William,
Please don't forget to copy your replies to the 'amanda-users' list.
Valeriu
On Mon, Feb 22, 2010 at 12:17:25PM -0800, William Taylor wrote:
> It's a Dell PowerVault TL4000 connected via SAS
> The stripped holding or split_diskbuffer disk is 1.9T
>
> Il try to increase the split size and see what it does. It looked like to me
> before that
> it would write the split file to disk but I never say reads coming of the
> disk. Like it was writing
> it plus streaming it to tape at the same time. Is this normal?
>
> On Feb 22, 2010, at 10:47 AM, Valeriu Mutu wrote:
>
> > Hi William,
> >
> > Could you tell us please:
> > - What tape library are you using? There are various LTO-4 tapetype
> > definitions depending on your tape library.
> > - What is the size of the holding disk "hd1"? How much free space is
> > available on it?
> >
> > I'd try increasing the tape_splitsize to 200Gb (assuming you have this
> > amount of free space available on the /scratch filesystem):
> >
> > define dumptype user-tar-span {
> > #holdingdisk no
> > root-tar
> > tape_splitsize 200 Gb
> > split_diskbuffer "/scratch/"
> > #fallback_splitsize 8 Gb
> > priority medium
> > }
> >
> > Best,
> > Valeriu
> >
> > On Mon, Feb 22, 2010 at 10:11:01AM -0800, William Taylor wrote:
> >> I seem to be having some issues with amanda getting data off my drives in
> >> a reasonable time.
> >> using dd reading off my drives and writing to tape I get around 120mbs to
> >> the LTO4 drive.
> >> When using amanda however this number fluctuates quite a bit. At times I
> >> have seen it write to tape
> >> at around 110mbs but it's usually around 40 or so.
> >>
> >> I have tried several different configuration options and none seem to
> >> really improve the situation.
> >>
> >> I am using amanda to do local backups.
> >> I have a bunch of large (+2TB) netapp dumps on a 24 disk 16T raid5 array
> >> connected to a 3Ware.
> >> I have also configured a 14 disk netapp shelf with 15k scsi drives striped
> >> with software raid connected via a 2GB fcal to use as
> >> a scratch disk to break up dumps or to use as a holding disk.
> >>
> >>
> >> Can anyone recommend amanda config options that would work with my setup?
> >> So far it seems that best results are achieved without using the holding
> >> disk.
> >> I have tried setting the tape_splitsize to 4Gb and fallback_splitsize to
> >> 8Gb with no
> >> real change in performance. I have 12GB of memory.
> >>
> >>
> >> Heres the relevant bits I have so far:
> >>
> >> netusage 100 mbps
> >> device_output_buffer_size 1 Gb
> >> tapedev "tape:/dev/nst0"
> >> device_property "BLOCK_SIZE" "1024k"
> >>
> >> holdingdisk hd1 {
> >> comment "main holding disk"
> >> directory "/scratch/"
> >> use -100 Mb
> >> chunksize 80Gb
> >> }
> >>
> >> define tapetype LTO4 {
> >> comment "Dell LTO4 800Gb - Compression Off"
> >> length 802816 mbytes
> >> filemark 0 kbytes
> >> speed 120 mbps
> >> blocksize 1024 kbytes
> >> }
> >>
> >> define dumptype user-tar-span {
> >> #holdingdisk no
> >> root-tar
> >> tape_splitsize 80 Gb
> >> split_diskbuffer "/scratch/"
> >> #fallback_splitsize 8 Gb
> >> priority medium
> >> }
> >>
> >>
> >> If I need to provide anymore info let me know.
> >>
> >> Thanks,
> >> William
> >>
> >
>
