From: Roberto Spadim <roberto@spadim.com.br>
To: maurice <mhilarius@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: SSD - TRIM command
Date: Tue, 8 Feb 2011 16:31:24 -0200 [thread overview]
Message-ID: <AANLkTi=sgTjGMvNiZB2aqxpe8-z7V0bUks84+fMxCAoY@mail.gmail.com> (raw)
In-Reply-To: <4D517F4F.4060003@gmail.com>
it's resync running?
i don't think it's a problem...
any device will die some day...
ssd is faster than hd, why not use it?
i'm using hp smart array p212 with 3.0 firmware, it write on all blocks too
maybe a just command line option to start array without sync could help...
i don't know if resync is write intensive or just write on diferent
blocks, if it's just diff it's not a problem for ssd...
again...
i know that the 'translate' of trim command to non compatible devices
is a problem for device layer not md layer, but can md send trim
command to all mirrors/disks?
2011/2/8 maurice <mhilarius@gmail.com>:
> On 2/7/2011 1:07 PM, Roberto Spadim wrote:
>>
>> hi guys, could md send TRIM command to ssd? using ext4 discart mount
>> option?
>> if i mix ssd and hd, could this TRIM be rewrite to non TRIM compatible
>> disks?
>>
> I have read that using md with SSDs is not a great idea:
> Form the Fedora 14 documentation:
>
> "Take note as well that software RAID levels 1, 4, 5, and 6 are not
> recommended for use on SSDs.
> During the initialization stage of these RAID levels, some RAID management
> utilities (such as mdadm)
> write to all of the blocks on the storage device to ensure that checksums
> operate properly.
> This will cause the performance of the SSD to degrade quickly. "
>
> https://docs.fedoraproject.org/en-US/Fedora/14/html/Storage_Administration_Guide/newmds-ssdtuning.html
>
>
> --
> Cheers,
> Maurice Hilarius
> eMail: /mhilarius@gmail.com/
> --
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--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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next prev parent reply other threads:[~2011-02-08 18:31 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 [this message]
[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
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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