- Community Home
- >
- Servers and Operating Systems
- >
- Operating Systems
- >
- Operating System - HP-UX
- >
- Re: how often the OS buffer cache is sync'd.
Operating System - HP-UX
1752294
Members
4465
Online
108786
Solutions
Forums
Categories
Company
Local Language
юдл
back
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
юдл
back
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
Blogs
Information
Community
Resources
Community Language
Language
Forums
Blogs
Go to solution
Topic Options
- 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
тАО11-10-2004 02:39 AM
тАО11-10-2004 02:39 AM
Re: how often the OS buffer cache is sync'd.
Ok
I'm going to modify dbc_min_pct and max ( not today, this is prod environment).
And see what happen !
For JFS
swlist -l bundle|grep -i OnlineJFS produce nothing ( I've tried also with fileset ).
Can you tell me on what CD is the JFS, and if I go to JFS what I need to know. Should I backup and recreate my filesystem ( I currently use LVM ).
Disk config is Fiber channel bus -> DS2400 -> several 18Gb disk.
The db is on a Mirror-ux disk ( 1 - 1 ) .
No raid (hard)
As we have plenty disk I was wondering about stripping but I've no knowlegde on this. Do you think someone on this forum can guide me to do it in the future. Or does it require HP engineer !
I know quite well HPUX and understand HP LVM.
Thank again to all
Xavier
I'm going to modify dbc_min_pct and max ( not today, this is prod environment).
And see what happen !
For JFS
swlist -l bundle|grep -i OnlineJFS produce nothing ( I've tried also with fileset ).
Can you tell me on what CD is the JFS, and if I go to JFS what I need to know. Should I backup and recreate my filesystem ( I currently use LVM ).
Disk config is Fiber channel bus -> DS2400 -> several 18Gb disk.
The db is on a Mirror-ux disk ( 1 - 1 ) .
No raid (hard)
As we have plenty disk I was wondering about stripping but I've no knowlegde on this. Do you think someone on this forum can guide me to do it in the future. Or does it require HP engineer !
I know quite well HPUX and understand HP LVM.
Thank again to all
Xavier
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2004 02:55 AM
тАО11-10-2004 02:55 AM
Re: how often the OS buffer cache is sync'd.
OnlineJFS is not free. You will need to contact your resseller. OnlineJFS main goal is to provide Online resizing of FS (Do not need to unmount a FS to add space). Install needs a reboot.
If you have already set up mirroring and have space for it, I would tell you not to stripe.
You don't need someone to set up stripping. It is not harder than mirroring. There are just things you must do and some not. If you plan to do it, just ask advices here.
Regards,
Fred
If you have already set up mirroring and have space for it, I would tell you not to stripe.
You don't need someone to set up stripping. It is not harder than mirroring. There are just things you must do and some not. If you plan to do it, just ask advices here.
Regards,
Fred
--
"Reality is just a point of view." (P. K. D.)
"Reality is just a point of view." (P. K. D.)
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2004 03:10 AM
тАО11-10-2004 03:10 AM
Re: how often the OS buffer cache is sync'd.
Hi Xavier,
You will have to buy Online-JFS...
I do lvm striping over a HDS SAN (raid5...)
to get something like loadbalancing... (I know there is a software for that but its again a question of time ($$$)...
I believe you will gain in I/O bandwidth (I do see quite a difference...)by striping - and its not difficult...
create striped swap...
#/sbin/lvcreate -l 1016 -n lvol2 -i 4 -I 256 -r y -C n -s y -p w -d p s4vg01
Here is how to see queue depth and I/O timeout:
# pvdisplay /dev/dsk/c4t0d0
--- Physical volumes ---
PV Name /dev/dsk/c4t0d0
PV Name /dev/dsk/c8t0d0 Alternate Link
VG Name /dev/s4vg01
PV Status available
Allocatable yes
VGDA 2
Cur LV 8
PE Size (Mbytes) 4
Total PE 3472
Free PE 1045
Allocated PE 2427
Stale PE 0
IO Timeout (Seconds) 180
Autoswitch On
# scsictl -a /dev/rdsk/c4t0d0
immediate_report = 0; queue_depth = 8
All the best
Victor
You will have to buy Online-JFS...
I do lvm striping over a HDS SAN (raid5...)
to get something like loadbalancing... (I know there is a software for that but its again a question of time ($$$)...
I believe you will gain in I/O bandwidth (I do see quite a difference...)by striping - and its not difficult...
create striped swap...
#/sbin/lvcreate -l 1016 -n lvol2 -i 4 -I 256 -r y -C n -s y -p w -d p s4vg01
Here is how to see queue depth and I/O timeout:
# pvdisplay /dev/dsk/c4t0d0
--- Physical volumes ---
PV Name /dev/dsk/c4t0d0
PV Name /dev/dsk/c8t0d0 Alternate Link
VG Name /dev/s4vg01
PV Status available
Allocatable yes
VGDA 2
Cur LV 8
PE Size (Mbytes) 4
Total PE 3472
Free PE 1045
Allocated PE 2427
Stale PE 0
IO Timeout (Seconds) 180
Autoswitch On
# scsictl -a /dev/rdsk/c4t0d0
immediate_report = 0; queue_depth = 8
All the best
Victor
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО11-10-2004 03:20 AM
тАО11-10-2004 03:20 AM
Re: how often the OS buffer cache is sync'd.
If you plan to stripe, create VGs where all LVs are stripped on the same number of disks (Like for Mirroring). If you don't, you could came to a situation with a LV that you cannot extend on a VG with plenty of space.
For your DB, Stripping may not be a good thing unless you have a SAN array with multiple paths to disks (Controlers, Fibers and LUN created to balance accesses). In other cases (classic SCSI internal drives or SCSI array), you may have better IOs with Mirror.
Regards,
Fred
For your DB, Stripping may not be a good thing unless you have a SAN array with multiple paths to disks (Controlers, Fibers and LUN created to balance accesses). In other cases (classic SCSI internal drives or SCSI array), you may have better IOs with Mirror.
Regards,
Fred
--
"Reality is just a point of view." (P. K. D.)
"Reality is just a point of view." (P. K. D.)
- « Previous
-
- 1
- 2
- Next »
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
News and Events
Support
© Copyright 2024 Hewlett Packard Enterprise Development LP