RocksDB with SSD journal 3/30/300 rule

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G’Day everyone.

 

I’m about to try my first OSD’s with a split data drive and journal on an SSD using some Intel S3500 600GB SSD’s I have spare from a previous project. Now I would like to make sure that the 300GB journal fits but my question is whether that 300GB is 300 * 1000 or 300 * 1024? The reason is that I would like to partition the SSD into two to support two OSD’s however if it is 1024 then it won’t fit on the 600GB disk.

Interestingly parted tells me I have two 300GB partitions while fdisk tells me I only have 279.5G partitions.

 

fdisk /dev/sdb

Command (m for help): p

Disk /dev/sdb: 558.9 GiB, 600127266816 bytes, 1172123568 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: 4E3D8587-C8D8-2941-CC38-B8EB7C66264D

 

Device         Start        End   Sectors   Size Type

/dev/sdb1       2048  586061823 586059776 279.5G Linux filesystem

/dev/sdb2  586061824 1172121599 586059776 279.5G Linux filesystem

 

Command (m for help): q

 

parted /dev/sdb

GNU Parted 3.2

Using /dev/sdb

(parted) p

Model: ATA INTEL SSDSC2BB60 (scsi)

Disk /dev/sdb: 600GB

Sector size (logical/physical): 512B/512B

Partition Table: gpt

Disk Flags:

 

Number  Start   End    Size   File system  Name     Flags

1      1049kB  300GB  300GB               primary

2      300GB   600GB  300GB               primary

 

Thanks.

 

Regards

Robert Ruge

 


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