Thin Provisioning Function Support

AI Tools

Thin Provisioning (TP) operates by allocating disk storage space in a flexible manner among multiple devices, based on the minimum space required by each volume at any given time.

Test Case

On the Lightbits server, check the total free physical capacity of storage.
Create volumes, in which the total logical size is bigger than the free physical size of storage.
Prove that each client can allocate volumes that exceed the total physical capacity of the resource pool.
Connect these volumes on the client side (reflected as a new namespace on the client side), and use FIO to test that they work properly.
On the Lightbits server, check the freePhysicalStorage capacity parameter, to find out how much free storage capacity is available: $ lbcli get cluster -o json

root@lightos-server00:~ lbcli get cluster -o json { "UUID": "2ac0b5f1-e332-4526-9799-e5cec2208837", "subsystemNQN": "nqn.2016-01.com.lightbitslabs:uuid:1fa41a41-cf47-4ebd-b0f4-babda5fe322c", "currentMaxReplicas": 3, "supportedMaxReplicas": 3, "statistics": { "installedPhysicalStorage": "40007795470848", "managedPhysicalStorage": "38005951500288", "effectivePhysicalStorage": "27844312999526", "logicalStorage": "85899345920", "logicalUsedStorage": "0", "physicalUsedStorage": "0", "physicalUsedStorageIncludingParity ": "0", "** freePhysicalStorage **": "**27844312999526**", "estimatedFreeLogicalStorage": "27844312999526", "estimatedLogicalStorage": "27844312999526", "compressionRatio": 1

In this example, we have 27.8 terabytes physically available, which means that you can create a total of X terabytes of logical volumes.

Run a simple ‘for’ loop in order to create a few volumes, whose total capacity are greater than the ‘freePhysicalStorage’ parameter. In this example, we will create six volumes of 12 Tib each; 6x12=72 Terabytes.

for i in {1..5} ; do lbcli create volume --size="12 Tib" --name=vol$i --acl="acl3" --replica-count=1 --project-name=default; done

Sample Output

root@lightos-server00:~ for i in {1..5}; do lbcli create volume --size="12 Tib" --name=vol$i --acl="acl5" --replica-count=1 --project-name=default; done Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol0 362accb5-5918-4531-a4d5-bc9a4b957244 Creating Unknown 0 12 TiB 1 false values:"acl5" Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol1 eee903b2-da24-4715-81b7-0da49ffd03e4 Creating Unknown 0 12 TiB 1 false values:"acl5" Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol2 62ded229-eef0-4b8a-9281-11077be592a6 Creating Unknown 0 12 TiB 1 false values:"acl5" Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol3 24abc673-3c8e-4b08-adfa-aed18e408f51 Creating Unknown 0 12 TiB 1 false values:"acl5" Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol4 a8a1af43-5b55-461e-b08d-29320a6993ed Creating Unknown 0 12 TiB 1 false values:"acl5" Name UUID State Protection State NSID Size Replicas Compression ACL Rebuild Progress vol5 2d3fa8df-b6d8-491a-95ed-78d20d1cd940 Creating Unknown 0 12 TiB 1 false values:"acl5"

From the client server, connect to the newly-created volumes and check that six new NVME devices of 12 Tib each are attached, with lsblk:

root@lightos-server00:~ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT nvme0n1 259:1 0 50G 0 disk nvme0n8 259:20 0 12T 0 disk nvme0n6 259:16 0 12T 0 disk nvme0n4 259:13 0 12T 0 disk nvme0n2 259:3 0 30G 0 disk nvme0n7 259:18 0 12T 0 disk sda 8:0 0 111.8G 0 disk |-sda2 8:2 0 1G 0 part /boot |-sda3 8:3 0 110.8G 0 part | |-inaugurator--v2-osmosis--cache 253:1 0 30G 0 lvm | |-inaugurator--v2-root 253:2 0 58.2G 0 lvm / | `-inaugurator--v2-swap 253:0 0 8G 0 lvm [SWAP]` sda1 8:1 0 2M 0 part nvme0n5 259:14 0 12T 0 disk nvme0n3 259:7 0 12T 0 disk

Run random FIO tests on the volumes and check performance:

Make sure you have FIO installed. If not: $ yum install fio -y
With lshw, double-check the num of CPUs and apply accordingly, on numjobs=32 cpus_allowed=0-31 in the FIO file.

Sample FIO file:

root@rack03-server64:~ cat fio_lightOS.fio [global] ramp_time=0 rw=randwrite #rwmixread =100 # When using randrw in the line above refill_buffers loops=1 buffer_compress_percentage=50 buffer_compress_chunk=4096 direct=1 norandommap=1 time_based cpus_allowed_policy=split log_avg_msec=1000 numjobs=12 cpus_allowed=0-11 iodepth=32 randrepeat=0 ioengine=libaio group_reporting=1 runtime=300 bs=4k [job_1] filename=/dev/nvme0n5:/dev/nvme0n8:/dev/nvme0n4 # Device paths for Lightbits volumes

Last updated on

Was this page helpful?