From: "H. Peter Anvin" <hpa@zytor.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Andreas Dilger <adilger@sun.com>, Karel Zak <kzak@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
util-linux-ng@vger.kernel.org
Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable)
Date: Sun, 10 Jan 2010 23:27:10 -0800 [thread overview]
Message-ID: <4B4AD2CE.8040207@zytor.com> (raw)
In-Reply-To: <yq1ocl187ww.fsf@sermon.lab.mkp.net>
On 01/10/2010 10:36 PM, Martin K. Petersen wrote:
>>>>>> "Andreas" == Andreas Dilger <adilger@sun.com> writes:
>
> Andreas> I agree whole heartedly. We steer users very sharply away from
> Andreas> using partitions at all, because on h/w RAID devices the
> Andreas> 512-byte offset from fdisk completely kills RAID-5/6
> Andreas> performance.
>
> I don't have a problem aligning to 1MB (taking alignment_offset into
> account) by default but there needs to be an easy override. There are
> RAID arrays that internally compensate for the legacy 63 sector offset
> and we'll cause misalignment if we start at 1MB on those.
>
> I'm heavily lobbying our storage partners to make sure they fill out the
> right SCSI bits if their LUNs are not naturally aligned. But there are
> obviously going to be legacy devices out there that will need manual
> alignment compensation.
>
Yes, but we shouldn't default to braindead mode.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
To: "Martin K. Petersen"
<martin.petersen-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Andreas Dilger <adilger-xsfywfwIY+M@public.gmane.org>,
Karel Zak <kzak-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
util-linux-ng-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [ANNOUNCE] util-linux-ng v2.17 (stable)
Date: Sun, 10 Jan 2010 23:27:10 -0800 [thread overview]
Message-ID: <4B4AD2CE.8040207@zytor.com> (raw)
In-Reply-To: <yq1ocl187ww.fsf-+q57XtR/GgMb6DWv4sQWN6xOck334EZe@public.gmane.org>
On 01/10/2010 10:36 PM, Martin K. Petersen wrote:
>>>>>> "Andreas" == Andreas Dilger <adilger-xsfywfwIY+M@public.gmane.org> writes:
>
> Andreas> I agree whole heartedly. We steer users very sharply away from
> Andreas> using partitions at all, because on h/w RAID devices the
> Andreas> 512-byte offset from fdisk completely kills RAID-5/6
> Andreas> performance.
>
> I don't have a problem aligning to 1MB (taking alignment_offset into
> account) by default but there needs to be an easy override. There are
> RAID arrays that internally compensate for the legacy 63 sector offset
> and we'll cause misalignment if we start at 1MB on those.
>
> I'm heavily lobbying our storage partners to make sure they fill out the
> right SCSI bits if their LUNs are not naturally aligned. But there are
> obviously going to be legacy devices out there that will need manual
> alignment compensation.
>
Yes, but we shouldn't default to braindead mode.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
--
To unsubscribe from this list: send the line "unsubscribe util-linux-ng" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2010-01-11 7:27 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 9:33 [ANNOUNCE] util-linux-ng v2.17 (stable) Karel Zak
2010-01-08 9:33 ` Karel Zak
2010-01-08 21:43 ` H. Peter Anvin
2010-01-08 22:40 ` Andreas Dilger
2010-01-08 22:40 ` Andreas Dilger
2010-01-08 23:33 ` H. Peter Anvin
2010-01-08 23:33 ` H. Peter Anvin
2010-01-11 6:36 ` Martin K. Petersen
2010-01-11 6:36 ` Martin K. Petersen
2010-01-11 7:27 ` H. Peter Anvin [this message]
2010-01-11 7:27 ` H. Peter Anvin
2010-01-11 14:05 ` Pavel Machek
2010-01-11 14:05 ` Pavel Machek
2010-01-11 16:52 ` H. Peter Anvin
2010-01-11 20:17 ` Pavel Machek
2010-01-11 20:17 ` Pavel Machek
2010-01-11 23:26 ` H. Peter Anvin
2010-01-11 23:26 ` H. Peter Anvin
2010-01-12 13:33 ` Artem Bityutskiy
2010-01-12 13:33 ` Artem Bityutskiy
2010-01-12 13:35 ` Artem Bityutskiy
2010-01-12 13:35 ` Artem Bityutskiy
2010-01-11 19:17 ` Artem Bityutskiy
2010-01-11 19:17 ` Artem Bityutskiy
2010-01-12 7:19 ` Jörn Engel
2010-01-12 8:19 ` H. Peter Anvin
2010-01-12 8:19 ` H. Peter Anvin
2010-01-12 9:37 ` Jörn Engel
2010-01-12 9:37 ` Jörn Engel
2010-01-12 16:20 ` H. Peter Anvin
2010-01-12 16:20 ` H. Peter Anvin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B4AD2CE.8040207@zytor.com \
--to=hpa@zytor.com \
--cc=adilger@sun.com \
--cc=kzak@redhat.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=util-linux-ng@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.