On Thu, 26 Aug 2010 07:51:56 -0400 (EDT), Steve Thompson
<smt AT vgersoft DOT com> wrote:
> On Thu, 26 Aug 2010, me AT free-minds DOT net wrote:
>
>> 1) do we really need to spool? We are not writing to real tapes, we
have
>> a
>> filesystem as backend (ext3 over glusterfs).
>
> I am one of those that believes spooling to be useful even when writing
> backups to disk; it is obviously not in question that it's good when
> writing to tape. I see the advantages as having the backup volumes less
> fragmented than when writing directly without a spool, especially when
> running many concurrent job, and this increases restoration performance.
mh afaik we are running only one job per tape
> In some scenarios, the spool may be faster anyway; for example, at home
I
> spool jobs to a collection of SCSI drives with the pools situated on a
set
> of ATA and USB drives (and btw, USB drives are sooooooo slow).
we are writing over 100MBit Network to another server, so we can just
write with max arround 4MB/s
my problem with spooling is that we need x hours to spool and nearly the
same time to despool. The despool process is only a few minutes faster. So
the transfer rate for spooling is quite the same than to the storage. So i
think spooling is here not really a performance boost?
on the other hand we have a FTP Backup Storage, where we use 100MB Tape
files, spooling here is much faster, because he can put the tape file
completly on the storage...
>
> Steve
>
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