From: Mark Lord <mlord@pobox.com>
To: Lukas Czerner <lczerner@redhat.com>
Cc: "Prof. Dr. Klaus Kusche" <klaus.kusche@computerix.info>,
Ric Wheeler <ricwheeler@gmail.com>,
dgilbert@interlog.com, linux-scsi@vger.kernel.org
Subject: Re: Good SAS adapters for 6 Gb/s SATA SSD's (with TRIM)?
Date: Fri, 12 Aug 2011 08:32:02 -0400 [thread overview]
Message-ID: <4E451D42.5050809@pobox.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1108121143430.4535@dhcp-27-109.brq.redhat.com>
On 11-08-12 05:52 AM, Lukas Czerner wrote:
..
> wiper.sh is just a hack to do rally nasty thing to the filesystam
> (allocating all free space)
It actually does NOT allocate all of the free space,
but yes it does reserve *most* of it, leaving a few percent
or a few hundred MB free while it issues the DSM/TRIM commands.
And it uses the fallocate system call, so the reserved space
is not actually written to when reserved, nor when later freed.
I expect the next version of it to include support for FSTRIM,
but that is a much slower method, especially for offline TRIM.
Cheers
--
Mark Lord
Real-Time Remedies Inc.
mlord@pobox.com
next prev parent reply other threads:[~2011-08-12 12:32 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-11 15:18 Good SAS adapters for 6 Gb/s SATA SSD's (with TRIM)? Prof. Dr. Klaus Kusche
2011-08-11 19:59 ` Douglas Gilbert
2011-08-12 3:19 ` Douglas Gilbert
2011-08-12 7:16 ` Stefan /*St0fF*/ Hübner
2011-08-12 13:42 ` Douglas Gilbert
2011-08-14 19:59 ` Stefan Hübner
2011-08-12 8:04 ` Prof. Dr. Klaus Kusche
2011-08-12 8:15 ` Ric Wheeler
2011-08-12 8:48 ` Prof. Dr. Klaus Kusche
2011-08-12 9:01 ` Ric Wheeler
2011-08-12 9:24 ` Prof. Dr. Klaus Kusche
2011-08-12 9:35 ` Ric Wheeler
2011-08-12 11:14 ` Lukas Czerner
2011-08-12 9:52 ` Lukas Czerner
2011-08-12 12:32 ` Mark Lord [this message]
2011-08-12 9:17 ` Artem Bokhan
2011-08-12 9:34 ` Artem Bokhan
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