[PVE-User] Ceph journal partition alignment

[Eneko Lacunza]

Hi again,

Responding to myself, from intel docs:
http://www.intel.com/content/www/us/en/solid-state-drives/ssd-partition-alignment-tech-brief.html

"Intel SSDs have different page sizes depending on the model, but the 
current Intel Datacenter SSDs have 8 KB and 16KB pages. These pages are 
then organized into
blocks."

The doc then continues to recommend a 4KB filesystem alignment, and 1M 
partition aligment.

Now, so this doesn't happen "by default", I'm willing to make some tests 
to try to reproduce this and report where it belongs. If I recall 
correctly, Proxmox is using ceph tools for provisioning the OSDs?

Thanks
Eneko

El 04/08/16 a las 09:25, Eneko Lacunza escribió:
> Hi all,
>
> We have recently installed a new node for our office cluster. This 
> node has an Intel S3610 200GB disk for Proxmox and Ceph Journals, and 
> 4x1TB HDD (3x1Gbit network).
>
> Installation was made with Proxmox 4.2 ISO. I have noticed that 
> journal partitions (sde4-sde7) are not properly aligned?
>
> Size: 186.3 GiB, 200049647616 bytes, 390721968 sectors
> Label: gpt, identifier: CB415B43-CDF3-4D72-98BB-5A90367BD1FF
>
> Device          Start         End    Sectors    Size Type
>
> /dev/sde1          34        2047       2014   1007K BIOS boot
>
> /dev/sde2        2048      262143     260096    127M EFI System
>
> /dev/sde3      262144   125829120  125566977   59.9G Linux LVM
>
> /dev/sde4   125829122   136314881   10485760      5G unknown
>
> /dev/sde5   136314882   146800641   10485760      5G unknown
>
> /dev/sde6   146800642   157286401   10485760      5G unknown
>
> /dev/sde7   157286402   167772161   10485760      5G unknown
>
> I think those partitions should be 1M/4M aligned? Should I bother at all?
>
> Thanks
> Eneko
>


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