From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Roman Mamedov <rm@romanrm.net>
Cc: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>,
Logan Gunthorpe <logang@deltatee.com>,
linux-raid@vger.kernel.org, Jes Sorensen <jes@trained-monkey.org>,
Guoqing Jiang <guoqing.jiang@linux.dev>, Xiao Ni <xni@redhat.com>,
Coly Li <colyli@suse.de>,
Chaitanya Kulkarni <chaitanyak@nvidia.com>,
Jonmichael Hands <jm@chia.net>,
Stephen Bates <sbates@raithlin.com>,
Martin Oliveira <Martin.Oliveira@eideticom.com>,
David Sloan <David.Sloan@eideticom.com>
Subject: Re: [PATCH mdadm v2 1/2] mdadm: Add --discard option for Create
Date: Mon, 12 Sep 2022 13:43:33 -0400 [thread overview]
Message-ID: <yq1a674bie5.fsf@ca-mkp.ca.oracle.com> (raw)
In-Reply-To: <20220909165417.4161b5a8@nvm> (Roman Mamedov's message of "Fri, 9 Sep 2022 16:54:17 +0500")
Roman,
> In the ATA layer there is the sysfs file "discard_zeroes_data", which
> tells whether or not to expect zeroes after a discard. That flag does
> not appear to be always correct, e.g. I have some SSDs which do
> observably read back zeroes after a discard, but the flag still says
> "0".
It is hardwired to "0" for backwards compatibility. We don't support
discards for clearing block ranges anymore. There is an explicit zeroing
operation for that use case.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2022-09-12 17:44 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 23:08 [PATCH mdadm v2 0/2] Discard Option for Creating Arrays Logan Gunthorpe
2022-09-08 23:08 ` [PATCH mdadm v2 1/2] mdadm: Add --discard option for Create Logan Gunthorpe
2022-09-09 9:57 ` Mariusz Tkaczyk
2022-09-09 11:54 ` Roman Mamedov
[not found] ` <CABdXBANrJNWjq4237k9DPRoxLVmiAUoKMZxaaLUrcMHsODwvmA@mail.gmail.com>
2022-09-09 15:31 ` Roman Mamedov
2022-09-12 17:43 ` Martin K. Petersen [this message]
2022-09-09 15:47 ` Logan Gunthorpe
2022-09-13 7:35 ` Mariusz Tkaczyk
2022-09-13 15:43 ` Logan Gunthorpe
2022-09-14 12:01 ` Mariusz Tkaczyk
2022-09-14 16:29 ` Logan Gunthorpe
2022-09-14 17:39 ` Mariusz Tkaczyk
2022-09-19 8:41 ` Xiao Ni
2022-09-21 18:45 ` Logan Gunthorpe
2022-09-08 23:08 ` [PATCH mdadm v2 2/2] manpage: Add --discard option to manpage Logan Gunthorpe
2022-09-12 17:40 ` [PATCH mdadm v2 0/2] Discard Option for Creating Arrays Martin K. Petersen
[not found] ` <CABdXBAP0LeQMmhSLUMZ_TmnSp5xmZ4xJBkNa7HUm7094m_x9xA@mail.gmail.com>
2022-09-13 3:47 ` Martin K. Petersen
2022-09-13 15:38 ` Logan Gunthorpe
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