Sponsored Content
Top Forums UNIX for Dummies Questions & Answers SAN and Disk I/O ... do we care? Post 302455088 by frank_rizzo on Monday 20th of September 2010 07:26:07 PM
Old 09-20-2010
are you actually seeing performance problems? the old rule is don't fix something if it's not broke. Don't try to "help the SAN". What your really saying is how can I minimize the disk I/O for a given server which is a good thing for a database server.

yes - you can create more file systems and spread tablespaces around. This can help performance even if the data is on the same LUNs. You can get benefits from OS file system caching and parallel I/O. check your bufferpool hit ratios. make sure your logs and tablespace data are in different file systems at minimum.
 

10 More Discussions You Might Find Interesting

1. AIX

AIX disk less with SAN

Hi All, I have mirrored SAN volume on my B80 rootvg. Can I just remove the mirror and "Remove a P V from a V G" and it will be a diskless AIX? Is that going to boot on SAN rootvg volume? Thanks in advance, itik (3 Replies)
Discussion started by: itik
3 Replies

2. Filesystems, Disks and Memory

disk errors with san snapshot

so we have a solrais 9 system attached to an HP SAN. we are using sssu to do snap clones every hour. the only problem is the we get write errors on the solrais system every time we do a snap. from /var/adm/messages Apr 21 14:37:48 svr001 scsi: WARNING:... (0 Replies)
Discussion started by: robsonde
0 Replies

3. AIX

hard disk and san

Hello everyone I got several aix boxes with aix 5.3 I got a ibm san ds4500 My question is How can I do a match between my disks on aix and the san? I try to do a match with the LUN but for example. In my san I got several 1 LUN and on one of my aix box I got this If I type lscfg... (4 Replies)
Discussion started by: lo-lp-kl
4 Replies

4. Solaris

SAN disk failure

hi all, have a solaris 9 OS and a SAN disk which used to work fine is not getting picked up by my machine. can anyone point out things to check in order to troubleshoot this ?? thanks in advance. (3 Replies)
Discussion started by: cesarNZ
3 Replies

5. Filesystems, Disks and Memory

SAN Disk w/o Cluster

Scenario: I've got 2 M5000's connected to a 9985 SAN storage array. I have configured the SAN disks with stmsboot, format and newfs. I can access the same SAN space from both systems. I have created files from both systems on the SAN space. Question: Why can't I see the file created... (3 Replies)
Discussion started by: bluescreen
3 Replies

6. Solaris

I/O Error on SAN Disk

Hi, I have a production solaris 10 SPARC system (portal). Yesterday legato/Networker gave an I/O Error on one of the files on its SAN mounted disk. I went to that particular file on the system, did an ls and it showed the file. However, ls -l did not work and it said IO error. ... (6 Replies)
Discussion started by: Mack1982
6 Replies

7. Solaris

Installing Solaris OS on LDOM SAN Disk

I have viewed a few previous posts regarding this, but none of them quite described or worked with my issue. I am out of local disk space on my LDOM Manager but still have plenty of SAN vCPU and Memory available so I am trying to install a new LDOM OS on SAN. I have exposed the SAN to the... (0 Replies)
Discussion started by: MobileGSP
0 Replies

8. Solaris

Solaris 10 booting from EMC SAN DISK

Hi All, I have server : Sun-Fire-V490 configured with Solaris 10 zfs .. and I have configured three mirror the third one from EMC storage. root@server # zpool status -v pool: rpool state: ONLINE status: The pool is formatted using an older on-disk format. The pool can ... (8 Replies)
Discussion started by: top.level
8 Replies

9. Red Hat

Sharing SAN disk with multiple severs

Hi , I had a requirement to share a san disk between two rhel severs. I am planning to discover the same disk in two rhel nodes and mount it. Is it a feasible solution? and what kind of issues we may encounter mounting same disk in two OS's parallel ? (2 Replies)
Discussion started by: nanduri
2 Replies

10. UNIX for Beginners Questions & Answers

SAN vs. Local disk.

I am in the market looking to purchase a new E950 server and I am trying to decide between using local SSD drives or SSD based SAN. The application that will be running on this server is read-intensive so I am looking for the most optimal configuration to support this application. There are no... (2 Replies)
Discussion started by: ikx
2 Replies
ALTER 
TABLESPACE(7) PostgreSQL 9.2.7 Documentation ALTER TABLESPACE(7) NAME
ALTER_TABLESPACE - change the definition of a tablespace SYNOPSIS
ALTER TABLESPACE name RENAME TO new_name ALTER TABLESPACE name OWNER TO new_owner ALTER TABLESPACE name SET ( tablespace_option = value [, ... ] ) ALTER TABLESPACE name RESET ( tablespace_option [, ... ] ) DESCRIPTION
ALTER TABLESPACE changes the definition of a tablespace. You must own the tablespace to use ALTER TABLESPACE. To alter the owner, you must also be a direct or indirect member of the new owning role. (Note that superusers have these privileges automatically.) PARAMETERS
name The name of an existing tablespace. new_name The new name of the tablespace. The new name cannot begin with pg_, as such names are reserved for system tablespaces. new_owner The new owner of the tablespace. tablespace_parameter A tablespace parameter to be set or reset. Currently, the only available parameters are seq_page_cost and random_page_cost. Setting either value for a particular tablespace will override the planner's usual estimate of the cost of reading pages from tables in that tablespace, as established by the configuration parameters of the same name (see seq_page_cost, random_page_cost). This may be useful if one tablespace is located on a disk which is faster or slower than the remainder of the I/O subsystem. EXAMPLES
Rename tablespace index_space to fast_raid: ALTER TABLESPACE index_space RENAME TO fast_raid; Change the owner of tablespace index_space: ALTER TABLESPACE index_space OWNER TO mary; COMPATIBILITY
There is no ALTER TABLESPACE statement in the SQL standard. SEE ALSO
CREATE TABLESPACE (CREATE_TABLESPACE(7)), DROP TABLESPACE (DROP_TABLESPACE(7)) PostgreSQL 9.2.7 2014-02-17 ALTER TABLESPACE(7)
All times are GMT -4. The time now is 07:00 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy