* [SPDK] Re: PMEM over RDMA (RPMEM) Support Status in SPDK
@ 2020-03-02 23:03 Harris, James R
0 siblings, 0 replies; 2+ messages in thread
From: Harris, James R @ 2020-03-02 23:03 UTC (permalink / raw)
To: spdk
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Hi Joe,
There are a few ways to access persistent memory over RDMA:
1) The bdev module that Paul referenced - see module/bdev/pmem. This case uses PMDK to create a libpmemblk pool, creates a bdev from it, which can then be exposed over RDMA using the NVMe-oF target
2) PMDK's librpmem - this provides a mechanism to remotely replicate a PMDK memory region over the RDMA protocol - you can find more details on pmem.io
3) Provision a devdax namespace and register it for RDMA access directly (note: you'll still need something on the target side to ensure data is properly flushed to the persistence domain)
If you're interested in #2 or #3, you may want to check out the pmem mailing list on Google Groups.
-Jim
On 3/2/20, 3:44 PM, "Luse, Paul E" <paul.e.luse(a)intel.com> wrote:
Hi Joe,
I can give you a little on PMEM in general, will let someone else jump in with any NVMeoF stuff... Today SPDK uses PMDK to support PMEM in two major ways:
- we can expose a pmem region as a bdev through the block device module for pmem
- our compression bdev uses pmem behind the scenes to track metadata for compressed data stored on other media
Thx
Paul
On 3/2/20, 3:28 PM, "Gruher, Joseph R" <joseph.r.gruher(a)intel.com> wrote:
I'm just curious about the support for PMEM over RDMA Ethernet in SPDK. I assume it will be similar functionally to NVMe/NVMeoF, but for PMEM... eventually.
I was wondering if you can point me to a website, whitepaper, or person where I could get a general sense of SPDK support for PMEM, both implemented as of today, and future roadmap/schedule.
I'd love to test it out in my lab when it is mature enough for that to be a reasonable thing to attempt, as I am fairly well equipped with RDMA capable NICs and with PMEM equipped systems, and experienced with using SPDK with NVMe/NVMeoF, but I'd like to wait until it is reasonably mature, so trying to get a sense of where we are today, and when might be a reasonable target date to try and engage with some basic testing / proof-of-concept type work.
Thanks,
Joe Gruher
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^ permalink raw reply [flat|nested] 2+ messages in thread
* [SPDK] Re: PMEM over RDMA (RPMEM) Support Status in SPDK
@ 2020-03-02 22:44 Luse, Paul E
0 siblings, 0 replies; 2+ messages in thread
From: Luse, Paul E @ 2020-03-02 22:44 UTC (permalink / raw)
To: spdk
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Hi Joe,
I can give you a little on PMEM in general, will let someone else jump in with any NVMeoF stuff... Today SPDK uses PMDK to support PMEM in two major ways:
- we can expose a pmem region as a bdev through the block device module for pmem
- our compression bdev uses pmem behind the scenes to track metadata for compressed data stored on other media
Thx
Paul
On 3/2/20, 3:28 PM, "Gruher, Joseph R" <joseph.r.gruher(a)intel.com> wrote:
I'm just curious about the support for PMEM over RDMA Ethernet in SPDK. I assume it will be similar functionally to NVMe/NVMeoF, but for PMEM... eventually.
I was wondering if you can point me to a website, whitepaper, or person where I could get a general sense of SPDK support for PMEM, both implemented as of today, and future roadmap/schedule.
I'd love to test it out in my lab when it is mature enough for that to be a reasonable thing to attempt, as I am fairly well equipped with RDMA capable NICs and with PMEM equipped systems, and experienced with using SPDK with NVMe/NVMeoF, but I'd like to wait until it is reasonably mature, so trying to get a sense of where we are today, and when might be a reasonable target date to try and engage with some basic testing / proof-of-concept type work.
Thanks,
Joe Gruher
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SPDK mailing list -- spdk(a)lists.01.org
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2020-03-02 22:44 Luse, Paul E
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