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Fri, 6 Aug 2021 03:41:59 +0000 To: Damien Le Moal Cc: linux-block@vger.kernel.org, Jens Axboe , linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-ide@vger.kernel.org, Hannes Reinecke Subject: Re: [PATCH v3 0/4] Initial support for multi-actuator HDDs From: "Martin K. 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This capability is exposed to the host > using the Concurrent Positioning Ranges VPD page (SCSI) and Log (ATA). > Each positioning range describes the contiguous set of LBAs that an > actuator serves. I have to say that I prefer the multi-LUN model. > The first patch adds the block layer plumbing to expose concurrent > sector ranges of the device through sysfs as a sub-directory of the > device sysfs queue directory. So how do you envision this range reporting should work when putting DM/MD on top of a multi-actuator disk? And even without multi-actuator drives, how would you express concurrent ranges on a DM/MD device sitting on top of a several single-actuator devices? While I appreciate that it is easy to just export what the hardware reports in sysfs, I also think we should consider how filesystems would use that information. And how things would work outside of the simple fs-on-top-of-multi-actuator-drive case. -- Martin K. Petersen Oracle Linux Engineering