Alexei,
We are using DLT7000 (5-10 MB/sec depending on compression) drives which actually outperform the Sony AIT (3-7.8 MB/sec depending on compression). We are not quite seeing 2:1 compression, we get about 60GB compressed on each 35GB tape.
-Steve Gremban gremban@ti.com
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I would like to see AIT supported; we currently use DLT, but as our backup needs are approaching 300GB (well, as soon as I get my new filer), DLT is not cutting it (backup/restore times are too long). Also, the media is a huge problem (DLT's are not all too happy with a drop...).
I suspect that these additional drives will be supported eventually.
Alexei -----------------------------------------------------------------------
+--- In a previous state of mind, Steve Gremban gremban@msp.sc.ti.com wrote: | | We are using DLT7000 (5-10 MB/sec depending on compression) drives which | actually outperform the Sony AIT (3-7.8 MB/sec depending on compression). We are | not quite seeing 2:1 compression, we get about 60GB compressed on each 35GB | tape. |
That is good to hear. We currently use a DLT4700 stacker (but not hanging off the filer). It does ok. The main drawback with our current system (Alexandria) is that 2 of the 7 tapes are used for admin purposes.
My only other interest in AIT (at first I dismissed it) is that it is at the begining of it's life, whereas DLT is at or close to its end (ie: what is the next size DLT?; AIT has a growth path for the next several years).
An AIT (or mammoth or 4mm) library (carousel wheel stylr) takes up much less space than a equivalent DLT device. I can hang a Spectralogic library (4 drives, 40 cartridges) in the same spae my f540 filer takes. A DLT library of that size would have to be floor standing (at least the ones I have seem).
I would love to hang a Spectralogic library (such as the one described above) off of my filer. That would be quite nice...
Ok, separate issue:
Is anybody using NBMD?
If you are, are you using a library (stacker, jukebox, etc) on the filer? How is it working?
I am hoping that Legato may open the doors to this (at least open them more widely). Does NBMD care about what device it is controlling?
Just curious.
Thanks.
Alexei
On Fri, 13 Feb 1998, Steve Gremban wrote:
We are using DLT7000 (5-10 MB/sec depending on compression) drives which actually outperform the Sony AIT (3-7.8 MB/sec depending on compression).
Are you actually able to stream at 10MB/sec throughout the backup?
Brian,
Hooked to an F330 I am seeing about 2-3MB/second so hooking up a DLT7000 to one system in this case is overkill. I've never hooked one up to a 520 or 630, they may be able to drive it a little harder.
Since we have 21 Netapps I decided to centralize backup on a sun server and back up the Netapps using nfs over fddi. Using Veritas Netbackup I am able to multiplex multiple backup streams to the same tape drive and am getting around 8MB/sec throughput.
-Steve gremban@ti.com
Brian Tao wrote:
On Fri, 13 Feb 1998, Steve Gremban wrote:
We are using DLT7000 (5-10 MB/sec depending on compression) drives which actually outperform the Sony AIT (3-7.8 MB/sec depending on compression).
Are you actually able to stream at 10MB/sec throughout the backup?-- Brian Tao (BT300, taob@netcom.ca) "Though this be madness, yet there is method in't"
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Alexei Rodriguez -
Brian Tao -
Steve Gremban