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From: Hannes Reinecke <hare@suse.de>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jens Axboe <axboe@fb.com>,
	linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	Damien Le Moal <damien.lemoal@hgst.com>
Subject: Re: [PATCH 4/6] block: Add 'zoned' sysfs queue attribute
Date: Sat, 23 Jul 2016 14:43:27 +0200	[thread overview]
Message-ID: <f39f2a46-75ab-a770-025f-6807c2f14413@suse.de> (raw)
In-Reply-To: <yq1wpkd9zbc.fsf@sermon.lab.mkp.net>

On 07/22/2016 10:45 PM, Martin K. Petersen wrote:
>>>>>> "Hannes" == Hannes Reinecke <hare@suse.de> writes:
> 
> Hannes> Add a sysfs queue attribute 'zoned' to display the zone layout
> Hannes> for zoned devices.
> 
> Not quite one value per file :(
> 
Yes.
But I wanted to display the zone layout in a concise way allowing
user-space programs to determine the zone layout without having to
issue a 'REPORT ZONES' command themselves.
I found it slightly pointless to add one sysfs entry per zone,
and at the same time a simple 'zone_size' attribute wouldn't cover all
possibilities.

However, as SMR drives seem to stabilise around having a fixed zone size
(with a possible exemption of the last zone to cover left-overs)
I'd be fine a replace this with a single 'zone_size' attribute which
could be set to eg '-1' for drives which indeed would implement variable
zone sizes.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N�rnberg
GF: J. Hawn, J. Guild, F. Imend�rffer, HRB 16746 (AG N�rnberg)

WARNING: multiple messages have this Message-ID (diff)
From: Hannes Reinecke <hare@suse.de>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jens Axboe <axboe@fb.com>,
	linux-block@vger.kernel.org, linux-scsi@vger.kernel.org,
	Damien Le Moal <damien.lemoal@hgst.com>
Subject: Re: [PATCH 4/6] block: Add 'zoned' sysfs queue attribute
Date: Sat, 23 Jul 2016 14:43:27 +0200	[thread overview]
Message-ID: <f39f2a46-75ab-a770-025f-6807c2f14413@suse.de> (raw)
In-Reply-To: <yq1wpkd9zbc.fsf@sermon.lab.mkp.net>

On 07/22/2016 10:45 PM, Martin K. Petersen wrote:
>>>>>> "Hannes" == Hannes Reinecke <hare@suse.de> writes:
> 
> Hannes> Add a sysfs queue attribute 'zoned' to display the zone layout
> Hannes> for zoned devices.
> 
> Not quite one value per file :(
> 
Yes.
But I wanted to display the zone layout in a concise way allowing
user-space programs to determine the zone layout without having to
issue a 'REPORT ZONES' command themselves.
I found it slightly pointless to add one sysfs entry per zone,
and at the same time a simple 'zone_size' attribute wouldn't cover all
possibilities.

However, as SMR drives seem to stabilise around having a fixed zone size
(with a possible exemption of the last zone to cover left-overs)
I'd be fine a replace this with a single 'zone_size' attribute which
could be set to eg '-1' for drives which indeed would implement variable
zone sizes.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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  reply	other threads:[~2016-07-23 12:43 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-19 13:20 [PATCH 0/6] Support for zoned block devices Hannes Reinecke
2016-07-19 13:20 ` [PATCH 1/6] blk-sysfs: Add 'chunk_sectors' to sysfs attributes Hannes Reinecke
2016-07-20  1:02   ` Damien Le Moal
2016-07-20  1:02     ` Damien Le Moal
2016-07-21  5:59   ` Christoph Hellwig
2016-07-22 20:35   ` Martin K. Petersen
2016-07-19 13:20 ` [PATCH 2/6] block: update chunk_sectors in blk_stack_limits() Hannes Reinecke
2016-07-20  1:05   ` Damien Le Moal
2016-07-20  1:05     ` Damien Le Moal
2016-07-21  5:59   ` Christoph Hellwig
2016-07-22 20:46   ` Martin K. Petersen
2016-07-19 13:20 ` [PATCH 3/6] block: Implement support for zoned block devices Hannes Reinecke
2016-07-20  1:05   ` Damien Le Moal
2016-07-20  1:05     ` Damien Le Moal
2016-07-19 13:20 ` [PATCH 4/6] block: Add 'zoned' sysfs queue attribute Hannes Reinecke
2016-07-20  1:07   ` Damien Le Moal
2016-07-20  1:07     ` Damien Le Moal
2016-07-22 20:45   ` Martin K. Petersen
2016-07-23 12:43     ` Hannes Reinecke [this message]
2016-07-23 12:43       ` Hannes Reinecke
2016-07-23 22:13       ` Bart Van Assche
2016-07-23 22:13         ` Bart Van Assche
2016-07-24  7:10         ` Hannes Reinecke
2016-07-24  7:10           ` Hannes Reinecke
2016-07-24 13:37           ` Bart Van Assche
2016-07-24 13:37             ` Bart Van Assche
2016-07-24 13:51             ` Bart Van Assche
2016-07-24 23:22               ` Damien Le Moal
2016-07-25  5:56               ` Hannes Reinecke
2016-07-25  5:56                 ` Hannes Reinecke
2016-07-25 14:45                 ` Jens Axboe
2016-07-24 23:16             ` Damien Le Moal
2016-07-25 14:44             ` Jens Axboe
2016-07-19 13:20 ` [PATCH 5/6] block: Introduce BLKPREP_DONE Hannes Reinecke
2016-07-20  1:10   ` Damien Le Moal
2016-07-20  1:10     ` Damien Le Moal
2016-07-21  5:58   ` Christoph Hellwig
2016-07-21  6:01     ` Hannes Reinecke
2016-07-21  6:01       ` Hannes Reinecke
2016-07-19 13:20 ` [PATCH 6/6] block: Add 'BLK_MQ_RQ_QUEUE_DONE' return value Hannes Reinecke
2016-07-20  1:11   ` Damien Le Moal
2016-07-20  1:11     ` Damien Le Moal
2016-07-21  5:53   ` Christoph Hellwig
2016-07-21  6:00     ` Hannes Reinecke
2016-07-21  6:00       ` Hannes Reinecke

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