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800 gb lto4?
hello ppl,
i have a library which has ultirum3 and ultrium4 drives anyway if i label a lto4 volume and write data to it it has only the half capacity - 800 gb which is same as LTO3.
is there anything i am missing or am i having some strange or unsupported configuration?
networker server is a 7.4.4 on windows 2003
HCLBACKUP
150 Posts
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December 2nd, 2009 04:00
Your library has LTO3 and LTO4 drives. If you use LTO4 tape with LTO3 tape drive then it will not write more than 800GB. If your library supports then you can do a partition such that LTO3 drive could not access the LTO4 tape slots.
Otherwise you can get LTO3 drive replaced with LTO4.
ble1
14.3K Posts
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December 2nd, 2009 07:00
DavidLOverton
6 Posts
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December 2nd, 2009 12:00
800 gig is the native capacity for LTO4. Check for compression (most likely this is not enabled) The 1.6 TB is based on a 2:1 compression ration.
Good luck,
PeterBen
120 Posts
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December 3rd, 2009 00:00
of course the drives are LTO4
the LTO3 tapes show in the volume database as 800GB written and full
the same is for LTO4 tapes written in LTO4 drives
how do i check if the HW compression is on if the drives are FC connected to a Netapp?
ble1
14.3K Posts
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December 5th, 2009 07:00
NW doesn't know what your volume is type, but it assumes it is the same type as device. In your case, as you state, this is LTO4.
The only way to see how much really lands on your tape is to check volume summary in GUI, mminfo for tape and sum totalsize or grep daemon log for messages where NW says how mush have been written to tape before marked full.
If your device path ends up with a (for NetApp) you should use compression then.
PeterBen
120 Posts
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February 4th, 2010 06:00
i am little bit closer to resolution
the problem is that the netapp filer gives me only nrst4l device when autoscanned for devices but i would need to use nrst4a instead to be able to write with compression enabled.
HP Ultrium 4-SCSI
rst4l - rewind device, format is: LTO-2(ro)/3 2/400GB
nrst4l - no rewind device, format is: LTO-2(ro)/3 2/400GB
urst4l - unload/reload device, format is: LTO-2(ro)/3 2/400GB
rst4m - rewind device, format is: LTO-2(ro)/3 4/800GB cmp
nrst4m - no rewind device, format is: LTO-2(ro)/3 4/800GB cmp
urst4m - unload/reload device, format is: LTO-2(ro)/3 4/800GB cmp
rst4h - rewind device, format is: LTO-4 800GB
nrst4h - no rewind device, format is: LTO-4 800GB
urst4h - unload/reload device, format is: LTO-4 800GB
rst4a - rewind device, format is: LTO-4 1600GB cmp
nrst4a - no rewind device, format is: LTO-4 1600GB cmp
urst4a - unload/reload device, format is: LTO-4 1600GB cmp