Re: [Amanda-users] Question corrupt amanda backup / tape speed / etc..help!
On Tue, Oct 28, 2008 at 1:39 PM, rory_f [EMAIL PROTECTED] wrote: We managed to up our speed of dumping and writing a whole lot by using a holding disk, which is great. However, the data we wrote, around 245gb, failed a amcheckdump and i couldnt, therefore, not amrestore anything. What was the output of amcheckdump? After the amtapetest, i was given an output of this: define tapetype ibm #123; nbsp; nbsp; comment just produced by tapetype prog #40;hardware compression off#41; nbsp; nbsp; length 402432 mbytes nbsp; nbsp; filemark 0 kbytes nbsp; nbsp; speed 57497 kps #125; Note that amtapetype overwrites the tape.. Also, it's very hard to read the above with all of the HTML entities in it. The logfile you excerpted was unreadable. dustin -- Storage Software Engineer http://www.zmanda.com
[Amanda-users] Question corrupt amanda backup / tape speed / etc..help!
This is an edited version of a previous post
Hi,
We managed to up our speed of dumping and writing a whole lot by using a
holding disk, which is great. However, the data we wrote, around 245gb, failed
a amcheckdump and i couldnt, therefore, not amrestore anything.
After the amtapetest, i was given an output of this:
define tapetype ibm {
comment just produced by tapetype prog (hardware compression off)
length 402432 mbytes
filemark 0 kbytes
speed 57497 kps
}
However, it says in the amreport we wrote to tape at :
Avg Tp Write Rate (k/s) 90801.790801.7--
Here is some of our amdump output:
diver: result time 6482.541 from taper: PARTDONE 00-2 AmaTor-004 5 41943040
[sec 449.501801 kb 41943040 kps 93310.059952]
driver: state time 6950.318 free kps: 10 space: 719002550 taper: writing
idle-dumpers: 1 qlen tapeq: 0 runq: 0 roomq: 0 wakeup: 0 driver-idle: no-dumpers
driver: interface-state time 6950.318 if default: free 10
driver: hdisk-state time 6950.318 hdisk 0: free 719002550 dumpers 0
driver: result time 6950.332 from taper: PARTDONE 00-2 AmaTor-004 6
41943040 [sec 466.669805 kb 41943040 kps 89877.338432]
driver: state time 7023.335 free kps: 10 space: 719002550 taper: writing
idle-dumpers: 1 qlen tapeq: 0 runq: 0 roomq: 0 wakeup: 0 driver-idle: no-dumpers
driver: interface-state time 7023.335 if default: free 10
driver: hdisk-state time 7023.335 hdisk 0: free 719002550 dumpers 0
driver: result time 7023.350 from taper: PARTDONE 00-2 AmaTor-004 7 5813290
[sec 71.901664 kb 5813290 kps 80850.562791]
driver: state time 7023.350 free kps: 10 space: 719002550 taper: writing
idle-dumpers: 1 qlen tapeq: 0 runq: 0 roomq: 0 wakeup: 0 driver-idle: no-dumpers
driver: interface-state time 7023.350 if default: free 10
driver: hdisk-state time 7023.350 hdisk 0: free 719002550 dumpers 0
How can this be? our holding disk is a sata1, 1tb disk. That write rate is
above what sata1 can give data out at, right? is this the reason for our data
corruption?
What else could it be? Do you need anymoer info to help diagnose this? We're
gonna hopefully try with a sata2 disk soon to see if that makes any difference.
The tapespeed variable in amanda.conf, to my understanding, would not allow me
to write at 9k~. Nor would the speed of a sata1 disk.
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Re: [Amanda-users] Question corrupt amanda backup / tape speed / etc..help!
Amanda writes data to tape as quickly as the tape drive will allow. The tapespeed is not currently used. The data may be in local cache, explaining some of the high speed. I don't know SATA-1 rates off the top of my head to know if that's too fast. Whatever goes on, data corruption should not result. I'm interested to hear what sort of corruption you're seeing. Dustin -- Storage Software Engineer http://www.zmanda.com
tape speed
I inherited a tapetype definition from an email message to this group for an SDLT drive. In it, it lists the tape speed as 2377 kps. Someone mentioned that this seemed slow. Last nights backup report says that the average write rate was STATISTICS: Total Full Daily Avg Tp Write Rate (k/s) 7052.3 7050.6 8238.1 Is it safe to bump this number up to 8238 in my config? JLM Jeremy Mordkoff Tatara Systems 978-206-0808 (direct) 978-206-0888 (fax) injustice anywhere threatens justice everywhere -- Dr. Martin Luther King
Re: tape speed
Jeremy L. Mordkoff wrote: I inherited a tapetype definition from an email message to this group for an SDLT drive. In it, it lists the tape speed as 2377 kps. Someone ... Is it safe to bump this number up to 8238 in my config? Yes it it safe. The speed number in tapetype currently isn't used in amanda. -- Paul Bijnens, XplanationTel +32 16 397.511 Technologielaan 21 bus 2, B-3001 Leuven, BELGIUMFax +32 16 397.512 http://www.xplanation.com/ email: [EMAIL PROTECTED] *** * I think I've got the hang of it now: exit, ^D, ^C, ^\, ^Z, ^Q, F6, * * quit, ZZ, :q, :q!, M-Z, ^X^C, logoff, logout, close, bye, /bye, * * stop, end, F3, ~., ^]c, +++ ATH, disconnect, halt, abort, hangup, * * PF4, F20, ^X^X, :D::D, KJOB, F14-f-e, F8-e, kill -1 $$, shutdown, * * kill -9 1, Alt-F4, Ctrl-Alt-Del, AltGr-NumLock, Stop-A, ...* * ... Are you sure? ... YES ... Phew ... I'm out * ***
