FWIW, I've got Intel 520s in one of our test nodes at Inktank that has a
fair amount of data thrown at it and we haven't lost a drive in 2 years.
Having said that, I'd use higher write endurance drives in production,
especially with how much cheaper they are getting these days.
Mark
On 11/25/2014 03:25 PM, Andrei Mikhailovsky wrote:
Thanks for the advise!
I've checked a couple of my Intel 520s which I use for the osd journals
and have been using them for almost 2 years now.
I do not have a great deal of load though. Only have about 60vms or so
which have a general usage.
Disk 1:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
233 Media_Wearout_Indicator 0x0032 096 096 000 Old_age
Always - 0
225 Host_Writes_32MiB 0x0032 100 100 000 Old_age
Always - 5754781
Disk 2:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE
UPDATED WHEN_FAILED RAW_VALUE
233 Media_Wearout_Indicator 0x0032 095 095 000 Old_age
Always - 0
225 Host_Writes_32MiB 0x0032 100 100 000 Old_age
Always - 5697133
So, from what I can see, I still have 95 and 96 percent left on the
disks and they have done around 190 TeraBytes, which seems like a lot
for a consumer grade disk. Or maybe I am reading the data wrongly?
Thanks
Andrei
------------------------------------------------------------------------
*From: *"Michael Kuriger" <mk7193@xxxxxx>
*To: *"Mark Nelson" <mark.nelson@xxxxxxxxxxx>, ceph-users@xxxxxxxxxxxxxx
*Sent: *Tuesday, 25 November, 2014 5:12:20 PM
*Subject: *Re: Tip of the week: don't use Intel 530
SSD's for journals
My cluster is actually very fast without SSD drives. Thanks for the
advice!
Michael Kuriger
mk7193@xxxxxx
818-649-7235
MikeKuriger (IM)
On 11/25/14, 7:49 AM, "Mark Nelson" <mark.nelson@xxxxxxxxxxx> wrote:
>On 11/25/2014 09:41 AM, Erik Logtenberg wrote:
>> If you are like me, you have the journals for your OSD's with
rotating
>> media stored separately on an SSD. If you are even more like me, you
>> happen to use Intel 530 SSD's in some of your hosts. If so,
please do
>> check your S.M.A.R.T. statistics regularly, because these SSD's
really
>> can't cope with Ceph.
>>
>> Check out the media-wear graphs for the two Intel 530's in my
cluster.
>> As soon as those declining lines get down to 30% or so, they
need to be
>> replaced. That means less than half a year between purchase and
>> end-of-life :(
>>
>> Tip of the week, keep an eye on those statistics, don't let a
failing
>> SSD surprise you.
>
>This is really good advice, and it's not just the Intel 530s. Most
>consumer grade SSDs have pretty low write endurance. If you
mostly are
>doing reads from your cluster you may be OK, but if you have even
>moderately high write workloads and you care about avoiding OSD
downtime
>(which in a production cluster is pretty important though not usually
>100% critical), get high write endurance SSDs.
>
>Mark
>
>>
>> Erik.
>>
>>
>>
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