Am 27.05.2014 15:03, schrieb Stefan G. Weichinger:
>> way too slow ...
>
> I think I have some IO-topic going on ... very likely some mismatch of
> block sizes ...
>
> the hw-raid, then LVM, then the snapshot on top of that ... and a
> filesystem with properties as target ... oh my.
>
> Chosing noop as IO-scheduler helps a bit but maybe I have to roll back
> and rebuild one of the HW-RAID-Arrays with a different blocksize.
back from short vacation and re-attacking this one ...
I am not sure if I set up the HW-RAIDs correctly and want to move data
away from the LVM (yes, again) to try to rebuild the array /dev/sdc
I have:
# lsblk -o NAME,FSTYPE,UUID,SIZE,TYPE,MOUNTPOINT,LABEL,MODEL,PHY-SEC,MIN-IO
NAME FSTYPE UUID
SIZE TYPE MOUNTPOINT LABEL MODEL PHY-SEC MIN-IO
sda btrfs 9133c469-df1e-45f5-a09f-d1b9c75c69da
500G disk /mnt/defvol ROOT RAID 5/6 SAS 6G 4096 4096
sdb swap 102d41a8-848d-4525-b39e-d9b543355b71
8G disk [SWAP] SWAP RAID 5/6 SAS 6G 4096 4096
sdc LVM2_member
Z2LEVf-ZJch-cqi3-GVob-Jpd2-eweJ-sDtW7H 1,3T disk
RAID 5/6 SAS 6G 4096 4096
├─vg01-amhold xfs 96b7395b-6e81-4660-9459-6a7ad83d8861
400G lvm /mnt/amhold AMHOLD 4096 4096
└─vg01-winserver_disk0
244,1G lvm 4096 4096
(sorry for the ugly format ... should I post a URL?)
Is the value for PHY-SEC my problem? The 4 MB ... ?
-
So sdc is a PV in VG vg01 ... which contains a KVM-diskimage
/dev/vg01/winserver_disk0
I use the noop scheduler btw ...
I try a dd (or ddrescue) from that LV to somewhere else and only get
around 1-5 MB/s ... this takes way too long.
--- example with external disk as target:
ddrescue -v --block-size=4M /dev/vg01/winserver_disk0
/mnt/ext/virt-backup/windows-server/windows-server_vda.img
tried local root-fs as target, different block sizes etc.
---
The system is an updated and stable gentoo amd64 box ->
# emerge --info
Portage 2.2.8-r1 (default/linux/amd64/13.0, gcc-4.7.3, glibc-2.17,
3.12.21-gentoo-r1 x86_64)
=================================================================
System uname:
Linux-3.12.21-gentoo-r1-x86_64-Intel-R-_Xeon-R-_CPU_E5-2407_0_@_2.20GHz-with-gentoo-2.2
KiB Mem: 16413444 total, 9252100 free
KiB Swap: 8388604 total, 8388604 free
Timestamp of tree: Tue, 10 Jun 2014 07:30:01 +0000
ld GNU ld (GNU Binutils) 2.23.2
app-shells/bash: 4.2_p45
dev-lang/python: 2.7.6, 3.2.5-r2, 3.3.3
dev-util/cmake: 2.8.11.2
dev-util/pkgconfig: 0.28
sys-apps/baselayout: 2.2
sys-apps/openrc: 0.12.4
sys-apps/sandbox: 2.6-r1
sys-devel/autoconf: 2.69
sys-devel/automake: 1.13.4
sys-devel/binutils: 2.23.2
sys-devel/gcc: 4.7.3-r1
sys-devel/gcc-config: 1.7.3
sys-devel/libtool: 2.4.2
sys-devel/make: 3.82-r4
sys-kernel/linux-headers: 3.13 (virtual/os-headers)
sys-libs/glibc: 2.17
Repositories: gentoo hiro-oops-intern
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=corei7-avx -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf
/etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=corei7-avx -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified
distlocks ebuild-locks fixlafiles merge-sync news notitles
parallel-fetch preserve-libs protect-owned sandbox sfperms strict
unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv
usersandbox usersync"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://distfiles.gentoo.org";
LANG="de_DE.UTF-8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
PKGDIR="/var/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times
--omit-dir-times --compress --force --whole-file --delete --stats
--human-readable --timeout=180 --exclude=/distfiles --exclude=/local
--exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://172.32.99.6/gentoo-portage"
USE="acl amd64 berkdb bzip2 cli cracklib crypt cxx dri fortran gdbm
iconv ipv6 mmx modules multilib ncurses nls nptl openmp pam pcre
readline session sse sse2 ssl systemd tcpd udev unicode zlib"
ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x
ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel
intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem
ymfpci" APACHE2_MODULES="alias cgi headers filter deflate perl"
CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon
braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load
memory rrdtool swap syslog" CURL_SSL="openssl"
DRACUT_MODULES="biosdevname btrfs caps lvm mdraid" ELIBC="glibc"
GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt
gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore
rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx"
INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad
cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text"
LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer"
OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5"
PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3"
RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev glint
intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via
vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2
ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq
steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL,
PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS,
PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
Taking the hardware it should be much much faster, right?
I would appreciate some hints to debug this.
Maybe I have to remove the OS and the VM again and rebuild the RAIDs
from scratch ...
thanks, Stefan
