SAP HANA Express Edition on AWS for XSA development space issues

[jmalla]

Hi Folks,

I am writing this BLOG about my experience trying to do XSA development on the SAP HANA Express edition on AWS and the space issues I ran into and how I addressed it.  If you are using the HANA Express Edition on AWS, and if you are running into strange behavior and space issues, this BLOG may be helpful.

I launched the SAP HANA, Express Edition on AWS through CAL.

Once it ran, I ran across many issues.

A few things to help out so that I could get start developing:

• started nodejstools explicitly.


• create a space and explicitly redeployed the builder using the di-space-enablement tool

I was encountering a lot of strange issues and then found out the they could be happening due to disk space issues.  The biggest issue I had was the the logical volume /dev/mapper/vga-sysfiles was getting filled up.  I started deleting log files and any files that were not necessary.  But this did not help.

I was having the issue of /dev/mapper/vga-sysfiles getting filled up to 100%.  I cleared the log files, and would start the system at 95% as shown here - but that would fill up to 100% relatively quickly.

sid-hxe:~ # df

Filesystem                 1K-blocks     Used Available Use% Mounted on

/dev/hda1                   10189112  3035020   6613472  32% /

devtmpfs                    15721704        8  15721696   1% /dev

tmpfs                       40897116        0  40897116   0% /dev/shm

tmpfs                       15730604     9900  15720704   1% /run

tmpfs                       15730604        0  15730604   0% /sys/fs/cgroup

/dev/mapper/vgcal-sysfiles  42985920 40757896   2228024  95% /hana/shared/HXE

/dev/mapper/vgcal-dbdata    60819392  8848024  51971368  15% /hana/data/HXE

/dev/mapper/vgcal-dblog     33553344  2002172  31551172   6% /hana/log/HXE

 

So here are the steps.

Through the AWS EC2 console, click on Volumes under the ELASTIC BLOCK STORE option on the left sidebar window and then click on Create Volume:



 

I chose a 50 GB Magnetic volume type:



 

The volume is created.  Note the Volume ID.



Now attach this Volume to the instance (SAP HANA Express in my case)



 



Log into the SAP HANA system.

 

Extend the volume group vgcal (in my case) to include this new volume.  If you need the volume group, run vgdisplay and get the VG name

sid-hxe:~ # vgextend vgcal /dev/xvdt

  Physical volume "/dev/xvdt" successfully created

  Volume group "vgcal" successfully extended

 

Here is the file system:



 

Once the volume is attached, we need to extend the logical volume /dev/vgcal/sysfiles to use this volume - note the change from 41 GB to 91 GB:

sid-hxe:~ # lvextend -i 1 -r /dev/vgcal/sysfiles /dev/xvdt

  Size of logical volume vgcal/sysfiles changed from 41.02 GiB (10500 extents) to 91.01 GiB (23299 extents).

  Logical volume sysfiles successfully resized

meta-data=/dev/mapper/vgcal-sysfiles isize=256    agcount=16, agsize=671984 blks

         =                       sectsz=512   attr=2, projid32bit=1

         =                       crc=0        finobt=0

data     =                       bsize=4096   blocks=10751744, imaxpct=25

         =                       sunit=16     swidth=192 blks

naming   =version 2              bsize=4096   ascii-ci=0 ftype=0

log      =internal               bsize=4096   blocks=5264, version=2

         =                       sectsz=512   sunit=16 blks, lazy-count=1

realtime =none                   extsz=4096   blocks=0, rtextents=0

data blocks changed from 10751744 to 23858176

So the additional 50 GB is available now for /dev/mapper/vgcal-sysfiles

sid-hxe:~ # df -h

Filesystem                  Size  Used Avail Use% Mounted on

/dev/hda1                   9.8G  6.5G  2.8G  70% /

devtmpfs                     15G  8.0K   15G   1% /dev

tmpfs                        40G     0   40G   0% /dev/shm

tmpfs                        16G   18M   15G   1% /run

tmpfs                        16G     0   16G   0% /sys/fs/cgroup

/dev/mapper/vgcal-sysfiles   91G   41G   51G  45% /hana/shared/HXE

/dev/mapper/vgcal-dbdata     59G  8.5G   50G  15% /hana/data/HXE

/dev/mapper/vgcal-dblog      32G  2.0G   31G   6% /hana/log/HXE

 

sid-hxe:~ # lvdisplay

  --- Logical volume ---

  LV Path                /dev/vgcal/dbdata

  LV Name                dbdata

  VG Name                vgcal

  LV UUID                trUgvA-oNiA-QHUM-HYMY-2URJ-bp4z-5YKYOQ

  LV Write Access        read/write

  LV Creation host, time ip-10-0-22-11, 2017-09-01 11:26:20 +0000

  LV Status              available

  # open                 1

  LV Size                58.03 GiB

  Current LE             14856

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     3072

  Block device           254:0

   

  --- Logical volume ---

  LV Path                /dev/vgcal/dblog

  LV Name                dblog

  VG Name                vgcal

  LV UUID                7TzNYT-bRRX-wbpA-L5xx-xAEO-RO5R-GpB2aN

  LV Write Access        read/write

  LV Creation host, time ip-10-0-22-11, 2017-09-01 11:26:26 +0000

  LV Status              available

  # open                 1

  LV Size                32.02 GiB

  Current LE             8196

  Segments               1

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     3072

  Block device           254:1

   

  --- Logical volume ---

  LV Path                /dev/vgcal/sysfiles

  LV Name                sysfiles

  VG Name                vgcal

  LV UUID                zCjmzn-yjgf-VENQ-HCW1-Af5J-TPAx-fOkEm0

  LV Write Access        read/write

  LV Creation host, time ip-10-0-22-11, 2017-09-01 11:26:27 +0000

  LV Status              available

  # open                 1

  LV Size                91.01 GiB

  Current LE             23299

  Segments               2

  Allocation             inherit

  Read ahead sectors     auto

  - currently set to     3072

  Block device           254:2

 

After I did this, the system was behaving much better and I could work on the XSA development.  More BLOGs to follow on the SAP HANA XSA development.  I did refer to the following  article: Increase disk space on AWS for SAP CAL system -
https://archive.sap.com/discussions/thread/3739935

But i added the additional steps to get this working for the instance.

 

Enjoy,

Jay

 

You can connect with me at - Jay Malla on LinkedIn