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Date:      Mon, 14 Jan 2019 09:49:09 -0500
From:      Dan Langille <dan@langille.org>
To:        Ken Merry <ken@kdm.org>
Cc:        Scott Long <scottl@samsco.org>, freebsd-scsi@freebsd.org
Subject:   Re: Looking for PCI express SCSI diff card recommendations
Message-ID:  <3FEF849A-099E-49D7-A8F9-D7D0AA41A7B7@langille.org>
In-Reply-To: <36153F07-0FE2-4DD5-9BD9-EBD18F88FC10@kdm.org>
References:  <9D2ED808-CE43-41BE-9698-45F0D85843A7@langille.org> <9C8F819A-7B8F-46C8-90E7-BDD16C785BD8@samsco.org> <36153F07-0FE2-4DD5-9BD9-EBD18F88FC10@kdm.org>

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> On Jan 14, 2019, at 9:10 AM, Ken Merry <ken@kdm.org> wrote:
>=20
> So, if you=E2=80=99re interested in newer tape drives / libraries, the =
connection options are FC, SAS or (lately) RoCE.  The first two work =
fine, but I have yet to be able to test/qualify a RoCE drive with =
FreeBSD.  For FC, get a Qlogic board (up to 16Gb is supported now) or a =
16Gb or newer Emulex board.  Both drivers support FC-Tape.  I have had =
much more experience with the Qlogic driver, but the Emulex driver does =
seem to work fine.  For SAS, get an LSI/Broadcom 12Gb or 6Gb board.  =
They support TLR, which is the SAS equivalent of FC-Tape.
>=20
> The only current tape drive vendor is IBM, and you can get LTO (LTO-8 =
is the latest, 12TB/30TB per tape) or TS drives (TS1160 is the latest, =
20TB/50TB) from them.  TS only makes sense for people with a big =
enterprise budget.

In my case, this is for home use, where I have no budget for tape =
libraries. The units I have are all production-cast-offs via kind =
donations.  Mind you, I did buy a Digital TL891 back in 2006 and it =
still works.  Photo of that beast here: =
https://www.freebsddiary.org/digital-tl891.php =
<https://www.freebsddiary.org/digital-tl891.php>;  <--- that is the unit =
for which I wanted a new SCSI card, but now I think the easiest solution =
is to find another M/B (see below).

>=20
> I believe HP stopped making their own tape drives at LTO-6.  Anything =
HP-branded that is LTO-7 or newer is going to be an IBM drive under the =
hood.
>=20
> If you want a tape library, there are a number of options.  I know =
from copious experience (yes I work there) that Spectra Logic libraries =
work well with FreeBSD, and their support is good.  IBM should also work =
fine, and really, most libraries should work with FreeBSD without an =
issue.

I'm using a Dell TL4000 just now, connected via a SAS card (see below). =
The other two tape libraries are legacy use only, for older backups.

> If you want to use LTFS on FreeBSD, I ported IBM=E2=80=99s LTFS to =
FreeBSD:
>=20
> https://github.com/LinearTapeFileSystem/ltfs =
<https://github.com/LinearTapeFileSystem/ltfs>;
Wow, that's pretty nifty.  Thanks.

>=20
> You would need an IBM LTO-5 or newer tape drive.  LTFS is helpful, but =
keep in mind it isn=E2=80=99t a backup package in and of itself.  It =
doesn=E2=80=99t manage multiple tapes, it just gives you a filesystem on =
a tape.

I can see where that might be useful for restores.

> As for SCSI adapters, I have a several ahc(4) boards in a machine =
running FreeBSD/head and talking to SCSI and CD devices.  The driver =
seems to work fine.
>=20
> One thing to consider if you=E2=80=99re switching machines and looking =
at buying new hardware, is whether your current tape library is still =
sufficient for your needs in terms of speed and capacity.  Rather than =
putting the money towards an LVD to HVD converter, you could put it =
toward a new tape drive or library.

The tape library in question is a DLT-7000, and it not used for active =
backups. It is retained only for older backups.

Current backups are to an LTO-4 tape library, vis a SAS2308 (Avago =
Technologies / LSI) card. That is working well.

I do have one M/B which has an both PCI and PCIE slots. I think the =
easiest short term solution is to move both cards into a chassis with =
that M/B. No purchase necessary.

>=20
> Another thing to consider is using hard drives for backup.  That might =
work, depending on your requirements for durability and shelf life for =
the media.  I=E2=80=99m guessing that buying a number of enterprise SATA =
(or SAS) drives would probably be cheaper than buying even a used =
library, media and FC or SAS card.

I backup to disk first, then copy to tape later. Both steps are handled =
by Bacula, the backup package I'm using.

Thank you.

>=20
> Ken
> =E2=80=94
> Ken Merry
> ken@FreeBSD.ORG <mailto:ken@FreeBSD.ORG>
>=20
>=20
>=20
>> On Jan 13, 2019, at 5:27 PM, Scott Long <scottl@samsco.org =
<mailto:scottl@samsco.org>> wrote:
>>=20
>> Hi Dan,
>>=20
>> I don=E2=80=99t know of any PCI Express cards that do SCSI, much less =
HVD SCSI.  You might need to start looking at SAS or Fibre Channel for =
future tape drives.  Ken Merry would be a good person asl about those.
>>=20
>> Scott
>>=20
>>=20
>>> On Jan 13, 2019, at 3:22 PM, Dan Langille <dan@langille.org =
<mailto:dan@langille.org>> wrote:
>>>=20
>>> I have an existing SCSI differential PCI card which works. I want to =
consolidate
>>> some services into another chassis, so I am looking for a similar / =
equivalent card
>>> for a PCIE slot.
>>>=20
>>> This is a photo of the connector, showing the SCS symbol.  =
https://twitter.com/DLangille/status/1084566640887562240 =
<https://twitter.com/DLangille/status/1084566640887562240>; =
<https://twitter.com/DLangille/status/1084566640887562240 =
<https://twitter.com/DLangille/status/1084566640887562240>>;
>>>=20
>>> I am looking for help in locating a replacement. I do not know what =
to search for.
>>>=20
>>> I think that is a n HD68 connector, but I'm failing to find =
something on eBay.
>>>=20
>>> Guidance please, especially if you can think of a model number to =
search for.
>>>=20
>>> Thank you.
>>>=20
>>> --
>>> Dan Langille - BSDCan / PGCon
>>> dan@langille.org <mailto:dan@langille.org>
>>>=20
>>>=20
>>>=20
>>> _______________________________________________
>>> freebsd-scsi@freebsd.org mailing list
>>> https://lists.freebsd.org/mailman/listinfo/freebsd-scsi
>>> To unsubscribe, send any mail to =
"freebsd-scsi-unsubscribe@freebsd.org"
>>=20
>> _______________________________________________
>> freebsd-scsi@freebsd.org <mailto:freebsd-scsi@freebsd.org> mailing =
list
>> https://lists.freebsd.org/mailman/listinfo/freebsd-scsi =
<https://lists.freebsd.org/mailman/listinfo/freebsd-scsi>;
>> To unsubscribe, send any mail to =
"freebsd-scsi-unsubscribe@freebsd.org"
>=20


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