Addition of new disk in existing SDS

Hello,

is there a document that describes how to properly add new disks to an existing storage pool through vCenter Plugin for ScaleIO?

Hello,

You can find the documentation on the ScaleIO v2.0x User Guide, page 230.

Procedure

1. From the SDSs screen, click Actions > Add SDS device.

It may take a moment to load the device list from the vCenter. The Add SDS

Device dialog appears

2. Add devices to an SDS:

a. Select the device to add.

b. If you need to create a VMDK disk, select Create VMDK.

Note

This option is only enabled if you first enable VMDK creation from the

Advanced Settings on the plug-in main screen.

c. Select a Storage Pool for the device.

3. Click OK.

Hello, after the disks were added to the cluster, the rebalance was not started.

How to force rebalancing or or is it some kind of mistake?

GUI - Capacity-In-Use - 0%

Storage Pool scaleio_pool_ssd01 (Id: 1f2c817e00000001) has 1 volumes and 32.0 GB (32768 MB) available for volume allocation

        The number of parallel rebuild/rebalance jobs: 2

        Rebuild is enabled and using No-Limit policy

        Rebalance is enabled and using No-Limit policy

        Background device scanner: Disabled

        Zero padding is disabled

        Spare policy: 26% out of total

        Checksum mode: disabled

        Doesn't use RAM Read Cache

        Doesn't use Flash Read Cache

        Capacity alert thresholds: High: 80, Critical: 90

SDS 8bf6f73f00000009 Name: host.test.local-ESX Version: 2.0.13000

Protection Domain: ba38774400000001, Name: scaleio_pd01

Fault Set: 67bef52900000009, Name: fs11

DRL mode: Volatile

Authentication error: None

IP information (total 1 IPs):

         1: 10.10.110.82     Role: All (SDS and SDC)

        Port: 7072

RAM Read Cache information:

        128.0 MB (131072 KB) total size

        Cache is enabled

        RAM Read Cache memory allocation state is PENDING

Rfcache enabled

Device information (total 3 devices):

         1: Name: ScaleIO-1990ad5f  Path: /dev/sdb  Original-path: /dev/sdb  ID: f73f261500090000

                Storage Pool: scaleio_pool_ssd01, Capacity: 892 GB Error-fixes: 0 scanned 0 MB, Compare errors: 0 State: Normal

         2: Name: ScaleIO-1990ad60  Path: /dev/sdc  Original-path: /dev/sdc  ID: f73f261600090001

                Storage Pool: scaleio_pool_ssd01, Capacity: 892 GB Error-fixes: 0 scanned 0 MB, Compare errors: 0 State: Normal

         3: Name: ScaleIO-1990ad61  Path: /dev/sdd  Original-path: /dev/sdd  ID: f73f261700090002

                Storage Pool: scaleio_pool_hdd01, Capacity: 1861 GB Error-fixes: 0 scanned 0 MB, Compare errors: 0 State: Normal

No devices use Rfcache

Membership-state: Joined; Connection-state: Connected; SDS-state: Normal; 0 devices with error; 0 Rfcache devices with errors

        3.6 TB (3646 GB) total capacity

        2.7 TB (2743 GB) unused capacity

        0 Bytes snapshots capacity

        900.0 GB (921600 MB) in-use capacity

        0 Bytes thin capacity

        0 Bytes unreachable-unused capacity

        0 active moving-in forward-rebuild jobs

        0 active moving-in backward-rebuild jobs

        0 active moving-in rebalance jobs

        0 active moving-out forward-rebuild jobs

        0 active moving-out backward-rebuild jobs

        0 active moving-out rebalance jobs

        0 pending moving-in forward-rebuild jobs

        0 pending moving-in backward-rebuild jobs

        0 pending moving-in rebalance jobs

        0 pending moving-out forward-rebuild jobs

        0 pending moving-out backward-rebuild jobs

        0 pending moving-out rebalance jobs

        0 Bytes decreased capacity

After change Critical Capacity Threshold from 90 to 98 percent rebalance was starting.

For properly add new disks to an existing storage pool through vCenter Plugin for ScaleIO need - disable rebalancing through ScaleIO GUI, add new disks to each node and enable rebalancing, right? Or somewhere there is mistakes?

Hi Amama,

No, if you simply add a new disk, ScaleIO will rebalance automatically, you don't have to disable/enable it. As I said before, if used capacity exceeds critical threshold, rebalance will not run - but that's special case, normally system will rebalance by itself.

Cheers,

Pawel

Pawel,

if i add one disk to the first server in the required storage pool, will the balancing process be started? To avoid damage of rebalancing between unequal number of disks in the cluster, what should be done?

If I add one disk to 5 servers, the rebalancing process will be started after adding the disk to the last server or after adding in first server?

My steps:

- add device to first server

rebalance (?)

- add device to second server after rebalance or immediately after adding first device?

Hi,

In order to balance without performance lose, always try to keep the same (or at least similar) number of disks in every SDS.

Rebalance will start once SDS recognizes a new disk, no point in waiting for each SDS - ScaleIO will rebalance again after another new device is added.

Cheers,

Pawel