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MICE-DISCUSS  March 2015

MICE-DISCUSS March 2015

Subject:

Re: FW: New gen route servers

From:

Anton Kapela <[log in to unmask]>

Reply-To:

MICE Discuss <[log in to unmask]>

Date:

Fri, 27 Mar 2015 07:13:12 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (48 lines)

(Chiming in because storage and OS nerding)

Given the use case (safety > perf), perhaps the route server storage would be best matched by something like a sync-mounted file system, raid1 with no cache enabled, or read cache only with a forced write-through? 

A pair of SLC-type SSD's with ext3/4, or XFS mounted 'sync' atop a write-through raid1 should still be entirely awesome and performant for the job of booting an OS and loading route-server binaries, and perhaps even soaking up a few syslog outputs...while being as 'safe' as the hardware allows. 

If that sounds tempting, tell me where to fedex the ssd media & caddy adapters :)

-Tk

> On Mar 27, 2015, at 1:26 AM, Doug McIntyre <[log in to unmask]> wrote:
> 
>> On Thu, Mar 26, 2015 at 06:24:03PM -0500, Brady Kittel wrote:
>> As an alternate option I have several HP dl380 g7's that are maybe a year
>> old and still under warranty I could provide. They have licensed ILO on
>> them as well and I could provide some hot spare drives for them.
> 
> I think with the current PE R320 and PE R805, that we are probably set, but
> thank you for your offer. The R320 is a pretty new box, hmm, pulling the
> serial # and going to Dell, it looks like it is only 16 months old. Jeff
> mentioned they had some more coming out of cycle, and that people were looking
> to get a hot spare at the UG meeting? 
> 
> I think the specific problem I was seeing with the old hardware was
> due to a very specific configuration. With the PERC6/i battery backed
> up RAID controller, and some combination due to the age of the battery, 
> and that specific design, which periodically (every 2-3 months or so) does
> a deep drain and charge cycle on the battery to make sure it can hold its'
> intended charge for the writeback log, during this cycle it switches the
> writeback log off and then on again, and sometimes the OS glitches on this
> sudden change in disk latency. My guess is the batteries were below a certain
> threshold point that exacerbated the writelog switchover, since we have been
> running on the same hardware for quite some time without issues, but not
> below the threshold which would alert the BCM on the RAID battery being bad.
> 
> Both of these new systems do not have a battery backed up RAID system, which
> really isn't needed in this use case anyway, and are newer hardware, which I 
> think would serve us well. 
> 
> I have both inhouse, with the OS installed, I just have to copy the configs back over,
> which I can get done pretty quickly, as it isn't extensive, and haul them down
> to 511. I'll have to schedule up some sort of switchout time, how much lead time 
> would a graceful changeout of the hardware be required? 
> 
> -- 
> Doug McIntyre                            <[log in to unmask]>
>                    ~.~ ipHouse ~.~
>       Network Engineer/Provisioning/Jack of all Trades

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