On 12/27/2014 02:32 AM, Lindsay Mathieson wrote:
I see a lot of people mount their xfs osd's with nobarrier for extra
performance, certainly it makes a huge difference to my small system.
However I don't do it as my understanding is this runs a risk of data
corruption in the event of power failu
On Mon, 29 Dec 2014 07:04:47 PM Mark Kirkwood wrote:
> > Thanks all, I'll definitely stick with nobarrier
>
> Maybe you meant to say *barrier* ?
Oops :) Yah
--
Lindsay
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ceph-users
On 29/12/14 02:46, Lindsay Mathieson wrote:
On Sat, 27 Dec 2014 09:41:19 PM you wrote:
I certainly wouldn't, I've seen utility power fail and the transfer
switch fail to transition to UPS strings. Had this happened to me with
nobarrier it would have been a very sad day.
I'd second that. In
On Sat, 27 Dec 2014 09:41:19 PM you wrote:
> > > I certainly wouldn't, I've seen utility power fail and the transfer
> > > switch fail to transition to UPS strings. Had this happened to me with
> > > nobarrier it would have been a very sad day.
> > >
> > >
> >
> >
> >
> > I'd second that. In addi
On Sun, 28 Dec 2014, Mark Kirkwood wrote:
> On 28/12/14 15:51, Kyle Bader wrote:
> > > do people consider a UPS + Shutdown procedures a suitable substitute?
> >
> > I certainly wouldn't, I've seen utility power fail and the transfer
> > switch fail to transition to UPS strings. Had this happened t
On 28/12/14 15:51, Kyle Bader wrote:
do people consider a UPS + Shutdown procedures a suitable substitute?
I certainly wouldn't, I've seen utility power fail and the transfer
switch fail to transition to UPS strings. Had this happened to me with
nobarrier it would have been a very sad day.
I
> do people consider a UPS + Shutdown procedures a suitable substitute?
I certainly wouldn't, I've seen utility power fail and the transfer
switch fail to transition to UPS strings. Had this happened to me with
nobarrier it would have been a very sad day.
--
Kyle Bader
_
On Sun, Dec 28, 2014 at 1:25 AM, Lindsay Mathieson
wrote:
> On Sat, 27 Dec 2014 06:02:32 PM you wrote:
>> Are you able to separate log with data in your setup and check the
>> difference?
>
> Do you mean putting the OSD journal on a separate disk? I have the journals on
> SSD partitions, which has
On Sat, 27 Dec 2014 06:02:32 PM you wrote:
> Are you able to separate log with data in your setup and check the
> difference?
Do you mean putting the OSD journal on a separate disk? I have the journals on
SSD partitions, which has helped a lot, previously I was getting 13 MB/s
Its not a good SS
On Sat, Dec 27, 2014 at 4:31 PM, Lindsay Mathieson
wrote:
> On Sat, 27 Dec 2014 04:59:51 PM you wrote:
>> Power supply means bigger capex and less redundancy, as the emergency
>> procedure in case of power failure is less deterministic than with
>> controlled battery-backed cache.
>
> Yes, the who
On Sat, 27 Dec 2014 04:59:51 PM you wrote:
> Power supply means bigger capex and less redundancy, as the emergency
> procedure in case of power failure is less deterministic than with
> controlled battery-backed cache.
Yes, the whole auto shut-down procedure is rather more complex and fragile
f
Power supply means bigger capex and less redundancy, as the emergency
procedure in case of power failure is less deterministic than with
controlled battery-backed cache. Cache battery is smaller and way more
predictable for a health measurements than a UPS (if passes internal
check, it will be *alw
On Sat, 27 Dec 2014 09:03:16 PM Mark Kirkwood wrote:
> Yep. If you have 'em plugged into a RAID/HBA card with a battery backup
> (that also disables their individual caches) then it is safe to use
> nobarrier, otherwise data corruption will result if the server
> experiences power loss.
Thanks
On 27/12/14 20:32, Lindsay Mathieson wrote:
I see a lot of people mount their xfs osd's with nobarrier for extra
performance, certainly it makes a huge difference to my small system.
However I don't do it as my understanding is this runs a risk of data
corruption in the event of power failure -
I see a lot of people mount their xfs osd's with nobarrier for extra
performance, certainly it makes a huge difference to my small system.
However I don't do it as my understanding is this runs a risk of data
corruption in the event of power failure - this is the case, even with ceph?
side not
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