SAS and SATA (arrays) on one controller (LSISAS1068)?

LSI doesn't recommend this and warns against possible
data inconsistencies/losses. No further reason given
(or at least I didn't find it in their web pages).

Nevertheless, did anybody out there try this? Results?

--
Michael Giegerich

"Michael Giegerich" <migieger@web.de> wrote in message news:huit0f.kc32.ln@luva.dyndns.org
> LSI doesn't recommend this and warns against possible
> data inconsistencies/losses. No further reason given
> (or at least I didn't find it in their web pages).

Sounds like they made a lemon and still try to sell it without fixing it.
If it wasn't designed to be able to do this then it simply wouldn't let
you do it.

>
> Nevertheless, did anybody out there try this? Results?

>"Michael Giegerich" <migieger@web.de> wrote in message
>news:huit0f.kc32.ln@luva.dyndns.org...
>
> LSI doesn't recommend this and warns against possible
> data inconsistencies/losses. No further reason given
> (or at least I didn't find it in their web pages).

How was it worded? Were they just warning people not to do something
obviously dumb like combining SAS and SATA drives into the same array?

If they are saying not to have a SAS array and a separate SATA array on the
same controller then I agree with Frank

John L Rice

John L Rice:
> >"Michael Giegerich" <migieger@web.de> wrote in message
> >news:huit0f.kc32.ln@luva.dyndns.org...
> >
> > LSI doesn't recommend this and warns against possible
> > data inconsistencies/losses. No further reason given
> > (or at least I didn't find it in their web pages).
>
> How was it worded? Were they just warning people not to do something
> obviously dumb like combining SAS and SATA drives into the same array?
>
> If they are saying not to have a SAS array and a separate SATA array on the
> same controller then I agree with Frank

This one.

--
Michael Giegerich

In article <0ksi1f.2e31.ln@luva.dyndns.org>, migieger@web.de says...
>
>John L Rice:
>> >"Michael Giegerich" <migieger@web.de> wrote in message
>> >news:huit0f.kc32.ln@luva.dyndns.org...
>> >
>> > LSI doesn't recommend this and warns against possible
>> > data inconsistencies/losses. No further reason given
>> > (or at least I didn't find it in their web pages).
>>
>> How was it worded? Were they just warning people not to do something
>> obviously dumb like combining SAS and SATA drives into the same array?
>>
>> If they are saying not to have a SAS array and a separate SATA array on the
>> same controller then I agree with Frank
>
it's actually due to the difference in rotational vibration that you're
not supposed to put both SAS & SATA drivers into the same array
_____ . .
' \\ . . |>>
O// . . |
\_\ . . |
| | . . . |
/ | . www.EvenEnterprises.com . . . |
/ .| info@EvenEnterprises.com . . . |
/ . | 310-544-9439 / 310-544-9309 fax . . . o
----------------------------------------------------------------------
Authorized - DIRECT VAR/VAD/Distributor for new mid-high end storage
iSCSI/NAS/SAN/RAID from EMC, HP, Equallogic, Quantum, OverLand Storage

Andy:
> In article <0ksi1f.2e31.ln@luva.dyndns.org>, migieger@web.de says...
> >
> >John L Rice:
> >> >"Michael Giegerich" <migieger@web.de> wrote in message
> >> >news:huit0f.kc32.ln@luva.dyndns.org...
> >> >
> >> > LSI doesn't recommend this and warns against possible
> >> > data inconsistencies/losses. No further reason given
> >> > (or at least I didn't find it in their web pages).
> >>
> >> How was it worded? Were they just warning people not to do something
> >> obviously dumb like combining SAS and SATA drives into the same array?
> >>
> >> If they are saying not to have a SAS array and a separate SATA array on the
> >> same controller then I agree with Frank
> >
> it's actually due to the difference in rotational vibration that you're
> not supposed to put both SAS & SATA drivers into the same array

Because a SCSI drive rotating at 15,000 rpm
would harm a SATA drive at 7,200 rpm?

Then it should be advised against to mix SATA
and SCSI drives on the same controller or even
in the same computer housing... :-)

Honestly, why would this be a reason?

--
Michael Giegerich

Michael Giegerich wrote:

> Because a SCSI drive rotating at 15,000 rpm
> would harm a SATA drive at 7,200 rpm?
>
> Then it should be advised against to mix SATA
> and SCSI drives on the same controller or even
> in the same computer housing... :-)
>
> Honestly, why would this be a reason?
>

I don't know if this is the reason, but mechanical systems tend to
resonate. If, for example, you put a bunch of similar pendulum clocks
in a room, after a while all will have the same period.

Generators will sync together, motors will run at the same speed.

I can see that having a 7200 RPM and 15000 RPM motor in close proximity,
especially in a computer case which vibrates, could cause problems...

So I agree with you, it's weird but I can see the sense.

Maybe it's lawyer-ese for "If the drives fail and they're not on the
same controller, you can't blame us. If they're on the same controller,
you can blame us." :-|

"John L Rice" <Drummer@ImJohn.com> wrote in message news:133pqc48polauc1@corp.supernews.com
> > "Michael Giegerich" <migieger@web.de> wrote in message news:huit0f.kc32.ln@luva.dyndns.org...
> >
> > LSI doesn't recommend this and warns against possible
> > data inconsistencies/losses. No further reason given
> > (or at least I didn't find it in their web pages).
>
> How was it worded? Were they just warning people not to do something

> obviously dumb

Nonsense.

> like combining SAS and SATA drives into the same array?

There is nothing obviously dumb about it.

>
> If they are saying not to have a SAS array and a separate SATA array on the
> same controller then I agree with

> Frank.

Who?

>
> John L Rice

Do your brain****s happen often?

"Andy" <info@evenenterprises.com> wrote in message news:i710i.74420$Fk2.38096@newsfe08.phx
> In article <0ksi1f.2e31.ln@luva.dyndns.org>, migieger@web.de says...
> > John L Rice:
> > > > "Michael Giegerich" migieger@web.de> wrote in message news:huit0f.kc32.ln@luva.dyndns.org...
> > > >
> > > > LSI doesn't recommend this and warns against possible
> > > > data inconsistencies/losses. No further reason given
> > > > (or at least I didn't find it in their web pages).
> > >
> > > How was it worded? Were they just warning people not to do something
> > > obviously dumb like combining SAS and SATA drives into the same array?
> > >
> > > If they are saying not to have a SAS array and a separate SATA array on the
> > > same controller then I agree with Frank
>
> it's actually due to the difference in rotational vibration that you're
> not supposed to put both SAS & SATA drivers into the same array

But adding them as single drives outside an array would be fine.
Yup, that obviously makes sense.

> _____ . .
> ' \\ . . |>>
> O// . . |
> \_\ . . |
> | | . . . |
> / | . www.EvenEnterprises.com . . . |
> / .| info@EvenEnterprises.com . . . |
> / . | 310-544-9439 / 310-544-9309 fax . . . o
> ----------------------------------------------------------------------
> Authorized - DIRECT VAR/VAD/Distributor for new mid-high end storage
> iSCSI/NAS/SAN/RAID from EMC, HP, Equallogic, Quantum, OverLand Storage

Here's another store to avoid. Thanks for the warning.

Michael Giegerich <migieger@web.de> kenjka:
> LSI doesn't recommend this and warns against possible
> data inconsistencies/losses. No further reason given
> (or at least I didn't find it in their web pages).

SATA and SCSI/SAS drives spin in different direction, that's the reason
why it's not recommended installing both type of drives in the same case...

Quotation:
Although SAS and SATA are compatible, Mike Karp of Enterprise Management
Associates cautions against mixing different drives in the same enclosure.

"Only put drives of the same speed in the same bay," he advises. "Devices
spinning at different speeds cause vibration, and there is a danger that
drives can unset or cause errors in reads and writes."

http://www.serverwatch.com/hreviews/article.php/3619016


--
"Bijesans li celavacu izdrkavu ?" upita Misko bulji Ficou pozdravlju.
"Nisam ja nikog bombardiro !" rece majoneza trci "Ja samo rostiljog ljubija blesavm !" By runf

Damir Lukic, calypso@_MAKNIOVO_fly.srk.fer.hr
a member of hr.comp.hardver FAQ-team