Differences between revisions 45 and 46
⇤ ← Revision 45 as of 2009-07-15 13:37:40 →
Size: 11794
Editor: FelixFrank
Comment: Removed obsolete stuff
← Revision 46 as of 2009-07-30 08:12:42 → ⇥
Size: 3011
Editor: WaltrautNiepraschk
Comment: - archiving
Deletions are marked like this. Additions are marked like this.
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= Archiving =
== Manually creating archival copies ==
The most simple way is to tell the fileserver to create a file copy in an archival osd: {{{
# fs archive ascii-file
ascii-file done
}}}
An alternative to this is the `fs fidarchive` subcommand.

It is also possible to specify the desired archive: {{{
# osd l
 id name(loc) ---total space--- flag prior. own. server lun size range
  1 local_disk wr rd (0kb-1mb)
 13 ssu12 1781 gb 0.0 % up 55 64 ssu12.if 2 (1mb-64gb)
 14 ssu13 1781 gb 0.0 % up 55 64 ssu13.if 2 (1mb-64gb)
 15 z19mini 91 gb 2.3 % up hsm 64 64 zyklop19 0 (1mb-1gb)
 16 z19maxi 458 gb 0.0 % up 55 64 zyklop19 2 (1mb-64gb)
 17 arch1 458 gb 0.0 % up arch 55 64 zyklop20 0 (0kb-2tb)
 18 arch2 458 gb 0.0 % up arch 55 64 zyklop20 1 (0kb-2tb)
 19 z20online 391 gb 0.0 % up 55 64 zyklop20 2 (1mb-64gb)
# fs archive ascii-file -osd 18
ascii-file done
# fs osd archive-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=3, 2009-01-28 09:55:34, 1 segm, flags=0x0
    segment:
        lng=44537893, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=18, stripe=0
    metadata:
        md5=a64535612df9ff989b4bd6d6a133fb5d as from 2009-01-28 09:56:36
}}}
The archival copy is on osd 18 (zyklop20, vicepb = lun 1).

/!\ There is no warning about existent copies. Repeat the command: {{{
[iokaste] /afs/desytest/field_test # fs arch ascii-file -osd 18
ascii-file done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=3, 2009-01-28 09:55:34, 1 segm, flags=0x0
    segment:
        lng=44537893, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=18, stripe=0
    metadata:
        md5=a64535612df9ff989b4bd6d6a133fb5d as from 2009-01-28 09:56:36
}}}
The call is silently ignored.

Change the data: {{{
[iokaste] /afs/desytest/field_test # echo More data >> ascii-file
[iokaste] /afs/desytest/field_test # fs arch ascii-file -osd 18
ascii-file done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=5, 2009-01-28 09:59:27, 1 segm, flags=0x0
    segment:
        lng=44537903, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.1, osd=18, stripe=0
    metadata:
        md5=1891d17de5eb67c0bd30d54952ea0325 as from 2009-01-28 09:59:43
}}}
The copy is updated.

Another update: {{{
[iokaste] /afs/desytest/field_test # echo More data yet >>| ascii-file
[iokaste] /afs/desytest/field_test # fs arch ascii-file
ascii-file done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=7, 2009-01-28 10:00:46, 1 segm, flags=0x0
    segment:
        lng=44537917, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=18, stripe=0
    metadata:
        md5=eec1410b6ae326e6c9173802122372c0 as from 2009-01-28 10:00:51
}}}
Even without specifying the target osd, the system correctly assumes that the archive should be refreshed.

Without updates: {{{
[iokaste] /afs/desytest/field_test # fs arch ascii-file
ascii-file done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 436 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=7, 2009-01-28 10:00:46, 1 segm, flags=0x0
    segment:
        lng=44537917, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=18, stripe=0
    metadata:
        md5=eec1410b6ae326e6c9173802122372c0 as from 2009-01-28 10:00:51
Archive, dv=7, 2009-01-28 10:00:51, 1 segm, flags=0x0
    segment:
        lng=44537917, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=17, stripe=0
    metadata:
        md5=eec1410b6ae326e6c9173802122372c0 as from 2009-01-28 10:02:07
}}}
Another archived copy was created, same data (as per md5data).

A last update: {{{
[iokaste] /afs/desytest/field_test # echo And even more data >> ascii-file
[iokaste] /afs/desytest/field_test # fs arch ascii-file
ascii-file done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=4096, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=9, 2009-01-28 10:02:54, 1 segm, flags=0x0
    segment:
        lng=44537936, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.1, osd=17, stripe=0
    metadata:
        md5=150103c2d7bcfc367b707df35801cdfa as from 2009-01-28 10:02:59
}}}
The copy in osd 17 is updated, the "old" archive in osd 18 is discarded.

== Wiping files ==
If the data is archived, it can be wiped from its actual OSD: {{{
[iokaste] /afs/desytest/field_test # fs wipe ascii-file
done
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 160 bytes of osd metadata, v=3
Archive, dv=9, 2009-01-28 10:02:54, 1 segm, flags=0x2
    segment:
        lng=44537936, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.1, osd=17, stripe=0
    metadata:
        md5=150103c2d7bcfc367b707df35801cdfa as from 2009-01-28 10:02:59
}}}

On an access, it is silently restored to an "normal" osd: {{{
[iokaste] /afs/desytest/field_test # head ascii-file
[1177711200] LOG ROTATION: DAILY
[1177711200] LOG VERSION: 2.0
[1177711200] CURRENT HOST STATE: a;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.13 ms
[1177711200] CURRENT HOST STATE: amafs;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.14 ms
[1177711200] CURRENT HOST STATE: aphrodite;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.54 ms
[1177711200] CURRENT HOST STATE: aquila;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.25 ms
[1177711200] CURRENT HOST STATE: ares;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.59 ms
[1177711200] CURRENT HOST STATE: argus;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.16 ms
[1177711200] CURRENT HOST STATE: artax;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 1.08 ms
[1177711200] CURRENT HOST STATE: arwen;UP;HARD;1;PING OK - Packet loss = 0%, RTA = 0.18 ms
[iokaste] /afs/desytest/field_test # fs osd ascii-file
ascii-file has 284 bytes of osd metadata, v=3
On-line, 1 segm, flags=0x0
    segment:
        lng=0, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.0, osd=15, stripe=0
Archive, dv=9, 2009-01-28 10:02:54, 1 fetches, last: 2009-01-28, 1 segm, flags=0x2
    segment:
        lng=44537936, offs=0, stripes=1, strsize=0, cop=1, 1 objects
        object:
            obj=536871001.6.207.1, osd=17, stripe=0
    metadata:
        md5=150103c2d7bcfc367b707df35801cdfa as from 2009-01-28 10:02:59
}}}
The osd is selected the same way as always - depending on priorities, usage percentage, owner etc.

== Automatic archiving ==
The `archiver` script is included in the OpenAFS+OSD sources. It runs infinitely and searches unarchived files in short intervals. It runs `fs fidarchive` on them.

The `wiper` script will traverse OSDs that have the "hsm" flag set using {{{
# osd setosd <id> -wipeable
}}}
On those, files that have not been accessed for a while are wiped, so that only their latest archival copy remains in storage.

The scripts have yet to be ported to our specific requirements (as far as they differ from Garching's).

Contents

  1. Important notes
  2. Building OpenAFS-OSD
    1. Quick RPM creation
  3. Enabeling the client
  4. Enabling OSD
  5. Issues
    1. Missing token is not handled well
  6. Performance

Sub pages:

/Archivierung   /Build   /Debugging   /FAQ   /Issues   /Logs   /LustreTestsZeuthen   /Notes   /Patches   /Performance   /Performance/Kernel   /Performance/System   /Performance/Szenario   /Production   /Protocol-2008-09-03   /SetupInstructions   /Subversion   /UsageInstructions   /UsageInstructions/FsSubcommands   /UsageInstructions/OsdSubcommands   /UsageInstructions/VosSubcommands   /policies  

Important notes

On phobos, /root/.zshenv now contains 

PATH=/usr/heimdal/bin:/usr/afs/bin:$PATH

Building OpenAFS-OSD

To build openafs, kernel headers are recommended to be installed (so configure can detect the local sysname). On SL5, as root do a 

yum install kernel-devel

and you're set (for the time being). If there's still no /usr/src/linux: 

ln -s /usr/src/kernels/2.6.18-92.1.10.el5-i686 /usr/src/linux

...or whatever directory the kernel source was installed to.

In the openafs-version directory: 

mkdir `sys`
cd `sys`
../configure --prefix=/usr --libdir=/usr/lib --bindir=/usr/bin --sbindir=/usr/sbin --with-krb5-conf --enable-bitmap-later --enable-bos-restricted-mode --enable-fast-restart --enable-bos-new-config --enable-supergroups --enable-transarc-paths --enable-object-storage --enable-osd-policies

Quick RPM creation

See TestCellSetup/IncludingFileservers.

Enabeling the client

  • Manually:

    • From the source directory copy 

      src/libafs/MODLOAD-`uname -r`-*/libafs.ko

      to 

      /lib/modules/`uname -r`/kernel/fs/openafs/libafs.ko 
    • depmod
  • or
    • install appropriate kernel module RPM
  • reboot

  • launch afsd

Enabling OSD

[iokaste] ~ # vos setfields osdtestvol2 -osd 1

Issues

Missing token is not handled well

$ osd volumes io -lun 1
RX xdr error
Cannot list volumes
Request aborted.
    
$ osd createv io 1 536870924
Createvolume failed: RXOSD_create_part ended with 13
Request aborted.

In general, missing privileges are an issue but there is no "friendly output" describing the cause of the problem. Some examples of unprivileged access attempts:

fs osd

Error 13 reading length of metadata

works with r privilege granted to system:anyuser

osd read

RX xdr error \\ Cannot read the object \\ rx_EndCall returns: 13 \\ Request aborted.

requires token

osd volumes

RX xdr error \\ Cannot list volumes \\ Request aborted.

requires token

osd examine

RXOSD_examine failed with code 13 \\ Request aborted.

requires token

Database queries osd listosds and osd servers seem to work unauthenticated.

Performance

Server version

Clients version

process

max. throughput [MB/s]

1.4.7.osd.r302.sec

1.4.7.osd.r302.sec

fileserver

160

rxosd

120

1.4.7

fileserver

160

1.4.8

fileserver

125

1.4.10

fileserver

125

1.4.8.osd.r573x

fileserver

125

rxosd

100

1.4.10.osd.nosvn

fileserver

125

rxosd

72

1.4.7

fileserver

160

1.4.8

fileserver

125

1.4.10

fileserver

125

1.4.10

fileserver

125

1.4.7

fileserver

160

AfsOsd (last edited 2009-08-17 16:11:48 by WaltrautNiepraschk)