Slow restores
1999-10-12 23:16:00
>Hi all
>
>I have seen a lot about slow restores on this group but had first class
>experience on this last week. A hard disk in one our file servers crashed.
>It is a 8.4 Gig drive with compression turned on which gave us approx 12gig
>of data that needed to be restored. We have done a lot of directory and SQL
>database restores and have been able to restore 25gig in +- 2 hours.
Because
>this is a medium shop we currently use one DLT 2700 auto library for the
>backups.
>We take daily incremental backups which we keep for 60 days and a full
>monthly backup which are kept for 2 years.
>
>The disk crashed on Monday morning and a full backup was taken on the
>Sunday. We started the restore of all active files and directories and the
>first tapes that were used to backup the node was recalled. We mounted 83
>cartridges and it took 29 hours to restore the drive.
>
>Our backup server is running NT and the client is NT as well. ADSM is on
V3.
>The backup server hardware config is dual P11 350 with 512MB ram. The time
>constraint in this case was library. I calculated that the actual data
>transfer time was about two hours and the rest of the time was checkin and
>out as well as search times.
>
>A bigger magstar or ATL library is in our long term strategy but management
>has asked me to investigate other possibilities off decreasing the restore
>times.
>
>Why did ADSM rebuild the drive from a total of 83 tapes and not from the
>monthend backup tape. Would a point in time restore have made a
difference.I
>thought that a restore of the active files would go back to when the last
>backup of that file was taken.
>
>We have been on ADSM for about a year and a half but this was the first
time
>we needed to restore a whole user directory(46000 files).
>
>Our biggest file server consists of about 280 000 files and I don't know
how
>long this will take.
>
>Any suggestions on this? Our full monthly backup is run with a different
>policy set and according to backup stats do backup 99% of the files on the
>drive, but it did not ask for the monthly tape during the restore.
>
>
>Johan Gouws
>Johang AT hollard.co DOT za <mailto:Johang AT hollard.co DOT za>
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