>>I discussed this with somebody frmo inktank. Had to search the >>mailinglist. It might be OK if you're working with enough replicas and UPS. >> >>I see no other option while working with SSDs - the only Option would be >>to be able to deaktivate the journal at all. But ceph does not support this.
Do you have a big difference with putting 1 journal by osd on each ssd drive ? another alternative can be (but indeed costly): - stec zeus ram ssd drive, around 2000$ for 8G (I have benched it around 100000 iops ;) - ddrdrive (http://www.ddrdrive.com/) (around 200000iops, don't know the price) - fusionio card (iodrive2, 360GB, around 3000€ , but they are 160GB model, maybe half the price) - maybe ocz talos, around 600€ for OCZ Talos 2 R 200 Go (don't have benched them, but spec say around 35000iops random) ----- Mail original ----- De: "Stefan Priebe - Profihost AG" <[email protected]> À: "Mark Nelson" <[email protected]> Cc: "Alexandre DERUMIER" <[email protected]>, "ceph-devel" <[email protected]>, "Mark Kampe" <[email protected]>, "Sébastien Han" <[email protected]> Envoyé: Jeudi 22 Novembre 2012 15:42:14 Objet: Re: RBD fio Performance concerns Am 22.11.2012 15:37, schrieb Mark Nelson: > I don't think we recommend tmpfs at all for anything other than playing > around. :) I discussed this with somebody frmo inktank. Had to search the mailinglist. It might be OK if you're working with enough replicas and UPS. I see no other option while working with SSDs - the only Option would be to be able to deaktivate the journal at all. But ceph does not support this. Stefan > On 11/22/2012 08:22 AM, Stefan Priebe - Profihost AG wrote: >> Hi, >> >> can someone from inktank comment this? Might be using /dev/ram0 with an >> fs on it be better than tmpfs as we can use dio? >> >> Greets, >> Stefan >> >>> ----- Mail original ----- >>> >>> De: "Stefan Priebe - Profihost AG" <[email protected]> >>> À: "Sébastien Han" <[email protected]> >>> Cc: "Mark Nelson" <[email protected]>, "Alexandre DERUMIER" >>> <[email protected]>, "ceph-devel" <[email protected]>, >>> "Mark Kampe" <[email protected]> >>> Envoyé: Jeudi 22 Novembre 2012 14:29:03 >>> Objet: Re: RBD fio Performance concerns >>> >>> Am 22.11.2012 14:22, schrieb Sébastien Han: >>>> And RAMDISK devices are too expensive. >>>> >>>> It would make sense in your infra, but yes they are really expensive. >>> >>> We need something like tmpfs - running in local memory but support dio. >>> >>> Stefan >>> > > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
