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SME8 Storage under KVM ?

Offline fpausp

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SME8 Storage under KVM ?
« on: April 30, 2012, 12:27:02 PM »
Hi,

I try to build a 6-8TB Storage with SME8b7, I used 4x2TB (virtual) Disks on my KVM-Host and installed sme8 with the bootoption "sme nospare".

At the moment I have only 3,8TB free space:

Code: [Select]
df -h
Dateisystem          Größe Benut  Verf Ben% Eingehängt auf
/dev/mapper/main-root
                      3,8T  2,2G  3,6T   1% /
/dev/md1               99M   19M   76M  20% /boot
tmpfs                 1,8G     0  1,8G   0% /dev/shm



My hdd-setup looks like this:

Code: [Select]
fdisk -lu

Platte /dev/vda: 2147.4 GByte, 2147483648000 Byte
255 heads, 63 sectors/track, 261083 cylinders, zusammen 4194304000 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

    Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/vda1   *          63      208844      104391   fd  Linux raid autodetect
/dev/vda2          208845  4194298394  2097044775   fd  Linux raid autodetect

Platte /dev/vdb: 2147.4 GByte, 2147483648000 Byte
255 heads, 63 sectors/track, 261083 cylinders, zusammen 4194304000 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

    Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/vdb1   *          63      208844      104391   fd  Linux raid autodetect
/dev/vdb2          208845  4194298394  2097044775   fd  Linux raid autodetect

Platte /dev/vdc: 2147.4 GByte, 2147483648000 Byte
255 heads, 63 sectors/track, 261083 cylinders, zusammen 4194304000 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

    Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/vdc1   *          63      208844      104391   fd  Linux raid autodetect
/dev/vdc2          208845  4194298394  2097044775   fd  Linux raid autodetect

Platte /dev/vdd: 2147.4 GByte, 2147483648000 Byte
255 heads, 63 sectors/track, 261083 cylinders, zusammen 4194304000 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

    Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/vdd1   *          63      208844      104391   fd  Linux raid autodetect
/dev/vdd2          208845  4194298394  2097044775   fd  Linux raid autodetect

Platte /dev/md2: 4294.7 GByte, 4294747095040 Byte
2 heads, 4 sectors/track, 1048522240 cylinders, zusammen 8388177920 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

Festplatte /dev/md2 enthält keine gültige Partitionstabelle

Platte /dev/md1: 106 MByte, 106823680 Byte
2 heads, 4 sectors/track, 26080 cylinders, zusammen 208640 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes

Festplatte /dev/md1 enthält keine gültige Partitionstabelle


Code: [Select]
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid1]
md1 : active raid1 vda1[0] vdb1[1] vdc1[2] vdd1[3]
      104320 blocks [4/4] [UUUU]

md2 : active raid5 vdd2[3] vdc2[4](S) vdb2[1] vda2[0]
      4194088960 blocks level 5, 256k chunk, algorithm 2 [3/2] [UU_]
      [>....................]  recovery =  0.8% (18356480/2097044480) finish=2935.9min speed=11798K/sec

unused devices: <none>


Is it normal to get only 3,8TB ?

How can I get more space on a installed System ?


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Offline Jáder

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Re: SME8 Storage under KVM ?
« Reply #1 on: April 30, 2012, 12:55:23 PM »
AFAIK you're using a RAID1 config, so you have half of physical storage available... and that's correct: ~8TB * 0,5 = ~4 TB.
If you like all space, I think you should try: "noraid nolvm"

I'm not sure why do not use nolvm... it's nice to be able to expand disk later... but with virtual disks maybe you can do it other way.
...

Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #2 on: April 30, 2012, 01:28:03 PM »
Hi jader,

Quote
AFAIK you're using a RAID1 config, so you have half of physical storage available... and that's correct: ~8TB * 0,5 = ~4 TB.

I think I use raid 5 on md2:
Code: [Select]
md2 : active raid5 vdd2[3] vdc2[4](S) vdb2[1] vda2[0]
      4194088960 blocks level 5, 256k chunk, algorithm 2 [3/2] [UU_]
      [>....................]  recovery =  0.8% (18356480/2097044480) finish=2935.9min speed=11798K/sec

Do you know what the "(S)" on vdc2 means, is it a spare disk ?
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Offline Jáder

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Re: SME8 Storage under KVM ?
« Reply #3 on: April 30, 2012, 01:35:17 PM »
Yes... sorry... it's true... you're on RAID1 on md1 and RAID5 with SPARE on md2.
and because you said it was installed using "nospare" I think this can be a bug.

BTW: why your RAID is rebuilding ? Wasn't  it done at startup ?

Regards

Jáder
...

Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #4 on: April 30, 2012, 02:01:35 PM »
I tried "sme raid5 nospare", maybe this was not correct ?

I think I should wait of the sync-process is finished, I will then grow the array (md2) with:

Code: [Select]
mdadm --grow /dev/md2 --raid-devices=4
[code]
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Offline Jáder

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Re: SME8 Storage under KVM ?
« Reply #5 on: April 30, 2012, 03:34:01 PM »
AFAIK this was correct.
And thi swiki page: http://wiki.contribs.org/Raid
say a 4 HDDs would be RAID5 + spare... so when you use nospare it should be a 4 HDDs RAID5... I think it's a bug... and should be reported.
Let developers say it's not a bug.

I don't think RAID5 will grow because it thinks there are a spare device!
...

Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #6 on: April 30, 2012, 09:12:39 PM »
I installed another machine with 4x32GB hdd, I used the same bootoptions "sme raid5 nospare". I forgot to say I used a modified sme8 iso (SME8A18V31128.iso), this is sme8 with asterisk ...

I got the same, md1 has 4 hdds and md2 has 3 plus 1 spare ...

I tried to grow with:

Code: [Select]
mdadm --grow /dev/md2 --raid-devices=4

And that looks good, at the moment it is growing ...

Code: [Select]
cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid1]
md1 : active raid1 vda1[0] vdb1[1] vdc1[2] vdd1[3]
      104320 blocks [4/4] [UUUU]

md2 : active raid5 vdd2[2] vdc2[3] vdb2[1] vda2[0]
      66894336 blocks super 0.91 level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      [=>...................]  reshape =  7.5% (2530816/33447168) finish=236.1mi                                                                                  n speed=2179K/sec

unused devices: <none>



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Offline Stefano

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Re: SME8 Storage under KVM ?
« Reply #7 on: April 30, 2012, 09:40:03 PM »
before installing it's a good thing to take a look at boot options (F2 - F3 etc)

in SME8, to create a no spare raid, you must use
Code: [Select]
sme raid=5 spares=0
syntax

AFAIR it's the same in the latest SME7 releases (7.5.1 for sure, just checked)

IMO wiki should be updated
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Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #8 on: May 01, 2012, 12:38:17 PM »
I fired up another vm, my setup on this is 6x8GB hdd. I used "sme raid=5 sme spares=0 sme nolvm" as bootoptions.


The raid looks like:

Code: [Select]
cat /proc/mdstat

Personalities : [raid6] [raid5] [raid4] [raid1]
md1 : active raid1 vdf1[5] vde1[4] vdd1[3] vdc1[2] vdb1[1] vda1[0]
      104320 blocks [6/6] [UUUUUU]

md2 : active raid5 vdf2[5] vde2[4] vdd2[3] vdc2[2] vdb2[1] vda2[0]
      4055040 blocks level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU]

md3 : active raid5 vdf3[5] vde3[4] vdd3[3] vdc3[2] vdb3[1] vda3[0]
      37350400 blocks level 5, 256k chunk, algorithm 2 [6/6] [UUUUUU]

unused devices: <none>



I got only 32GB ?

Code: [Select]
# df -h

Dateisystem          Größe Benut  Verf Ben% Eingehängt auf
/dev/md3               35G  1,7G   32G   5% /
/dev/md1               99M   12M   83M  13% /boot
tmpfs                 990M     0  990M   0% /dev/shm



Raid in detail:

Code: [Select]
mdadm --detail /dev/md1

/dev/md1:
        Version : 0.90
  Creation Time : Tue May  1 11:48:10 2012
     Raid Level : raid1
     Array Size : 104320 (101.89 MiB 106.82 MB)
  Used Dev Size : 104320 (101.89 MiB 106.82 MB)
   Raid Devices : 6
  Total Devices : 6
Preferred Minor : 1
    Persistence : Superblock is persistent

    Update Time : Tue May  1 12:13:44 2012
          State : clean
 Active Devices : 6
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 0

           UUID : 2721bc9b:781c581e:2148e22c:e043485f
         Events : 0.2

    Number   Major   Minor   RaidDevice State
       0     253        1        0      active sync   /dev/vda1
       1     253       17        1      active sync   /dev/vdb1
       2     253       33        2      active sync   /dev/vdc1
       3     253       49        3      active sync   /dev/vdd1
       4     253       65        4      active sync   /dev/vde1
       5     253       81        5      active sync   /dev/vdf1



mdadm --detail /dev/md2

/dev/md2:
        Version : 0.90
  Creation Time : Tue May  1 11:48:10 2012
     Raid Level : raid5
     Array Size : 4055040 (3.87 GiB 4.15 GB)
  Used Dev Size : 811008 (792.13 MiB 830.47 MB)
   Raid Devices : 6
  Total Devices : 6
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Tue May  1 12:01:59 2012
          State : clean
 Active Devices : 6
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 256K

           UUID : 1065bcce:4337aec8:28119fd4:9c8a16c2
         Events : 0.6

    Number   Major   Minor   RaidDevice State
       0     253        2        0      active sync   /dev/vda2
       1     253       18        1      active sync   /dev/vdb2
       2     253       34        2      active sync   /dev/vdc2
       3     253       50        3      active sync   /dev/vdd2
       4     253       66        4      active sync   /dev/vde2
       5     253       82        5      active sync   /dev/vdf2



mdadm --detail /dev/md3

/dev/md3:
        Version : 0.90
  Creation Time : Tue May  1 11:48:13 2012
     Raid Level : raid5
     Array Size : 37350400 (35.62 GiB 38.25 GB)
  Used Dev Size : 7470080 (7.12 GiB 7.65 GB)
   Raid Devices : 6
  Total Devices : 6
Preferred Minor : 3
    Persistence : Superblock is persistent

    Update Time : Tue May  1 12:25:52 2012
          State : clean
 Active Devices : 6
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 256K

           UUID : cb45f02d:8634e6a0:ff716c68:6af753b4
         Events : 0.312

    Number   Major   Minor   RaidDevice State
       0     253        3        0      active sync   /dev/vda3
       1     253       19        1      active sync   /dev/vdb3
       2     253       35        2      active sync   /dev/vdc3
       3     253       51        3      active sync   /dev/vdd3
       4     253       67        4      active sync   /dev/vde3
       5     253       83        5      active sync   /dev/vdf3


These are the mountpoints:

Code: [Select]
mount
/dev/md3 on / type ext3 (rw,usrquota,grpquota)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/md1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)



I got only 32GB, is that correct ?
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Offline Stefano

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Re: SME8 Storage under KVM ?
« Reply #9 on: May 01, 2012, 01:46:27 PM »
how much memory has that VM?

anyway, teorically 8x(6-1)=40 GB is the array capacity
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Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #10 on: May 01, 2012, 02:14:32 PM »
Yes but df -h says 32G on md3, normaly (with lvm) I have only md1 and md2.

Do you know something about md3 ?
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Offline Jáder

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Re: SME8 Storage under KVM ?
« Reply #11 on: May 01, 2012, 06:10:16 PM »
You have almost 40GB: 32GB on md3 + 4GB on md2 + 1GB on md1.
i think everything it's ok... but AFAIK you could start it as "sme nolvm raid=5 spare=0" without repeat "sme"
...

Offline fpausp

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Re: SME8 Storage under KVM ?
« Reply #12 on: May 01, 2012, 07:26:19 PM »
Yes, the last question is with or without "nolvm" under a vm ?

I think I will use 6x2TB for the production system (6hdd are the maximum what I can use on the virtual-host (proxmox) and ~2TB is the biggest per hdd what sme can take).

regards
fpausp
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