In the last episode (Jul 13), Andrea Venturoli said:
** Reply to note from Greg 'groggy' Lehey [EMAIL PROTECTED] Sat, 12 Jul 2003
17:13:29 +0930
The real performance penalty for RAID-5 is simply that writes require
so much I/O. Expect 25% of the write performance of RAID-0.
Ok, I must
On Sunday, 13 July 2003 at 14:14:53 -0500, Dan Nelson wrote:
In the last episode (Jul 13), Andrea Venturoli said:
** Reply to note from Greg 'groggy' Lehey [EMAIL PROTECTED] Sat, 12 Jul 2003
17:13:29 +0930
The real performance penalty for RAID-5 is simply that writes require
so much I/O.
On Mon, Jul 14, 2003 at 10:02:58AM +0930, Greg 'groggy' Lehey wrote:
I don't believe vinum can optimize full-stripe writes, though, since
FreeBSD can only do I/O in 64k max chunks,
128 kB.
Greg,
I thought physio was limited to 64 KB? The man page on dump
states this. Please correct me
On Sunday, 13 July 2003 at 20:57:46 -0500, Marc Wiz wrote:
On Mon, Jul 14, 2003 at 10:02:58AM +0930, Greg 'groggy' Lehey wrote:
I don't believe vinum can optimize full-stripe writes, though, since
FreeBSD can only do I/O in 64k max chunks,
128 kB.
I thought physio was limited to 64 KB? The
On Mon, Jul 14, 2003 at 11:49:14AM +0930, Greg 'groggy' Lehey wrote:
On Sunday, 13 July 2003 at 20:57:46 -0500, Marc Wiz wrote:
On Mon, Jul 14, 2003 at 10:02:58AM +0930, Greg 'groggy' Lehey wrote:
I don't believe vinum can optimize full-stripe writes, though, since
FreeBSD can only do I/O
On Sunday, 13 July 2003 at 22:01:37 -0500, Marc Wiz wrote:
On Mon, Jul 14, 2003 at 11:49:14AM +0930, Greg 'groggy' Lehey wrote:
On Sunday, 13 July 2003 at 20:57:46 -0500, Marc Wiz wrote:
On Mon, Jul 14, 2003 at 10:02:58AM +0930, Greg 'groggy' Lehey wrote:
I don't believe vinum can optimize
** Reply to note from Malcolm Kay [EMAIL PROTECTED] Sun, 13 Jul 2003 14:42:21 +0930
Shouldn't SCSI system allow paralell writes on different disks?
Physical writes yes. But how does the data get there?
The SCSI bus (like any other) has a finite bandwidth.
Ok, but suppose you have an
On Friday, 11 July 2003 at 22:21:19 -0700, Mike Maltese wrote:
Depends on what you mean. Vinum isn't a hardware device driver, so it
doesn't need to understand hot swapping. If you hot swap a drive,
Vinum handles the resulting events correctly.
So if I have a drive fail, say in a RAID 5
this is good news indeed. Thanks for your help!!
- Original Message -
From: Greg 'groggy' Lehey [EMAIL PROTECTED]
To: Mike Maltese [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: Saturday, July 12, 2003 12:43 AM
Subject: Re: vinum and hot-swapping
** Reply to note from Greg 'groggy' Lehey [EMAIL PROTECTED] Sat, 12 Jul 2003
17:13:29 +0930
The real performance penalty for RAID-5 is simply that writes require
so much I/O. Expect 25% of the write performance of RAID-0.
Ok, I must ask this:
Shouldn't SCSI system allow paralell writes on
On Sunday, 13 July 2003 at 4:45:08 -0500, Andrea Venturoli wrote:
** Reply to note from Greg 'groggy' Lehey [EMAIL PROTECTED] Sat, 12 Jul 2003
17:13:29 +0930
The real performance penalty for RAID-5 is simply that writes require
so much I/O. Expect 25% of the write performance of RAID-0.
On Sun, 13 Jul 2003 19:15, Andrea Venturoli wrote:
** Reply to note from Greg 'groggy' Lehey [EMAIL PROTECTED] Sat, 12 Jul
2003 17:13:29 +0930
The real performance penalty for RAID-5 is simply that writes require
so much I/O. Expect 25% of the write performance of RAID-0.
Ok, I must ask
Does vinum support hot-swapping? I've skimmed through the handbook and it isn't
immediately clear.
As an aside, I must say that I'm really quite that my Mylex AcceleRAID 250 won't play
nice with my new Intel U160 hot-swap backplane/enclosure. Both claim to be SAF-TE
compliant but the card
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Single line paragraphs.
On Friday, 11 July 2003 at 21:45:34 -0700, Mike Maltese wrote:
Does vinum support hot-swapping? I've skimmed through the handbook
and it isn't immediately clear.
Depends on what you mean. Vinum isn't
Depends on what you mean. Vinum isn't a hardware device driver, so it
doesn't need to understand hot swapping. If you hot swap a drive,
Vinum handles the resulting events correctly.
So if I have a drive fail, say in a RAID 5 configuration, I don't have to
detach it at all? Just swap them out
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