Re: SATA RAID

["ianh1000" <ianh1000@xxxxxxxxx>]

Hi Ho Yin

Not sure how much truth there is in the low frequency issue
mentioned but there is a big difference in the design of a SATA
style disk to a SCSI disk. When we first started selling SATA arrays
they had a suggested duty cycle of 8 hours a day, the engineering
tolerance of a SCSI disk is much tighter, they are designed to run
24x7. I think one issue with SATA is they run best on their side,
they are less reliable if installed flat ( or did I get that the
wrong way around?)

I probably have a presentation I can send you on this, just need to
check if it has any NDA material, mail me off list if you would like
this.

Regards
Ian

--- In ukha_d@xxxxxxx, "Ho yin Ng" <yahoogroups@h...>
wrote:
>
> Is this why I keep getting so many EIDE disk failures?
>
>
>
> Can anyone back up this persons claim?
>
>
>
> Ho yin
>
>
>
>   _____
>
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx] On
Behalf Of
> Mark Harrison (Groups)
> Sent: 17 December 2005 11:12
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] SATA RAID
>
>
>
> There's been a big discussion about these on another list I'm a
member
> of (Sussex Linux User Group).
>
> One of the posters made some interesting points about SATA drives,
which
> are probably relevant to many of us here. I don't claim to be able
to
> comment on the technical validity of what he's been saying (for
the day
> job, we use SCSI arrays), but the poster is an IT consultant
> specialising in this kind of thing (oh and has a 1Tb+ array at
home.)
>
> > Remember - you can't just stick lots of disks in an enclosure
> > if they're not designed for it.
> >
> > Hard Disk drives can handle high frequency vibrations without a
care
> > in the world, they're designed for it. However, they're not so
> > accustomed  to low frequency vibrations - the exact kind that a
> > large number of disks creates :
> >
> > This is one of the reason SCSI disks are so expensive - they're
> > designed to cope with LF vibrations generated when you put 3+
> > disks in one enclosure. That's also why you can get "SATA
RAID"
> > disks - they're designed for bulk use.
> >
> > Just remember - sticking a large number of cheap disks in a
single
> > enclosure can cause problems - if this is a mission critical
system, I
> > would consider SCSI disks, or if price is an issue, SATA RAID
disks.
>
> Regards,
>
> Mark
>
>
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