4 m.2's. The bandwidth for samsung 951/961's on a 4x card will get maxed out with 2 drives let alone 4 so we thought software raid would be better so we can have ea. m.2 drive in its own 4x slot.
we want to use this server a shared resource for xen server HA/failover
What does ceph recommend for data redundancy?
Last edited on March 1, 2017, 11:10 am · #3
admin
2,930 Posts
March 1, 2017, 12:05 pmQuote from admin on March 1, 2017, 12:05 pmCurrently we do not support software RAID. But it looks interesting, have you tried or tested a software RAID0 setup with nvme ? is the performance and cpu utilization good ? maybe it is something we can support in the future if it is a needed setup.
For redundancy, Ceph does not use common RAID, it stripes the block image into 4M objects, each object/stripe gets its 3 replicas saved on different set of drives. If you had 100 drives and one fails, its replacement will get 1/100 of each of the remaining drives thus not loading them during repair which is much better than RAID. Another big advantage is performance, your block image is saved on all physical drives, concurrent io is executed on all drives in parallel.
Currently we do not support software RAID. But it looks interesting, have you tried or tested a software RAID0 setup with nvme ? is the performance and cpu utilization good ? maybe it is something we can support in the future if it is a needed setup.
For redundancy, Ceph does not use common RAID, it stripes the block image into 4M objects, each object/stripe gets its 3 replicas saved on different set of drives. If you had 100 drives and one fails, its replacement will get 1/100 of each of the remaining drives thus not loading them during repair which is much better than RAID. Another big advantage is performance, your block image is saved on all physical drives, concurrent io is executed on all drives in parallel.
Last edited on March 1, 2017, 2:10 pm · #4
m.2 drive support
techbank
6 Posts
Quote from techbank on March 1, 2017, 12:33 amHi,
Does PS support m.2 ssd's and can you use software raid with multiple m.2's?
Hi,
Does PS support m.2 ssd's and can you use software raid with multiple m.2's?
admin
2,930 Posts
Quote from admin on March 1, 2017, 9:59 amwe will be releasing an interim release 12.1 which will have upgraded kernel ( 3.12 -> 4.4 ) and enhanced drive detection supporting nvme drives. Current release does not. Release 12.1 will be in 2 weeks and will include support for multi-lang unicode in the ui.
Regarding RAID, you can use hardware RAID with PetaSAN but Ceph does not recommend using it for data redundancy. We do not support software RAID in PetaSAN, what is your requirement for software RAID , is it RAID0 ?
we will be releasing an interim release 12.1 which will have upgraded kernel ( 3.12 -> 4.4 ) and enhanced drive detection supporting nvme drives. Current release does not. Release 12.1 will be in 2 weeks and will include support for multi-lang unicode in the ui.
Regarding RAID, you can use hardware RAID with PetaSAN but Ceph does not recommend using it for data redundancy. We do not support software RAID in PetaSAN, what is your requirement for software RAID , is it RAID0 ?
techbank
6 Posts
Quote from techbank on March 1, 2017, 11:07 amwe want to use m.2 nvme ssd's and there aren't any (we could'nt find any) raid contollers that are 16x that can hold 4 m.2's. The bandwidth for samsung 951/961's on a 4x card will get maxed out with 2 drives let alone 4 so we thought software raid would be better so we can have ea. m.2 drive in its own 4x slot.
we want to use this server a shared resource for xen server HA/failover
What does ceph recommend for data redundancy?
we want to use m.2 nvme ssd's and there aren't any (we could'nt find any) raid contollers that are 16x that can hold 4 m.2's. The bandwidth for samsung 951/961's on a 4x card will get maxed out with 2 drives let alone 4 so we thought software raid would be better so we can have ea. m.2 drive in its own 4x slot.
we want to use this server a shared resource for xen server HA/failover
What does ceph recommend for data redundancy?
admin
2,930 Posts
Quote from admin on March 1, 2017, 12:05 pmCurrently we do not support software RAID. But it looks interesting, have you tried or tested a software RAID0 setup with nvme ? is the performance and cpu utilization good ? maybe it is something we can support in the future if it is a needed setup.
For redundancy, Ceph does not use common RAID, it stripes the block image into 4M objects, each object/stripe gets its 3 replicas saved on different set of drives. If you had 100 drives and one fails, its replacement will get 1/100 of each of the remaining drives thus not loading them during repair which is much better than RAID. Another big advantage is performance, your block image is saved on all physical drives, concurrent io is executed on all drives in parallel.
Currently we do not support software RAID. But it looks interesting, have you tried or tested a software RAID0 setup with nvme ? is the performance and cpu utilization good ? maybe it is something we can support in the future if it is a needed setup.
For redundancy, Ceph does not use common RAID, it stripes the block image into 4M objects, each object/stripe gets its 3 replicas saved on different set of drives. If you had 100 drives and one fails, its replacement will get 1/100 of each of the remaining drives thus not loading them during repair which is much better than RAID. Another big advantage is performance, your block image is saved on all physical drives, concurrent io is executed on all drives in parallel.