[ceph-users] Drive for Wal and Db

solarflow99 solarflow99 at gmail.com
Mon Oct 22 15:55:06 PDT 2018


Why didn't you just install the DB + WAL on the NVMe?  Is this "data disk"
still an ssd?



On Mon, Oct 22, 2018 at 3:34 PM David Turner <drakonstein at gmail.com> wrote:

> And by the data disk I mean that I didn't specify a location for the DB
> partition.
>
> On Mon, Oct 22, 2018 at 4:06 PM David Turner <drakonstein at gmail.com>
> wrote:
>
>> Track down where it says they point to?  Does it match what you expect?
>> It does for me.  I have my DB on my data disk and my WAL on a separate NVMe.
>>
>> On Mon, Oct 22, 2018 at 3:21 PM Robert Stanford <rstanford8896 at gmail.com>
>> wrote:
>>
>>>
>>>  David - is it ensured that wal and db both live where the symlink
>>> block.db points?  I assumed that was a symlink for the db, but necessarily
>>> for the wal, because it can live in a place different than the db.
>>>
>>> On Mon, Oct 22, 2018 at 2:18 PM David Turner <drakonstein at gmail.com>
>>> wrote:
>>>
>>>> You can always just go to /var/lib/ceph/osd/ceph-{osd-num}/ and look at
>>>> where the symlinks for block and block.wal point to.
>>>>
>>>> On Mon, Oct 22, 2018 at 12:29 PM Robert Stanford <
>>>> rstanford8896 at gmail.com> wrote:
>>>>
>>>>>
>>>>>  That's what they say, however I did exactly this and my cluster
>>>>> utilization is higher than the total pool utilization by about the number
>>>>> of OSDs * wal size.  I want to verify that the wal is on the SSDs too but
>>>>> I've asked here and no one seems to know a way to verify this.  Do you?
>>>>>
>>>>>  Thank you, R
>>>>>
>>>>> On Mon, Oct 22, 2018 at 5:22 AM Maged Mokhtar <mmokhtar at petasan.org>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>> If you specify a db on ssd and data on hdd and not explicitly specify
>>>>>> a
>>>>>> device for wal, wal will be placed on same ssd partition with db.
>>>>>> Placing only wal on ssd or creating separate devices for wal and db
>>>>>> are
>>>>>> less common setups.
>>>>>>
>>>>>> /Maged
>>>>>>
>>>>>> On 22/10/18 09:03, Fyodor Ustinov wrote:
>>>>>> > Hi!
>>>>>> >
>>>>>> > For sharing SSD between WAL and DB what should be placed on SSD?
>>>>>> WAL or DB?
>>>>>> >
>>>>>> > ----- Original Message -----
>>>>>> > From: "Maged Mokhtar" <mmokhtar at petasan.org>
>>>>>> > To: "ceph-users" <ceph-users at lists.ceph.com>
>>>>>> > Sent: Saturday, 20 October, 2018 20:05:44
>>>>>> > Subject: Re: [ceph-users] Drive for Wal and Db
>>>>>> >
>>>>>> > On 20/10/18 18:57, Robert Stanford wrote:
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> >
>>>>>> > Our OSDs are BlueStore and are on regular hard drives. Each OSD has
>>>>>> a partition on an SSD for its DB. Wal is on the regular hard drives. Should
>>>>>> I move the wal to share the SSD with the DB?
>>>>>> >
>>>>>> > Regards
>>>>>> > R
>>>>>> >
>>>>>> >
>>>>>> > _______________________________________________
>>>>>> > ceph-users mailing list [ mailto:ceph-users at lists.ceph.com |
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>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com |
>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ]
>>>>>> >
>>>>>> > you should put wal on the faster device, wal and db could share the
>>>>>> same ssd partition,
>>>>>> >
>>>>>> > Maged
>>>>>> >
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