Can I have the users' opinions? The top statement was from an unnamed NetApp 740 filer user. The bottom part is NetApp's rebuttal. I see this as two questions. (1) can a 740 support two tape adapters? and (2) who is right(er) about NDMP backup speeds on a 740, with one tape drive adapter?
------------------------------------------------------------------------ ------------------------------- [USER]
With a (potentially) 1.4Tb filer, can it be backed up with two drives reasonable amount of time???? At 15gb/hr (conservative with NDMP), that's lots of hours to back em up..."
------------------------------------------------------------------------ ------------------------------ [NetApp] Two tape adapter support was certified (tested) only on the F760 and the F630. It was a matter of testing resources with our latest release.
Dump speeds run at up to 25 GB/hr with 1 dump and up to 45 GB/hr with two dumps to two tape drives on a single tape adapter.
fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.
-- michael
On Thu, Mar 25, Will Harper wrote:
Can I have the users' opinions? The top statement was from an unnamed NetApp 740 filer user. The bottom part is NetApp's rebuttal. I see this as two questions. (1) can a 740 support two tape adapters? and (2) who is right(er) about NDMP backup speeds on a 740, with one tape drive adapter?
[USER]With a (potentially) 1.4Tb filer, can it be backed up with two drives reasonable amount of time???? At 15gb/hr (conservative with NDMP), that's lots of hours to back em up..."
[NetApp]Two tape adapter support was certified (tested) only on the F760 and the F630. It was a matter of testing resources with our latest release.
Dump speeds run at up to 25 GB/hr with 1 dump and up to 45 GB/hr with two dumps to two tape drives on a single tape adapter.
In message 19990325105303.A7088@avatar.lsd.ornl.gov, mgx@spruce.lsd.ornl.g ov writes:
fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.
-- michael
That sounds slow. We're readying an F740 for production and our tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to a Sun "backup server" with a DLT4000 jukebox. That's theoretical max on a DLT4000 and still plenty of room on the network. Haven't tried multiple concurrent dumps yet, so I'm not sure how well that would scale. You should see about triple the throughput to a single DLT7000.
jason
On Thu, Mar 25, Will Harper wrote:
Can I have the users' opinions? The top statement was from an unnamed NetApp 740 filer user. The bottom part is NetApp's rebuttal. I see this
as two questions. (1) can a 740 support two tape adapters? and (2) who i
s
right(er) about NDMP backup speeds on a 740, with one tape drive adapter?
[USER]With a (potentially) 1.4Tb filer, can it be backed up with two drives reasonable amount of time???? At 15gb/hr (conservative with NDMP), that's lots of hours to back em up..."
[NetApp]Two tape adapter support was certified (tested) only on the F760 and the F630. It was a matter of testing resources with our latest release.
Dump speeds run at up to 25 GB/hr with 1 dump and up to 45 GB/hr with two dumps to two tape drives on a single tape adapter.
i'd love to see 35-45GB/hour. the netapps are on a 100MB full-duplex lan. we're using budtool 4.5/ndmp and the tapedevice is nrst0a (70GB/compressed). this is what the netapp thinks about the tape drive/scsi adapter:
slot 2: SCSI Host Adapter 2 (QLogic ISP 1040B) Firmware Version 2.26 Clock Rate 60MHz. 4: QUANTUM DLT7000 1E48 In-Band Enclosure Services 0 Swap Events, 0 Enclosure Events
where is my problem i wonder?
-- michael
On Thu, Mar 25, Jason D. Kelleher wrote:
In message 19990325105303.A7088@avatar.lsd.ornl.gov, mgx@spruce.lsd.ornl.g ov writes:
fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.
-- michael
That sounds slow. We're readying an F740 for production and our tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to a Sun "backup server" with a DLT4000 jukebox. That's theoretical max on a DLT4000 and still plenty of room on the network. Haven't tried multiple concurrent dumps yet, so I'm not sure how well that would scale. You should see about triple the throughput to a single DLT7000. jason
I pulled a random full backup of an F540 that is direct connected to a DLT7000 and it ran at 16.7 GB per hour. mrtg shows the CPU averaging 65% during the backup.
An F760 with a direct connected DLT7000 ran at 27.5 GB per hour. This barely gets the CPU above 20%.
I'd guess you're running up against some system resource on your F520. The type of data (lots of little files compared to not very many large files) can have a lot to do with it too. Is your filer busy doing other things while the backup is running?
BTW, we use Netbackup.
Graham
mgx@spruce.lsd.ornl.gov wrote:
i'd love to see 35-45GB/hour. the netapps are on a 100MB full-duplex lan. we're using budtool 4.5/ndmp and the tapedevice is nrst0a (70GB/compressed). this is what the netapp thinks about the tape drive/scsi adapter:
slot 2: SCSI Host Adapter 2 (QLogic ISP 1040B) Firmware Version 2.26 Clock Rate 60MHz. 4: QUANTUM DLT7000 1E48 In-Band Enclosure Services 0 Swap Events, 0 Enclosure Eventswhere is my problem i wonder?
-- michael
On Thu, Mar 25, Jason D. Kelleher wrote:
In message 19990325105303.A7088@avatar.lsd.ornl.gov, mgx@spruce.lsd.ornl.g ov writes:
fwiw, i'm backing up my two F520's via ndmp to a DLT7000 and i'm averaging about 11.7GB/hour.
-- michael
That sounds slow. We're readying an F740 for production and our tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to a Sun "backup server" with a DLT4000 jukebox. That's theoretical max on a DLT4000 and still plenty of room on the network. Haven't tried multiple concurrent dumps yet, so I'm not sure how well that would scale. You should see about triple the throughput to a single DLT7000. jason
On Thu, 25 Mar 1999, Jason D. Kelleher wrote:
That sounds slow. We're readying an F740 for production and our tests show ~3MB/s (~11GB/hr) over a 110mb full-duplex connection to a Sun "backup server" with a DLT4000 jukebox.
Wow, I'm glad we back up to a locally attached tape library. I'd be even more glad to attach a bigger library to a NAC SAN when we build one.
Tom
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Graham C. Knight -
Jason D. Kelleher -
mgx＠spruce.lsd.ornl.gov -
tkaczma＠gryf.net -
Will Harper