- Community Home
- >
- Servers and Operating Systems
- >
- Operating Systems
- >
- Operating System - HP-UX
- >
- Performance Disk I/O: slow tar copy from one disk ...
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-07-2010 06:54 PM
тАО09-07-2010 06:54 PM
OS: HP-UX 11.31 fully patched
disk in vg00 is local 146G 15kHz
disk in vg01 is CLARiiON RAID
command is:
tar -cf . | ( cd /new_dir ; tar -xvf -)
Stats:
19:46:30 device %busy avque r+w/s blks/s avwait avserv
19:46:40 c4t0d0 0.30 0.50 5 51 0.00 0.70
c7t0d0 0.30 0.50 5 38 0.00 0.71
c7t0d2 0.10 0.50 0 0 0.00 0.15
disk3 4.10 0.60 21 249 0.20 4.86
disk23 0.70 0.50 11 90 0.00 0.71
19:46:50 c4t0d0 0.40 0.50 6 65 0.00 0.65
c7t0d0 0.40 0.50 6 21 0.00 0.63
disk3 3.00 0.83 18 102 1.80 5.22
disk23 0.70 0.50 12 86 0.00 0.64
Average c4t0d0 0.35 0.50 6 58 0.00 0.68
Average c7t0d0 0.35 0.50 5 30 0.00 0.67
Average c7t0d2 0.05 0.50 0 0 0.00 0.15
Average disk3 3.55 0.70 20 176 0.93 5.02
Average disk23 0.70 0.50 11 88 0.00 0.67
source is disk3, local SAS drive
destination is c4t0d0, CLARiiON disk
there is nothing running on this host at all.
top shows tar processes at the top
load is 0.05
This looks like a CDROM copy for all intents and purposes!
Solved! Go to Solution.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-07-2010 08:36 PM
тАО09-07-2010 08:36 PM
Re: Performance Disk I/O: slow tar copy from one disk to another
Local SAS is always slower than FC SAN , since in this case the IO is from SAS thru smartarray controller , fiber , san s/w san controller and than finally the destination san disk, how many path you see for the SAN disk if you do a ioscan -m dsf /dev/dsk/c4t0d0.Also check the firmware verison of sas controller on rx2660.
Regards,
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-07-2010 11:12 PM
тАО09-07-2010 11:12 PM
Solution- is the Clariion on at least FLARE26?
- are all the LUNs presented to HP-UX 11.31 system configured in failover mode 4 (ALUA)
If not, then the default load balancing algorithms in 11.31 will cause constant tresapassing, meaning that for every IO the Clariion needs to move the LUN from one controller to another - this doesn't appear as any error messages on the host side, but does result in painfully slow IO.
HTH
Duncan
I am an HPE Employee
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-08-2010 07:32 AM
тАО09-08-2010 07:32 AM
Re: Performance Disk I/O: slow tar copy from one disk to another
We're looking into the CLARiiON settings, FW (seems to be at the correct level) and any other settings. Could be we eventually pull PowerPath out altogether and go native path balancing, but EMC cringes at that.
Stand by....
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-08-2010 11:28 AM
тАО09-08-2010 11:28 AM
Re: Performance Disk I/O: slow tar copy from one disk to another
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО09-10-2010 06:46 AM
тАО09-10-2010 06:46 AM
Re: Performance Disk I/O: slow tar copy from one disk to another
Removing powerpath on a hp-ux 11.31 is always a good first step. ;)
Post then, ioscan -m dsf, ioscan -fn, ioscan -fnN, scsimgr get_info -D
output.
And also what sort of clariion diskarray is it ?
Greetz,
Chris