linuxaudio.org

On Tue, 02 Nov 2010 20:12:26 +0100

Benjamin Freitag  wrote:

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> Hey, linux machines dont crash as long as your proggies are compiled n

> programmed correctly.

BWAHAHAHAHAHAAAAAAAAAAAAAA!!!!!
They're computers.  They're going to crash.  Mine do so very infrequently,

but sometimes they do.
> And why is the drummer sitting next to the UPS and you didnt tell him he

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> IS THERE FOR DRUMMING, not manipulating your systems?

The drummer was wandering around on a break.  I have no idea what made him

push that button.  When I asked him why the holy hell he'd done that, he

shrugged and said "I dunno, I wanted to see what it did."  My response was that

it just added $25 to his band's session because I had to reboot the systems

and fsck the drives.  (I didn't *need* to, but 1) better safe than sorry and

2) consider it a stupidity tax.)  He even had to reach down and under the

desk to push it.
> > So can bad RAM and/or bad hard drives.  In my experience SSDs are now no

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> > more or less prone to problems than any other part of the computer.  Backups

> > should be approached like voting in Chicago - early and often!

> >

> And "in your experience" is how many years?

Let's see, 23 years as a UNIX (and later Linux) admin in high-availability

environments, and now a year as a QA engineer at a storage company.
> The 1.000.000 hrs MTBF is calculated when running 1000 drives for 1000

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> hrs and one starts to fail,

> so every 1000 customers it may happen. Yes wear level algorithms became

> better, and yes it all becomes better, but  still the testing time was

> too low for final statements.

What I'm seeing is a significant reduction in the amount of failures in SSDs

than I saw 2-3 years ago, where an EMC storage system that had been fitted with

32 SSDs (in addition to 100 or so magnetic drives) would lose 2-3 of them each

month.  By the time I left, the drives had all been replaced with newer generation

SSDs and the failure rate went down significantly - I only had to have one

replaced in the last 4 months I worked there.
Throw as many MBTF numbers that you want around; the first gen SSDs did not

come close to those manufacturer estimates.
> >> For the money of two cheap SSD(needed for solid performance)

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> >     . . .

> > I do agree that having 2 mirrored drives is more secure, though.

> >

> Not secure, i mean speed, ssds still go down in read/write speeds when

> you have fragmented disks

Fragmentation can be an issue, but I guess I don't see how 2 drives

alleviates that problem.  If they're mirrored, you're still writing all data

to the drives in the order it comes in.  You need at least 3 drives for parity

RAID like RAID5 (which is evil anyway), so I'm missing how having a pair of

SSDs decreases fragmentation.  Even if I'm writing to multiple files at a

time (such as recording 16 tracks at once with Ardour), the written blocks are

not so spread out that fragmentation would be a major issue for playback, and

overdubs would tend to be even less fragmented since there are fewer tracks

written.
> Security only comes by Backups.
Indeed.  
> I love SSDs when recording in live venues, because heavy low subs WILL

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> kill HDs sooner or later.

Interesting, but it makes sense.
> I hate my G.Skill with JMF602b because it had a short circuit via

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> USB(faulty port on the disk ) and now all e-mails, bills etc are lost.

Sorry to hear that - I'm particularly careful with my data.  I back up each of

my machines nightly to a central server, and the backup partition (which is on

a mirrored pair of drives) is then backed up to an external drive.  I've never

lost any data, which would be extremely embarrassing, since I'm always preaching

about backups to my clients and employers!  I assume all hardware is crap and

will break sooner ratehr than later!  Or, plan for the worst and hope for the best.
--

======================================================================

       Joe Hartley - UNIX/network Consultant - jh@brainiac.com

 Without deviation from the norm, "progress" is not possible. - FZappa

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