[SPDK] Using SPDK & NVMe-oF with ZFS zvols
"Luis Navarro" <[email protected]> Thu, 15 Jun 2023 10:43:36 -0700
| Newsgroups | dev.linux.lists.spdk |
|---|---|
| Message-ID | <[email protected]> |
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I'm building an Ubuntu ZFS storage server that provides block storage for
ESXi VMs and a Windows 11 workstation.
Connectivity between the boxes is via 100G ConnectX-5 Ethernet cards.
The storage devices are a mix of enterprise-grade NVMe SSDs (fast tier) and
SATA HDDs (slow tier).
For the storage protocol, I was originally going to use iSCSI since that's
what I know. However, I started experimenting with RDMA and iSER and got
somewhat better performance and much lower CPU utilization. However, I
wasn't thrilled with the performance so a colleague directed me to look at
NVMe-oF. I've been experimenting with SPDK and NVMe-oF and, so far, the
performance is better than iSER in some areas and worse in others.
FWIW, I've been using AIO bdevs. I also tried uring bdevs but they were a
bit slower.
I have a few questions for the team:
1) I believe the ZFS zvols do not expose any of the details of any
underlying NVMe devices. In these cases, I've heard that NVMe-oF "falls
back" to simpler SCSI commands. Is this true?
2) If #1 is true, are there still benefits of using the NVMe-oF protocol
and/or SPDK's userspace implementation?
3) Are there any tips or tricks you can offer for maximizing performance
when using SPDK with ZFS zvols?
Thanks in advance!
Luis
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link=3D"#0563C1" vlink=3D"#954F72"><div class=3DWordSection1><p =
class=3DMsoNormal>I'm building an Ubuntu ZFS storage server that =
provides block storage for ESXi VMs and a Windows 11 =
workstation.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Connectivity between the boxes is via 100G ConnectX-5 =
Ethernet cards.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>The storage =
devices are a mix of enterprise-grade NVMe SSDs (fast tier) and SATA =
HDDs (slow tier).<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>For the =
storage protocol, I was originally going to use iSCSI since that's what =
I know. However, I started experimenting with RDMA and iSER and =
got somewhat better performance and much lower CPU utilization. =
However, I wasn't thrilled with the performance so a colleague directed =
me to look at NVMe-oF. I've been experimenting with SPDK and =
NVMe-oF and, so far, the performance is better than iSER in some areas =
and worse in others. <o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>FWIW, I've =
been using AIO bdevs. I also tried uring bdevs but they were a bit =
slower.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>I have a few questions for the team:<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>1) I believe =
the ZFS zvols do not expose any of the details of any underlying NVMe =
devices. In these cases, I've heard that NVMe-oF "falls =
back" to simpler SCSI commands. Is this =
true?<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>2) If #1 is true, are there still benefits of using =
the NVMe-oF protocol and/or SPDK's userspace =
implementation?<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>3) Are there =
any tips or tricks you can offer for maximizing performance when using =
SPDK with ZFS zvols?<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Thanks in =
advance!<o:p></o:p></p><p class=3DMsoNormal>Luis<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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