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Groups > linux.debian.user > #204072
| From | Reco <recoverym4n@enotuniq.net> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: Overhead of LVM (Re: Upgrade Problem) |
| Date | 2019-01-05 08:40 +0100 |
| Message-ID | <xcOIN-2z4-9@gated-at.bofh.it> (permalink) |
| References | <xccDv-4RQ-15@gated-at.bofh.it> <xcxyi-Jv-7@gated-at.bofh.it> <xcxHX-MG-3@gated-at.bofh.it> <xcLrz-Iz-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi.
On Fri, Jan 04, 2019 at 11:03:48PM -0500, rhkramer@gmail.com wrote:
> On Friday, January 04, 2019 08:23:59 AM Reco wrote:
> > # pvs
> > PV VG Fmt Attr PSize PFree
> > /dev/md10 nas lvm2 a-- 14.55t 10.43t
> >
> > # hdparm -Tt /dev/md10
> > /dev/md10:
> > Timing cached reads: 1224 MB in 2.00 seconds = 612.05 MB/sec
> > Timing buffered disk reads: 1210 MB in 3.00 seconds = 403.28 MB/sec
> >
> > # hdparm -Tt /dev/nas/root
> > /dev/nas/root:
> > Timing cached reads: 1224 MB in 2.00 seconds = 611.55 MB/sec
> > Timing buffered disk reads: 1154 MB in 3.00 seconds = 384.42 MB/sec
> >
> > I see a difference, but I's something I can live with.
>
> Thanks very much!
>
> I need to learn more about pvs (I did google the man page), but I assume the
> /dev/md10 and /dev/nas/root are two ways of referring to the same partition,
> one within LVM, and one not?
md10 is a RAID10 consisting of 4 HDDs. No partitions, just
straightforward block devices.
/dev/nas/root is a logical volume (/ filesystem in this case), it
resides on this md10, as 'pvs' output shows.
Storage hierarchy is a as follows (lsblk, same for sdb, sdc and sdd):
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 1 7.3T 0 disk
└─md0 9:0 0 7.3T 0 raid1
└─md10 9:10 0 14.6T 0 raid0
├─nas-root 254:2 0 15.3G 0 lvm /
So yes, both md10 and /dev/nas/root are two ways of referring to the
same set of bytes on disks.
Reco
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Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 16:00 +0100
Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 17:20 +0100
Re: Fwd: Upgrade Problem steve <dlist@bluewin.ch> - 2019-01-03 17:40 +0100
Re: Upgrade Problem Brad Rogers <brad@fineby.me.uk> - 2019-01-03 18:30 +0100
Re: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 18:40 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 17:40 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 18:20 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 18:40 +0100
Re: Fwd: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-03 19:00 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 20:40 +0100
Re: Fwd: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-03 20:50 +0100
Re: Fwd: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-03 20:50 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 21:20 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 21:30 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-03 21:40 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 22:20 +0100
Re: Fwd: Upgrade Problem Frank Weißer <linux@weisser-ol.de> - 2019-01-04 10:30 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 21:40 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-03 22:30 +0100
Re: Fwd: Upgrade Problem Roberto C. Sánchez <roberto@debian.org> - 2019-01-03 23:00 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-03 23:30 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 01:30 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-04 11:20 +0100
Re: Fwd: Upgrade Problem Roberto C. Sánchez <roberto@debian.org> - 2019-01-04 13:40 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-04 13:40 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 19:00 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-04 19:40 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 20:00 +0100
Re: Fwd: Upgrade Problem Roberto C. Sánchez <roberto@debian.org> - 2019-01-04 20:40 +0100
Re: Fwd: Upgrade Problem Roberto C. Sánchez <roberto@debian.org> - 2019-01-04 21:20 +0100
Re: Fwd: Upgrade Problem Brian <ad44@cityscape.co.uk> - 2019-01-04 21:20 +0100
Re: Fwd: Upgrade Problem Brian <ad44@cityscape.co.uk> - 2019-01-04 20:40 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 22:10 +0100
Re: Fwd: Upgrade Problem mick crane <mick.crane@gmail.com> - 2019-01-05 08:20 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 20:50 +0100
Re: Fwd: Upgrade Problem Brian <ad44@cityscape.co.uk> - 2019-01-04 20:40 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 20:50 +0100
Re: Fwd: Upgrade Problem Andy Smith <andy@strugglers.net> - 2019-01-03 23:10 +0100
Re: Fwd: Upgrade Problem Curt <curty@free.fr> - 2019-01-04 14:10 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 03:30 +0100
Re: Fwd: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-04 14:20 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 14:50 +0100
Re: Fwd: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-04 15:00 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 19:30 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-04 19:40 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 21:00 +0100
Re: Upgrade Problem Joe <joe@jretrading.com> - 2019-01-04 21:30 +0100
Re: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 23:00 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 19:50 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-05 01:40 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-05 06:30 +0100
Re: Fwd: Upgrade Problem <tomas@tuxteam.de> - 2019-01-04 15:50 +0100
Re: Fwd: Upgrade Problem David Wright <deblis@lionunicorn.co.uk> - 2019-01-04 18:10 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-03 21:40 +0100
Re: Fwd: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-03 19:00 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 19:00 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 20:20 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 20:50 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 21:40 +0100
Re: Fwd: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 21:50 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-03 22:10 +0100
Re: Fwd: Upgrade Problem songbird <songbird@anthive.com> - 2019-01-04 03:20 +0100
Re: Fwd: Upgrade Problem deloptes <deloptes@gmail.com> - 2019-01-04 09:10 +0100
Re: Fwd: Upgrade Problem Gene Heskett <gheskett@shentel.net> - 2019-01-04 03:40 +0100
Re: Upgrade Problem Felix Miata <mrmazda@earthlink.net> - 2019-01-04 04:50 +0100
Re: Upgrade Problem Andy Smith <andy@strugglers.net> - 2019-01-04 09:50 +0100
Overhead of LVM (Re: Upgrade Problem) rhkramer@gmail.com - 2019-01-04 14:20 +0100
Re: Overhead of LVM (Re: Upgrade Problem) Reco <recoverym4n@enotuniq.net> - 2019-01-04 14:30 +0100
Re: Overhead of LVM (Re: Upgrade Problem) rhkramer@gmail.com - 2019-01-05 05:10 +0100
Re: Overhead of LVM (Re: Upgrade Problem) Reco <recoverym4n@enotuniq.net> - 2019-01-05 08:40 +0100
Re: Upgrade Problem Richard Hector <richard@walnut.gen.nz> - 2019-01-04 21:10 +0100
Re: Upgrade Problem Stefan Krusche <linux@stefan-krusche.de> - 2019-03-10 14:30 +0100
Re: Upgrade Problem Nicolas George <george@nsup.org> - 2019-01-04 11:20 +0100
Re: Upgrade Problem Patrick Bartek <nemommxiv@gmail.com> - 2019-01-03 18:20 +0100
Re: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 18:40 +0100
Re: Upgrade Problem Patrick Bartek <nemommxiv@gmail.com> - 2019-01-04 03:20 +0100
Re: Upgrade Problem Matthew Crews <mailinglists@mattcrews.com> - 2019-01-04 03:50 +0100
Re: Upgrade Problem Andy Smith <andy@strugglers.net> - 2019-01-04 10:00 +0100
Re: Upgrade Problem Felix Miata <mrmazda@earthlink.net> - 2019-01-04 10:40 +0100
Re: Upgrade Problem David Wright <deblis@lionunicorn.co.uk> - 2019-01-04 17:30 +0100
Re: Upgrade Problem Felix Miata <mrmazda@earthlink.net> - 2019-01-04 19:50 +0100
Re: Upgrade Problem David Wright <deblis@lionunicorn.co.uk> - 2019-01-04 21:30 +0100
Re: allocating disk space (was: Upgrade Problem) Felix Miata <mrmazda@earthlink.net> - 2019-01-05 01:40 +0100
Re: allocating disk space (was: Upgrade Problem) David Wright <deblis@lionunicorn.co.uk> - 2019-01-10 01:10 +0100
Re: allocating disk space Felix Miata <mrmazda@earthlink.net> - 2019-01-11 08:20 +0100
Re: allocating disk space David Wright <deblis@lionunicorn.co.uk> - 2019-01-13 14:20 +0100
Re: Upgrade Problem Brian <ad44@cityscape.co.uk> - 2019-01-04 11:50 +0100
Re: Upgrade Problem Reco <recoverym4n@enotuniq.net> - 2019-01-04 13:00 +0100
Re: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-04 14:30 +0100
Re: Upgrade Problem songbird <songbird@anthive.com> - 2019-01-03 20:00 +0100
Re: Upgrade Problem "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-01-03 20:40 +0100
Re: Upgrade Problem David Wright <deblis@lionunicorn.co.uk> - 2019-01-03 21:00 +0100
Re: Upgrade Problem Greg Wooledge <wooledg@eeg.ccf.org> - 2019-01-03 21:10 +0100
Re: Upgrade Problem Michael Stone <mstone@debian.org> - 2019-01-04 16:00 +0100
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