Actually you can leave it to 0 for both
# SONY AIT-2
manufacturer=SONY model = "SDX-500C" {
can-bsr scsi2logical drive-buffering
timeout=800
long-timeout=14400
mode1 blocksize=0 density=0x00 # Block Size and Density
}
# SONY AIT-3
manufacturer=SONY model = "SDX-700C" {
can-bsr scsi2logical drive-buffering
timeout=800
long-timeout=14400
mode1 blocksize=0 density=0x00 # as close as possible to st.conf entry
I'm not sure if you have any AIT-2 drives but it sounds like you only have 2
AIT-3 drives. So just leave it at 0 and set the block size in NetWorker to:
NSR_DEV_BLOCK_SIZE_8MM_AIT_2=128 (or to whatever you want)
NSR_DEV_BLOCK_SIZE_8MM_AIT_3=128 (or to whatever you want)
export NSR_DEV_BLOCK_SIZE_8MM_AIT_2 NSR_DEV_BLOCK_SIZE_8MM_AIT_3
Then you should be good from here on out. Also check on that firmware too
as the AIT-3 drives had problems even mounting AIT-2 tapes.
Hope some of this info helps.
Chad Smykay, RHCE, LCNA
Systems Storage Administrator
Rackspace Managed Hosting (TM)
-----Original Message-----
From: Matt Temple [mailto:mht AT research.dfci.harvard DOT edu]
Sent: Monday, May 17, 2004 3:20 PM
To: Chad Smykay
Cc: 'Legato NetWorker discussion'
Subject: Re: [Networker] Tape positioning by record is disabled.
Please see additional response below vvvvvvvvvvvvvv
Chad Smykay wrote:
> Matt,
>
> We used to use AIT-2 and AIT-3 tapes and tape drives in combination
> with in our library and used to have issue. What we ended up doing
> was set the block size in both the ST driver and Networker to the
> exact same block size for each type of drives and tapes. Unless you
> are trying to use types of tapes or drives for a specific purpose i.e.
> faster restores then I would recommend setting them to both the same size.
>
> On a side note we did find that there was any issue with AIT-3 drive
> firmware not able to properly be backwards compatible with AIT-2 tapes.
>
> We are currently running AIT-3 firmware: 0201
>
> This is one of the most recent firmware's for AIT-3 drives.
>
> Regards,
>
>
>
>
> Chad Smykay, RHCE, LCNA
> Systems Storage Administrator
> Rackspace Managed Hosting (TM)
>
> -----Original Message-----
> From: Legato NetWorker discussion
> [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU] On Behalf Of Matt Temple
> Sent: Monday, May 17, 2004 2:14 PM
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] Tape positioning by record is disabled.
>
> All,
>
> After a frustrating process in which I had a tape drive that
> would label tapes that my other drives couldn't read, I chose to force the
> blocksize on my AIT-3 tapes to 192K. (I believed that was the handler
> default for AIT-3, is this wrong?)
>
> I tell Networker to use these block sizes in the startup:
>
> NSR_DEV_BLOCK_SIZE_8MM_AIT_3=192
> export NSR_DEV_BLOCK_SIZE_8MM_AIT_3
> NSR_DEV_BLOCK_SIZE_8MM_AIT_2=64
> export NSR_DEV_BLOCK_SIZE_8MM_AIT_2
>
> This result in the following messages:
>
> May 14 15:18:48 tapes logger: NetWorker media: (notice) setting (8mm
> AIT-2) block size to (64 KB)
> May 14 15:18:49 tapes logger: NetWorker media: (notice) setting (8mm
> AIT-3) block size to (192 KB)
>
>
> I run stinit and get kernel messages similar to:
>
> st2: Block limits 2 - 16777215 bytes.
>
> Since two of my drives will be getting only AIT-3 tapes, I set their
> block size to 192K through nwadmin.
>
> Checking with scanner, it looks like the block size is correctly set
> on the tapes I've produced.
>
> ======================================================
> When the tape is full and it's time to verify the media, I get the
> following:
>
> media notice: Volume "lnx57.0308" on device "/dev/nst1": Cannot decode
> block. Verify the device configuration. Tape positioning by record is
> disabled.
> Mon 12:08:38 media info: verification of volume "lnx57.0308", volid
> 162008460 succeeded.
>
> =======================================================
>
> I thought the "cannot decode block" message only came when you didn't
> run stinit and the tape simply used default 512-byte blocks.
>
> Can someone tell me if I'm getting a real error? Should I be labeling
> my tapes or defining my drives differently? What does "handler
> default" realy mean -- I think the documentation for it is thin.
>
>
>
Matt Temple
Chad,
Right now our stinit.def file looks like this:
# SONY AIT-3
manufacturer="SONY" model = "SDX-700C" { can-bsr scsi2logical
drive-buffering timeout=800 long-timeout=14400
mode1 blocksize=0 density=0x00 }
Are you suggesting I should change it to:
# SONY AIT-3
manufacturer="SONY" model = "SDX-700C" { can-bsr scsi2logical
drive-buffering timeout=800 long-timeout=14400
mode1 blocksize=196608 density=0x32 }
Matt Temple
--
=============================================================
Matthew Temple Tel: 617/632-2597
Director, Research Computing Fax: 617/582-7820
Dana-Farber Cancer Institute mht AT research.dfci.harvard DOT edu
44 Binney Street, LG300/300 http://research.dfci.harvard.edu
Boston, MA 02115 Choice is the Choice!
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