3 messages in org.freebsd.freebsd-questionsRe: rdump question| From | Sent On | Attachments |
|---|---|---|
| Jim Van Baalen | May 22, 1998 9:55 am | |
| Greg Lehey | May 23, 1998 1:20 am | |
| Doug White | May 24, 1998 1:49 am |
| Subject: | Re: rdump question | |
|---|---|---|
| From: | Greg Lehey (gr...@lemis.com) | |
| Date: | May 23, 1998 1:20:49 am | |
| List: | org.freebsd.freebsd-questions | |
On Fri, 22 May 1998 at 9:56:05 -0700, Jim Van Baalen wrote:
I have been dumping several machines to local 8mm drives. Dump writes to these drives at about 4mbps.
What kind of drives are these? Most Exabytes maxe out at about 1 MB/s.
To conserve resources I have been trying to dump to the same model drive on a remote machine using the <hostname>: notation. When I do this dump writes at about .5mbps. Both machines are on dedicated 10bt switched connections and dump is definitely not taxing the 10bt connection. Both machines are 266Mhz which I have seen easily fill a switched 10bt connection. Neither machine is working particulary hard independent of the dump. I have tried replacing the 3COM 3C905 Fast Etherlink XL PCI with the Intel EtherExpress Pro 10/100B because I have had NFS problems while using the 3COM card. It appears the the default block size for dump is 1024 (as opposed to 8192 for NFS) so it I didn't think this would work, but I had the cards... With typical disk capacities of 4-9Gb dumping a drive at this speed can take over a day.
Is this expected behavior?
I'd expect that of non-compressing dumps. What kind of tape hardware are you using? Are you compressing?
Greg
-- See complete headers for address and phone numbers finger gr...@lemis.com for PGP public key
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