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ASIS bug? Ontap 7.3.4

R_WOLTERSOM
3,048 Views

Hi all,

A few days ago I was at a customer to configure some optimization settings on their FAS2020 running ONTAP 7.3.4 . The NetApp was configured without thin provisioning and deduplication.

After configuring some of the volumes with deduplication I noticed that two of the SAN volumes used for VMware where suddenly full for 100% after turning on dedup. I then tried to resize the volume with a few more GB but the space was swallowed immediately to 100%. Then I turned off dedup and resized the volume again with a few GB. And it still uses the allocated space immediately!

Here's some info about the configuration:

VOLUME options:

VMWAREOS01

nosnap=on, nosnapdir=on, minra=off, no_atime_update=off, nvfail=off,

ignore_inconsistent=off, snapmirrored=off, create_ucode=off,

convert_ucode=off, maxdirsize=9175, schedsnapname=ordinal,

fs_size_fixed=off, compression=off, guarantee=volume, svo_enable=off,

svo_checksum=off, svo_allow_rman=off, svo_reject_errors=off,

no_i2p=off, fractional_reserve=100, extent=off, try_first=volume_grow,

read_realloc=off, snapshot_clone_dependency=off

LUN settings:

  /vol/vmwareos01/vmwareos01/vmwareos01.lun  500.1g (536952700928)  (r/w, online, mapped)

                Comment: "VMWare"

                Serial#: P3S6GoXjA-gI

                Share: none

                Space Reservation: enabled

                Multiprotocol Type: vmware

                Maps: VMWareESX=0

Reservation:

df -r -h vmwareos01

Filesystem               total       used      avail   reserved  Mounted on

/vol/vmwareos01/         600GB      600GB        0GB      392GB  /vol/vmwareos01/

snap reserve               0GB        0GB        0GB        0GB  /vol/vmwareos01/..

I then created a test volume with EXACT the same settings. This volume can be resized with no problems:

Options:

voltest

nosnap=on, nosnapdir=off, minra=off, no_atime_update=off, nvfail=off,

ignore_inconsistent=off, snapmirrored=off, create_ucode=on,

convert_ucode=on, maxdirsize=9175, schedsnapname=ordinal,

fs_size_fixed=off, compression=off, guarantee=volume, svo_enable=off,

svo_checksum=off, svo_allow_rman=off, svo_reject_errors=off, no_i2p=on,

fractional_reserve=100, extent=off, try_first=volume_grow,

read_realloc=off, snapshot_clone_dependency=off

luntest

/vol/TEST/TEST  500m (524288000) (r/w, online)

Comment: "test"

Serial#: P3S6GorDQrOx

Share: none

Space Reservation: enabled

Multiprotocol Type: vmware

reservations:

AST01> df -r -h TEST

Filesystem               total       used      avail   reserved  Mounted on

/vol/TEST/         2048MB     1002MB     1045MB        4KB  /vol/TEST/

snap reserve               0GB        0GB        0GB        0GB  /vol/TEST/              

I browsed through NetApp online bugs, couldn't find any bugs that comes close to my situation.

Any help would be great!

Thanks in advance

-Rick

3 REPLIES 3

haenggi
3,049 Views

If you do not need snapshots, turn of fractional reserve of this volume.

vol options VMWAREOS01 fractional_reserve 0

This should help.

Cheers Michael

R_WOLTERSOM
3,049 Views

Thanks for the reply!

Still it doesn't really explain the reason why the test volume does work and the current volumes don't work..

haenggi
3,049 Views

The dedupe process creates a snapshot at the beginning, so I asume this filled the volume (due to the fractional_reserve). I asume as well, that you have an empty lun in the testvol, so if you create a snapshot there you don't need additional space for the fractional_reserve, as there is no data in the volume.

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