Onstream DI30 software for backup.

[Alexios Chouchoulas]

On Thu, 19 Jul 2001, Nikos Ladis wrote:

>               Gnorizei kaneis kapoia GUI simvati efarmogi gia backup meso 
> onstream EIDE DI30 siskevi ? 

[meta apo diabasma tou ypoloipou thread]

An skopeveis na afhseis end-user [1] na krataei backup, den arkei na
skefteis mono to texniko zhthma, oute ths euxrhstias, alla ki ena parapanw:
poso kairo tha parei mexri na stamathsei na krataei backup (baremara,
yperbolikh empistosynh sto hardware, klp).

Ola ta GUI front-ends gia backup exoun afto to koino: kapoios prepei na ta
ksekinhsei, na ta epiblepsei, klp.

Den kserw leptomereies gia to DI30, alla an to megalytero partition sou
xwraei (pithanws sympiesmeno) mesa se *ena* cartridge, dokimase na
egkatasthseis Amanda [2]. To programma trexei sto backgroud, kai h monh
ypoxrewsh tou xeiristh einai na koitaei to email tou mia fora th mera kai na
bazei sto drive thn aparaithth tainia (h tainies).

Aparaithth proypothesi einai na doulevei to drive sto Linux, dhladh na exeis
kapoiou eidous character device pou epitrepei *non-rewinding* prosbash sth
syskevh [3]. Apo thn xrysh epoxh twn 9-track tape drives kai meta, ola ta
tape devices to yposthrizoun afto. An to Linux mporei na dei th syskevh,
tote h Amanda mporei na th xrhsimopoihsei. Den exei shmasia an einai SCSI,
ATAPI, klp klp. Symferei fysika na parexei to sxetiko ioctl() API gia na
doulevei to mt(1), alla den einai ypoxrewtiko -- apla diefkolynei to
xeiristh.

To basikotero kalo einai oti an gia opoiodhpote logo o xeirisths ksexasei na
balei thn kaseta, balei th lathos kaseta, klp klp, h Amanda kanei graceful
recovery analoga me thn periptwsh (krataei ta backups se proswrino directory
sto disko, an to epitrepeis afto).

Sto edw diktyo o server ths Amanda trexei sto dumphost mas, ena Sun SS5
m'ena 8mm drive twn 5G. Kathe brady krataei backups oloklhrou tou diktyou
(synolika 3-7 mhxanes, analoga to poses einai anammenes, syndedemenes klp)
kai typwnei kai tampelakia gia tis tainies ston ektypwth. :-)

Btw, sxetika me ta kernel drivers ths syskevhs sou, na ti leei to
/usr/src/linux-2.4.6/drivers/ide/ide-tape.c:

* Ver 1.17  Nov 2000 / Jan 2001  Marcel Mol, marcel at mesa.nl 
*                      - Add idetape_onstream_mode_sense_tape_parameter_page 
*                        function to get tape capacity in frames: tape->capacity.
*                      - Add support for DI-50 drives( or any DI- drive). 

Genika deixnei elpidoforo...


> Sto site tis onstream kai sta pdf documentations pou ehei apla anaferei oti 
> einai compatible me linux native applications.  ( ta opoia den anakalipsa 
> akoma ) :-)

$ cat <<EOF |dd conv=sync of=/dev/ht0 obs=32k
Eimai mia mikrh dokimh.
Pws na kataxrasteite to tape drive sas se 69 apla mathimata.
^D
0+1 records in
0+1 records out
$ _

  An afto doulepsei, tote molis anakalypses poies einai oi "native
applications". :-)  Mia kalh syllogh:

                          cat, echo, dd, tar, dump

  Ola t'alla basizontai s'afta. :-)

A.

PS: An exeis thn epilogh, pote ma pote mhn agorazeis:

  (a) USB tapes
  (b) ATAPI tapes
  (c) Shugart (Floppy interface) tapes
  (d) Proprietary interface tapes
  (e) O,tidhpote syndeetai se VAX 11/7xx.

  Gia sobares efarmoges, pairne SCSI tapes. Ta synistoun 29 kataskevastes
plynthriwn.

[1] s/end-/l/g

[2] http://www.amanda.org/ 

[3] Dhladh den kanei rewind thn kaseta afou kleiseis to device.

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