How to stop scrubbing in ZFS

 How to stop scrubbing in ZFS:

The simplest way to check data integrity is to initiate an explicit scrubbing of all data within the pool. This operation traverses all the data in the pool once and verifies that all blocks can be read.  

1. Command to check scrubbing is running or not? and how much time it will take to finish scrubbing:

#zpool status

Above command will show you pool name on which scrubbing is running.

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Scrubbing might negatively impact performance, increases I/O operation. So sometime we need to stop the scrubbing.

2. Command to stop scrubbing. 

#zpool scrub -s <pool name>

Regards,

Kiren Jadhav

How to check ZFS snapshot

How to check ZFS snapshot

ZFS snapshot:

A snapshot is a read-only copy of a file system or volume. Snapshots can be created almost instantly, and they initially consume no additional disk space within the pool. However, as data within the active dataset changes, the snapshot consumes disk space by continuing to reference the old data, thus preventing the disk space from being freed.

Command to check snapshots

1. zfs list -t snapshot

Snapshots can be destroyed using below command. 

1.  zfs destroy <snapshot name> 

Regards,

Kumar Jadhav

How to reboot ZFS appliance

 How to reboot ZFS appliance :

Below is the command to reboot ZFS storage:

Login to ak shell prompt and then run below command:

#maintenance system reboot

Regards,

Kalyanjit

How to enable disk locator on ZFS disk

 How to enable disk locator on ZFS disk:

Suppose there is disk failure on ZFS, we can make disk locator "ON" so the failed disk can be identified easily at the time of disk replacement.

Login to ZFS shell login prompt and run below commands:

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ZFSC1:> maintenance hardware

ZFSC1:maintenance hardware> list

             NAME         STATE     MANUFACTURER  MODEL                     SERIAL        RPM    TYPE

chassis-003  1645HEN05Y   faulted   Oracle        Oracle Storage DE2-24C    1645HEN05Y    7200   hdd

Here for chasis (chassis-000, chassis-001, chassis-002 etc..) the disk status is showing as 'OK' and for chassis-003 it is showing status as 'faulted' so we can say one of the disk present in chasis-003 could be failed. 

ZFSC1:maintenance hardware> select chassis-003

ZFSC1:maintenance chassis-003> list

                          disk

                           fan

                           psu

                          slot

HBBLMSZFSC1:maintenance chassis-003> select disk

HBBLMSZFSC1:maintenance chassis-003 disk>

HBBLMSZFSC1:maintenance chassis-003 disk> show

Disks:

          LABEL   STATE     MANUFACTURER  MODEL             SERIAL                        RPM    TYPE

disk-000  HDD 0   ok        HGST          H7390A250SUN8.0T  000555PJG4LV        VLJJG4LV  7200   data

disk-001  HDD 1   ok        HGST          H7390A250SUN8.0T  000555PJXALV        VLJJXALV  7200   data

disk-002  HDD 2   ok        HGST          H7390A250SUN8.0T  000555PGGRPV        VLJGGRPV  7200   data

disk-003  HDD 3   faulted   HGST          H7390A250SUN8.0T  000555PGHD0V        VLJGHD0V  7200   data

ZFSC1:maintenance chassis-003 disk> select disk-003

ZFSC1:maintenance chassis-003 disk-003> ls

Properties:

                         label = HDD 3

                       present = true

                       faulted = true

                  manufacturer = HGST

                         model = H7390A250SUN8.0T

                        serial = 000555PGHD0V        VLJGHD0V

                      revision = P9E2

                          size = 7.15T

                          type = data

                           use = data

                           rpm = 7200

                        device = c0t5000CCA2608B17DCd0

                     pathcount = 2

                     interface = SAS

                        locate = false

                       offline = false

ZFSC1:maintenance chassis-003 disk-003> set locate=true

                        locate = true (uncommitted)

ZFSC1:maintenance chassis-003 disk-003> commit

ZFSC1:maintenance chassis-003 disk-003> ls

Properties:

                         label = HDD 3

                       present = true

                       faulted = true

                  manufacturer = HGST

                        locate = true

                       offline = false

ZFSC1:maintenance chassis-003 disk-003>

Regards,

Kiran Jaddhav

How To get ZFS storage serial number + ZFS

How To get ZFS storage serial number, model number and OS details: 

Login to ZFS

zfsc1:> configuration version show

or 

zfsc1:> maintenance hardware show

Regards,

Kiran Jaddhav

How to generate (ak) Support bundles on ZFS storage

How to generate (ak) Support bundles on ZFS storage:

Step 1 : Login to ZFS

 zfsc1:> maintenance system bundle

bundle   bundles

zfsc1:> maintenance system bundle    ---> Main command

The support data you requested is being built in 3 files. Use 'send <srn>' with each bundle to associate the bundle with a Service Request Number and send it to

Oracle Support. Alternatively, you may download the bundles via the appliance BUI.

    ak.938k008c-9e13-4593-9305-b54d87659710.tar.gz

    ak.3b22kdbf-c95i-4b6a-be85-d89f58b18b97.tar.gz

    ak.eee2580k-bfi8-6442-defe-e9faccd32fb7.tar.gz

then 

zfsc1:> confirm shell              ----- We will get shell prompt

step 2 : Go to location where bundles get stored

# cd /var/ak/bundles           -- bundles will be stored here with the current date

step 3: We can check the same in ps command as well.

#ps -ef |grep -i bund = to check support bundle process are running or not

Example:

zfsc1# ps -ef |grep -i bund

    root 16467   389   0 13:03:19 ?           0:10 /usr/bin/bash -p /usr/bin/akbundle -b 938k008c-9e13-4593-9305-b54d87659710 -c C

    root  2251 16467   0 13:13:19 ?           0:05 /usr/bin/bash -p /usr/bin/akbundle -b 938k008c-9e13-4593-9305-b54d87659710 -c C

Regards,

Kiren Jadhav