RE: Max IO size - File System vs Raw
Until Solaris 2.5 it was hard coded limit of I/O size 64K. Has nothing to do with file system restriction on I/O size. Alex Hillman -Original Message- Sent: Thursday, September 06, 2001 12:47 PM To: Multiple recipients of list ORACLE-L Yeh - thats what I suspected - but no-one at Sun seems to wanna tell me that. Basically they're telling me, we can read up to maxphys - if you're not getting that, then it must be something non-Sun related Sounds like BS to me. --- Christopher Spence [EMAIL PROTECTED] wrote: A lot of file system's have a max io of much lower than raw. In the earlier Solaris's it was 64K, but as you see, it is now seems to be 256k. Under NT is 128k without using raw. To truly take advantage of MULTIBLOCK_READ_COUNT you need to use RAW file system. HP_UX I believe can do as high as 1Mb for this. Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes. Christopher R. Spence Oracle DBA Phone: (978) 322-5744 Fax:(707) 885-2275 Fuelspot 73 Princeton Street North, Chelmsford 01863 -Original Message- Sent: Thursday, September 06, 2001 9:11 AM To: Multiple recipients of list ORACLE-L Anyone know of any restrictions on the max physical IO (under Solaris8) that is imposed by file systems? To illustrate - Using a tablespace on a raw device under veritas vol mgr - maxphys is 512k - vxio:vol_maxio is 512k - db block size is 8k - db multi read is 64 and as expected, a level 8, 10046 trace shows me that I can get 512k max io...so far, so good If I repeat the exercise after putting a file system (vxfs or ufs) on this device, then the best I can get is 256k. Any Solaris internal people out there ? Cheers Connor = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christopher Spence INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hillman, Alex INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL
RE: Max IO size - File System vs Raw
A lot of file system's have a max io of much lower than raw. In the earlier Solaris's it was 64K, but as you see, it is now seems to be 256k. Under NT is 128k without using raw. To truly take advantage of MULTIBLOCK_READ_COUNT you need to use RAW file system. HP_UX I believe can do as high as 1Mb for this. Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes. Christopher R. Spence Oracle DBA Phone: (978) 322-5744 Fax:(707) 885-2275 Fuelspot 73 Princeton Street North, Chelmsford 01863 -Original Message- Sent: Thursday, September 06, 2001 9:11 AM To: Multiple recipients of list ORACLE-L Anyone know of any restrictions on the max physical IO (under Solaris8) that is imposed by file systems? To illustrate - Using a tablespace on a raw device under veritas vol mgr - maxphys is 512k - vxio:vol_maxio is 512k - db block size is 8k - db multi read is 64 and as expected, a level 8, 10046 trace shows me that I can get 512k max io...so far, so good If I repeat the exercise after putting a file system (vxfs or ufs) on this device, then the best I can get is 256k. Any Solaris internal people out there ? Cheers Connor = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christopher Spence INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
RE: Max IO size - File System vs Raw
Yeh - thats what I suspected - but no-one at Sun seems to wanna tell me that. Basically they're telling me, we can read up to maxphys - if you're not getting that, then it must be something non-Sun related Sounds like BS to me. --- Christopher Spence [EMAIL PROTECTED] wrote: A lot of file system's have a max io of much lower than raw. In the earlier Solaris's it was 64K, but as you see, it is now seems to be 256k. Under NT is 128k without using raw. To truly take advantage of MULTIBLOCK_READ_COUNT you need to use RAW file system. HP_UX I believe can do as high as 1Mb for this. Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes. Christopher R. Spence Oracle DBA Phone: (978) 322-5744 Fax:(707) 885-2275 Fuelspot 73 Princeton Street North, Chelmsford 01863 -Original Message- Sent: Thursday, September 06, 2001 9:11 AM To: Multiple recipients of list ORACLE-L Anyone know of any restrictions on the max physical IO (under Solaris8) that is imposed by file systems? To illustrate - Using a tablespace on a raw device under veritas vol mgr - maxphys is 512k - vxio:vol_maxio is 512k - db block size is 8k - db multi read is 64 and as expected, a level 8, 10046 trace shows me that I can get 512k max io...so far, so good If I repeat the exercise after putting a file system (vxfs or ufs) on this device, then the best I can get is 256k. Any Solaris internal people out there ? Cheers Connor = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christopher Spence INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). = Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) Some days you're the pigeon, some days you're the statue Do You Yahoo!? Get your free @yahoo.co.uk address at http://mail.yahoo.co.uk or your free @yahoo.ie address at http://mail.yahoo.ie -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services-- (858) 538-5051 FAX: (858) 538-5051 San Diego, California-- Public Internet access / Mailing Lists To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
