Re: amrecover very slow

Paul Bijnens wrote:
<snip>

Different possibilities.
First make sure the network is not in the way (e.g. a duplex
mismatch on one of the switches, frequent mistake).


I'm backing up the server with the tape drive in it.

Then, do you have "amrecover_do_fsf yes" in the configuration?
If not, then amanda will skip over the tape files by reading them.
If the image you need in near the end, that can take a while.


Yes it's there.

Next, how large is the image itself.  If the dump file is 30 Gbyte
then it still takes some time to crawl through that amount to locate
your 140K file.  A tape device is a sequential device.  Indexing
with amanda does not turn it into a random access device.


I'm aware that indexing doesn't make it a random access device.
I figured somehow it could speed up finding a file on tape though.
The netware server I'm replacing, (a very old pentium 133 with a DLT
tape drive and arcserve) could restore any file anywhere on tape in
less than a minute.  I figured this new setup on FreeBSD/Amanda
would be faster.

STATISTICS:
                          Total       Full      Daily
                        --------   --------   --------
Estimate Time (hrs:min)    0:02
Run Time (hrs:min)         2:43
Dump Time (hrs:min)        1:43       1:43       0:00
Output Size (meg)       12314.1    12314.1        0.0
Original Size (meg)     12314.1    12314.1        0.0
Avg Compressed Size (%)     --         --         --
Filesystems Dumped            1          1          0
Avg Dump Rate (k/s)      2038.2     2038.2        --

Tape Time (hrs:min)        0:58       0:58       0:00
Tape Size (meg)         12314.1    12314.1        0.0
Tape Used (%)              34.3       34.3        0.0
Filesystems Taped             1          1          0
Avg Tp Write Rate (k/s)  3616.1     3616.1        --

USAGE BY TAPE:
  Label              Time      Size      %    Nb
  DailySet1001       0:58   12314.1   34.3     1


NOTES:
  planner: Incremental of R4P17.gmihome.com:amrd0s1f bumped to level 2.
  taper: tape DailySet1001 kb 12609664 fm 1 [OK]


DUMP SUMMARY:
                                     DUMPER STATS            TAPER STATS
HOSTNAME     DISK        L ORIG-KB OUT-KB COMP% MMM:SS  KB/s MMM:SS  KB/s
-------------------------- --------------------------------- ------------
R4P17.gmihom amrd0s1f    0 1260962012609620   --  103:072038.2  58:073616.1

What is the raw speed of the tapedevice? Is it a DDS1 reading at200Kbytes/sec, or is it some superfast device doing 12Mbyte/secsustained? (Over a 100Mbit switch that's still limited to 6 Mbyte/sec,
maybe stops streaming on the tapedrive.)


Here's what tapetype gave me...

define tapetype Certance-CD72LWH-S {
    comment "Certance Tape Drive"
    length 35940 mbytes
    filemark 0 kbytes
    speed 3643 kps
}