From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: Kernel option to disable TRIM/discard system-wide?
Date: Tue, 31 May 2016 23:05:41 -0400
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In-Reply-To: <574B17EB.50108@rabbit.us> (Peter Rabbitson's message of "Sun, 29
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Cc: "Martin K. Petersen" <martin.petersen@oracle.com>, linux-ide@vger.kernel.org

>>>>> "Peter" == Peter Rabbitson <rabbit+list@rabbit.us> writes:

Peter> root@Ahasver:~# echo 0 > /sys/block/sda/queue/discard_max_bytes
Peter> -bash: /sys/block/sda/queue/discard_max_bytes: Permission denied

Peter> What am I missing?

Your kernel is too old. Try:

echo -n disabled > /sys/block/sda/device/scsi_disk/*/provisioning_mode

-- 
Martin K. Petersen	Oracle Linux Engineering