[SPDK] Re: Unable to run OCF bdev, bdev not attached

>
>
> What kind of workloads from FIO?


4KB sequential write or randwrite


> And what's the capacity of the NVMe SSD as Cache device for the Core
> device (HDD).
>

7TB SSD, 3.7TB HDD, 64KB OCF cache line


>
> Are you using the OCF bdev for the FIO?
>

No I'm not, the FIO command was directly run on /dev/sdk1. I suppose it's a
aio bdev so I can read/write it directly with the OS?


>
> If there is detailed configuration of FIO and OCF Bdev, that will be
> helpful.
>
> Thanks,
> Gang
>
> -----Original Message-----
> From: Bob Chen <a175818323(a)gmail.com>
> Sent: Friday, August 28, 2020 15:20
> To: Storage Performance Development Kit <spdk(a)lists.01.org>
> Subject: [SPDK] Re: Unable to run OCF bdev, bdev not attached
>
> Hi, folks
>
> I solved this issue by myself. It's because the latest SPDK needs 2MB
> hugepages while the spdk_tgt app applies 1GB by default.
>
> Then I began to run some fio commands on the core device (/dev/sdk1), but
> surprisingly found that there was NO performance improvement at all.
>
> Using SPDK + OCF to accelerate a HDD by an NVMe SSD, is this a correct
> scenario?
>
> <a175818323(a)gmail.com> 于2020年8月27日周四 下午5:58写道：
>
> > ./rpc.py bdev_nvme_attach_controller -b Nvme0 -t PCIe -a 0000:3b:00.0
> > ./rpc.py bdev_aio_create /dev/sdk1 Aio0 512 ./rpc.py bdev_ocf_create
> > Cache0 wb Nvme0n1 Aio0 --cache-line-size 64
> >
> >
> > Inserting cache Cache0
> > Cache0: Metadata initialized
> > Cache0: Successfully added
> > Cache0: Cache mode : wb
> > Cache0: Attaching cache device failed
> > vbdev_ocf.c:1016:start_cache_cmpl: *ERROR*: Error -1000013 during
> > start cache Cache0, starting rollback
> > Cache0: Cannot flush cache - cache device is detached
> > Cache0: Cache Cache0 successfully stopped
> >
> >
> > Looks like the cache/core device is not attached, what else should I
> > do to make it work?
> >
> > P.S. I have run Open-CAS-Linux successfully on this machine, so the
> > cas_cache and cas_cache ko are currently loaded. casctl and casadm
> > tools exist as well.
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