That's not actually so unusual: http://techreport.com/review/26058/the-ssd-endurance-experiment-data-retention-after-600tb The manufacturers are pretty conservative with their ratings and warranties. ;) -Greg On Thu, Nov 27, 2014 at 2:41 AM Andrei Mikhailovsky <and...@arhont.com> wrote:
> Mark, if it is not too much trouble for you, could you please check the > wear level and the amount of writes done on your Intel 520 ssds? It would > be useful to check if they are at similar level of wear/writes as mine. > > I am feeling a bit sceptical that my ssds have done 6 times the guaranteed > amount of writes and are still at 95% health level. Looks very odd / > incorrect to me. > > Cheers > > -- > Andrei Mikhailovsky > Director > Arhont Information Security > > Web: http://www.arhont.com > http://www.wi-foo.com > Tel: +44 (0)870 4431337 > Fax: +44 (0)208 429 3111 > PGP: Key ID - 0x2B3438DE > PGP: Server - keyserver.pgp.com > > DISCLAIMER > > The information contained in this email is intended only for the use of > the person(s) to whom it is addressed and may be confidential or contain > legally privileged information. If you are not the intended recipient you > are hereby notified that any perusal, use, distribution, copying or > disclosure is strictly prohibited. If you have received this email in error > please immediately advise us by return email at and...@arhont.com and > delete and purge the email and any attachments without making a copy. > > > ------------------------------ > > *From: *"Mark Nelson" <mark.nel...@inktank.com> > *To: *"Andrei Mikhailovsky" <and...@arhont.com>, "Michael Kuriger" < > mk7...@yp.com> > *Cc: *"Mark Nelson" <mark.nel...@inktank.com>, ceph-users@lists.ceph.com > *Sent: *Tuesday, 25 November, 2014 9:30:18 PM > *Subject: *Re: [ceph-users] Tip of the week: don't use Intel 530 SSD's > for journals > > > > 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" <mk7...@yp.com> > > *To: *"Mark Nelson" <mark.nel...@inktank.com>, > ceph-users@lists.ceph.com > > *Sent: *Tuesday, 25 November, 2014 5:12:20 PM > > *Subject: *Re: [ceph-users] 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 > > mk7...@yp.com > > 818-649-7235 > > > > MikeKuriger (IM) > > > > > > > > > > On 11/25/14, 7:49 AM, "Mark Nelson" <mark.nel...@inktank.com> 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. > > >> > > >> > > >> > > >> _______________________________________________ > > >> ceph-users mailing list > > >> ceph-users@lists.ceph.com > > >> > > >> > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_listin > > >>fo.cgi_ceph-2Dusers-2Dceph.com > &d=AAICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1AamzLOS > > > >>ncm6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=xAjtZHPapVvnusxPYRk6BsgVfaL1ZLDaT > > >>ojJmuDFDpQ&s=F0CBA8T3LuTIhofIV4LGk-6CgC8KsPAu-7JgJ4jRm3I&e= > > >> > > > > > >_______________________________________________ > > >ceph-users mailing list > > >ceph-users@lists.ceph.com > > > > https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_listinf > > >o.cgi_ceph-2Dusers-2Dceph.com > &d=AAICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1AamzLOSnc > > > >m6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=xAjtZHPapVvnusxPYRk6BsgVfaL1ZLDaTojJ > > >muDFDpQ&s=F0CBA8T3LuTIhofIV4LGk-6CgC8KsPAu-7JgJ4jRm3I&e= > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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