Yes, that's still relevant. If you are going to mix different capacities of disks it might be worth either adjusting the weights all to the same and just accepting that you will never use the full 3TB, or partition the 3TB into 2 partitions and use the 1st 1TB as the main storage pool mixed with other 1TB OSD's and then use the 2nd 2TB partition as a low performance capacity pool.
From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Lindsay Mathieson Sent: 30 December 2014 00:06 To: ceph-users@lists.ceph.com Subject: Re: [ceph-users] Improving Performance with more OSD's? On Sun, 28 Dec 2014 04:08:03 PM Nick Fisk wrote: > This should give you a bit more performance. It's > much better to have lots of small disks rather than large multi-TB ones from > a performance perspective. So maybe look to see if you can get 500GB/1TB > drives cheap. Is this from the docs still relevant in this case? "A weight is the relative difference between device capacities. We recommend using 1.00 as the relative weight for a 1TB storage device. In such a scenario, a weight of 0.5 would represent approximately 500GB, and a weight of 3.00 would represent approximately 3TB" So I would have maybe 1 3TB and 2 * 1TB Kinda regret getting the 3TB drives now .... learning experience. -- Lindsay Nick Fisk Technical Support Engineer System Professional Ltd tel: 01825 830000 mob: 07711377522 fax: 01825 830001 mail: nick.f...@sys-pro.co.uk web: www.sys-pro.co.uk<http://www.sys-pro.co.uk> IT SUPPORT SERVICES | VIRTUALISATION | STORAGE | BACKUP AND DR | IT CONSULTING Registered Office: Wilderness Barns, Wilderness Lane, Hadlow Down, East Sussex, TN22 4HU Registered in England and Wales. Company Number: 04754200 Confidentiality: This e-mail and its attachments are intended for the above named only and may be confidential. If they have come to you in error you must take no action based on them, nor must you copy or show them to anyone; please reply to this e-mail and highlight the error. Security Warning: Please note that this e-mail has been created in the knowledge that Internet e-mail is not a 100% secure communications medium. We advise that you understand and observe this lack of security when e-mailing us. Viruses: Although we have taken steps to ensure that this e-mail and attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. Any views expressed in this e-mail message are those of the individual and not necessarily those of the company or any of its subsidiaries.
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