The linearstore relies on using libaio for its async disk writes. The
O_DIRECT flag is used, and this requires a block of aligned memory to
serve as a memory buffer for disk write operations. To my knowledge,
this technique only works with local disks and controllers. NFS does not
allow for DMA memory writes to disk AFAIK, and for as long as I can
remember, has been a problem for the linearstore. With some work it
might be possible to make it work using another write technique though.
NFS has never been a "supported" medium for linearstore.
On 11/9/18 4:28 PM, rammohan ganapavarapu wrote:
But how does NFS will cause this issue, i am interested to see because we
are using NFS (V4 version) in some environments, so wanted to learn tunings
when we use NFS.
Thanks,
Ram
On Fri, Nov 9, 2018 at 6:48 AM rammohan ganapavarapu <
rammohanga...@gmail.com> wrote:
Sorry, i thought it's NFS but it's actually SAN storage volume.
Thanks,
Ram
On Fri, Nov 9, 2018, 2:10 AM Gordon Sim <g...@redhat.com wrote:
On 08/11/18 16:56, rammohan ganapavarapu wrote:
I was wrong about the NFS for qpid journal files, looks like they are on
NFS, so does NFS cause this issue?
Yes, I believe it does. What version of NFS are you using?
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