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From: Brendan Conoboy <blc@redhat.com>
To: Roberto Spadim <roberto@spadim.com.br>
Cc: "Mathias Burén" <mathias.buren@gmail.com>,
	"Phillip Susi" <psusi@cfl.rr.com>,
	"David Brown" <david@westcontrol.com>,
	linux-raid@vger.kernel.org
Subject: Re: SSD - TRIM command
Date: Mon, 21 Feb 2011 16:30:05 -0800	[thread overview]
Message-ID: <4D63038D.6060904@redhat.com> (raw)
In-Reply-To: <AANLkTim-t+69fcnan8HMsSuq+BCvVn2bfK4CRigO_iHn@mail.gmail.com>

On 02/21/2011 03:52 PM, Roberto Spadim wrote:
> trim tell harddisk that those block are not in use
>
> not in use block can be used by harddisk reallocation algorithm, like
> spare sectors
>
> hard disks can use TRIM command to 'create' 'good' blocks like spare sectors

I'm trying really hard to follow what this means but just can't grasp 
what you're getting at.  What scenario is there in which trim actually 
does anything for you on an HD?  I can't think of any situation where 
this makes any sense for HDs with current firmware functionality.  If a 
sector is unused, but bad, you won't know until you write to it.  If 
it's bad and you write to it, the write gets reallocated to a good spare 
sector.  Are you proposing to notify the drive what sectors are unused 
so it can check for and reallocate bad blocks before they're used again? 
  Something else?

-- 
Brendan Conoboy / Red Hat, Inc. / blc@redhat.com

  parent reply	other threads:[~2011-02-22  0:30 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-02-07 20:07 SSD - TRIM command Roberto Spadim
2011-02-08 17:37 ` maurice
2011-02-08 18:31   ` Roberto Spadim
     [not found]     ` <AANLkTik5SumqyTN5LZVntna8nunvPe7v38TSFf9eCfcU@mail.gmail.com>
2011-02-08 20:50       ` Roberto Spadim
2011-02-08 21:18         ` maurice
2011-02-08 21:33           ` Roberto Spadim
2011-02-09  7:44   ` Stan Hoeppner
2011-02-09  9:05     ` Eric D. Mudama
2011-02-09 15:45       ` Chris Worley
2011-02-09 13:29     ` David Brown
2011-02-09 14:39       ` Roberto Spadim
2011-02-09 15:00         ` Scott E. Armitage
2011-02-09 15:52           ` Chris Worley
2011-02-09 19:15             ` Doug Dumitru
2011-02-09 19:22               ` Roberto Spadim
2011-02-09 16:19           ` Eric D. Mudama
2011-02-09 16:28             ` Scott E. Armitage
2011-02-09 17:17               ` Eric D. Mudama
2011-02-09 18:18                 ` Roberto Spadim
2011-02-09 18:24                   ` Piergiorgio Sartor
2011-02-09 18:30                     ` Roberto Spadim
2011-02-09 18:38                       ` Piergiorgio Sartor
2011-02-09 18:46                         ` Roberto Spadim
2011-02-09 18:52                           ` Roberto Spadim
2011-02-09 19:13                           ` Piergiorgio Sartor
2011-02-09 19:16                             ` Roberto Spadim
2011-02-09 19:21                               ` Piergiorgio Sartor
2011-02-09 19:27                                 ` Roberto Spadim
2011-02-21 18:24             ` Phillip Susi
2011-02-21 18:30               ` Roberto Spadim
2011-02-09 15:49         ` David Brown
2011-02-21 18:20           ` Phillip Susi
2011-02-21 18:25             ` Roberto Spadim
2011-02-21 18:34               ` Phillip Susi
2011-02-21 18:48                 ` Roberto Spadim
2011-02-21 18:51               ` Mathias Burén
2011-02-21 19:32                 ` Roberto Spadim
2011-02-21 19:38                   ` Mathias Burén
2011-02-21 19:39                     ` Mathias Burén
2011-02-21 19:43                       ` Roberto Spadim
2011-02-21 20:45                       ` Phillip Susi
2011-02-21 19:39                   ` Roberto Spadim
2011-02-21 19:51                     ` Doug Dumitru
2011-02-21 19:57                       ` Roberto Spadim
2011-02-21 20:47                     ` Phillip Susi
2011-02-21 21:02                       ` Mathias Burén
2011-02-21 22:52                         ` Roberto Spadim
2011-02-21 23:41                           ` Mathias Burén
2011-02-21 23:42                             ` Mathias Burén
2011-02-21 23:52                               ` Roberto Spadim
2011-02-22  0:25                                 ` Mathias Burén
2011-02-22  0:30                                 ` Brendan Conoboy [this message]
2011-02-22  0:36                                 ` Eric D. Mudama
2011-02-22  1:46                                   ` Roberto Spadim
2011-02-22  1:52                                     ` Mathias Burén
2011-02-22  1:55                                       ` Roberto Spadim
2011-02-22  2:01                                         ` Eric D. Mudama
2011-02-22  2:02                                         ` Mikael Abrahamsson
2011-02-22  2:22                                           ` Guy Watkins
2011-02-22  2:27                                             ` Roberto Spadim
2011-02-22  3:45                                               ` NeilBrown
2011-02-22  4:37                                                 ` Roberto Spadim
2011-02-22  2:38                                         ` Phillip Susi
2011-02-22  3:29                                           ` Roberto Spadim
2011-02-22  3:42                                             ` Roberto Spadim
2011-02-22  4:04                                             ` Phillip Susi
2011-02-22  4:30                                               ` Roberto Spadim
2011-02-22 14:45                                                 ` Phillip Susi
2011-02-22 17:15                                                   ` Roberto Spadim
2011-02-22  0:32                           ` Eric D. Mudama

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