Re: holding disk when using HD backup ?
2006-03-07 15:13:27
On Tue, Mar 07, 2006 at 12:07:25PM -0800, Ram TK Krishnamurthy wrote:
> You generally do not use holding disks when backing up to disks.
>
> tk
>
> FM wrote:
> >Hello,
> >
> >Do I need a holdingdisk when I using hard drive backup ?
> >
> >I have a lots of iowait because of the copy from holding disk to virtual
> >tape even if the holding disk is on internal SCSI drives and tapes are
> >on an extrenal SCSI array (using sata drives)
Why not Ram? Without a holding disk only one client DLE can
be dumped at a time. The holding disk is to allow multiple
DLEs to collect simultaneously, only transfered to "tape"
when complete. Without a holding disk the DLE must be
dumped "directly to tape" eliminating all parallelism.
--
Jon H. LaBadie jon AT jgcomp DOT com
JG Computing
4455 Province Line Road (609) 252-0159
Princeton, NJ 08540-4322 (609) 683-7220 (fax)
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