I am writing 11gb from an F760 to a single dlt7000 on a sun 220r. Finishes in 40 minutes

art hebert

DUMP: creating "/vol/vol0/../snapshot_for_backup.195" snapshot. DUMP: Using subtree dump DUMP: Date of this level 0 dump: Tue Dec 10 13:06:44 2002. DUMP: Date of last level 0 dump: the epoch. DUMP: Dumping /vol/vol0/home/db_backup to sjcswm01 DUMP: mapping (Pass I)[regular files] DUMP: mapping (Pass II)[directories] DUMP: estimated 11405409 KB. DUMP: dumping (Pass III) [directories] DUMP: dumping (Pass IV) [regular files] DUMP: Tue Dec 10 13:11:53 2002 : We have written 1246308 KB. DUMP: Tue Dec 10 13:16:53 2002 : We have written 2547789 KB. DUMP: Tue Dec 10 13:21:53 2002 : We have written 3884289 KB. DUMP: Tue Dec 10 13:26:53 2002 : We have written 5186734 KB. DUMP: Tue Dec 10 13:31:53 2002 : We have written 6496818 KB. DUMP: Tue Dec 10 13:36:53 2002 : We have written 7694731 KB. DUMP: Tue Dec 10 13:41:53 2002 : We have written 9001257 KB. DUMP: Tue Dec 10 13:46:53 2002 : We have written 10341265 KB. DUMP: dumping (Pass V) [ACLs] DUMP: 11408523 KB DUMP: DUMP IS DONE

-----Original Message----- From: Kumar, Rahul [mailto:rahul.kumar@eds.com] Sent: Tuesday, December 10, 2002 7:40 AM To: Ambrose_Earle@shamrockfoods.com Cc: toasters@mathworks.com Subject: RE: Dump issue

SomeBody in Netapp Needs to look at this !

-----Original Message----- From: Ambrose_Earle@shamrockfoods.com [mailto:Ambrose_Earle@shamrockfoods.com] Sent: Tuesday, December 10, 2002 9:00 PM To: Kumar, Rahul Cc: toasters@mathworks.com Subject: Re: Dump issue

We are seeing very similar performance issues from our F840Cs. We have opened a case with NetApps, but have received very little information back from them.

In our case, a 3 drive volume backing up gzip'ed files maxes out our SDLT drives at nearly 11 MB/sec. We have a 6 drive volume of highly compressible information that will stream to tape at over 20 MB/sec. However, a 7 drive volume that only contains a few dozen very large Oracle datafiles, now at times struggles to write 4 MB/sec!

The only correlation that I can make is that when disk utilization goes above 40%, the backup speed plummets below 10 MB/sec. Have you tried running sysstat or statit during the backup?

My biggest concern is that this may be the first symptom of some major problem. If 7 drives can't read faster than 4MB/sec, then wouldn't you be a little worried?