Pat,
No, not in general. It just seems that if one is storing data on an
SSD it should be optional to have it not stored in memory ( why store in
2 fast mediums ).
O_DIRECT is not of value as that would apply to all extents, whether on
SSD on HDD. O_DIRECT on Lustre has been problematic for me in the
past, performance wise.
John
On 5/19/22 13:05, Patrick Farrell wrote:
No, and I'm not sure I agree with you at first glance.
Is this just generally an idea that data stored on SSD should not be
in RAM? If so, there's no mechanism for that other than using direct I/O.
-Patrick
------------------------------------------------------------------------
*From:* lustre-discuss <[email protected]> on
behalf of John Bauer <[email protected]>
*Sent:* Thursday, May 19, 2022 12:48 PM
*To:* [email protected] <[email protected]>
*Subject:* [lustre-discuss] Avoiding system cache when using ssd pfl
extent
When using PFL, and using an SSD as the first extent, it seems it would
be advantageous to not have that extent's file data consume memory in
the client's system buffers. It would be similar to using O_DIRECT, but
on a per-extent basis. Is there a mechanism for that already?
Thanks,
John
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