You are correct, which brings back my original argument, which I must now clarify.
The maximum track size support by the ECKD architecture is 16,777,215. Within a track, the maximum data block size is 65,535. So, what is the maximum capacity of a logical device supported by the ECKD architecture? 65,535 cylinders / logical device 65,535 tracks / cylinder 17,777,215 bytes / track In order words, approximately 2**56 bytes (65,536 Tb). A mere 256 such devices would equate to an entire 64-bit address space. I say again, we do not at this time have a capacity limitation problem. The ECKD architecture will support far more addressable storage than any site is likely to have access to (i.e., a single ECKD logical device could hold as much as 250,000 250 Gb disks). John P Baker Software Engineer -----Original Message----- From: Bruce Black <[EMAIL PROTECTED]> Sent: Jul 20, 2005 12:29 PM To: [email protected] Subject: Re: capacity of largest drive > > >The maximum track capacity is then 65,535 bytes. > No, the max size of a single record (block) is 65535 and most access methods only support up to 32760. But you can write multiple records per track, up to 255 (the record number is 1 byte). ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
