Forgive me, I do not know much about RAID so I'm going to be
as detailed as possible.
This morning, our server's alarm was going. I found that one
of our drives have failed. (we have 3)
It is an Adaptec ATA RAID 2400A controller
I'm purchasing a new SCSI drive today. My questions:
... (2 Replies)
hi all,
i have an p620 server. it has 2 scsi 18gb disks for aix4.3 OS and 3 ssa disks for database and an serialRAID adapter. 3 ssa disks configured raid level 5.
to increase capacity of the datavg, i buy 2 ssa 18gb disks. but i can not add them to the existing datavg. i did the following... (1 Reply)
Hi,
I have an ssa filesystem to move to san. We don't want any downtime. I heard that you can do a mirroring of existing file system on the san. The file system is a type of either raid 0, raid 1, or raid 5.
Anyone know how to do this?
Thanks in advance,
itik (4 Replies)
Hello, we have a problem with our system, a machine with a RAID5:
- We can boot the system from CD only, if we try to boot from hard-disk the GRUB seems to be "freezed". What is the difference, why we can boot from CD if something is wrong?
- Allways we retreive an error like: "raid array is... (6 Replies)
is placing two RAID5 arrays on disk as shown below Is advisable? Will this create performance problems?
sda-(500GB) sdb-(1TB) sdc-(1TB) sdd-(1TB)
(250MB)----------(250MB) ---------unused------------unused------->(/dev/md0) RAID1
... (6 Replies)
Hi there,
Don't know if my title is relevant but I'm dealing with dangerous materials that I don't really know and I'm very afraid to mess anything up.
I have a Debian 5.0.4 server with 4 x 1TB hard drives.
I have the following mdstat
Personalities :
md1 : active raid1 sda1 sdd1... (3 Replies)
Hi all,
I am currently using opensuse 12.1,
We have Raid 5 array of 8 disks. A friend of mine accidently removed a drive & place it back and also added a new disk to it(making it 9 disks). now the output of mdadm --detail is as shown below
si64:/dev # mdadm --detail /dev/md3
/dev/md3:... (1 Reply)
Hello Experts,
I have few doubts on RAID 5 with LUNs carved as STRIPE and CONCAT
RAID 5 = STRIPE + Parity mirroring
I would like to know if the LUNs carved are CONCATE from RAID 5 disk array. Are the I/Os are spread accross the disks within the RAID 5 Array? And if I do carve STRIPED... (1 Reply)
Hi All,
I have a new x3650 M4 server with hardware RAID 5 configured 4 x 300 GB (HDD).
The Raid controller is ServeRAID M5110e.
Im getting "device not found" error during hardisk detection of RHEL6 install using DVD.
Some pages over the net pointed to using ServerGuide media for... (1 Reply)
Discussion started by: Solaris_Begin
1 Replies
LEARN ABOUT OSF1
iostat
iostat(1) General Commands Manual iostat(1)NAME
iostat - Reports I/O statistics
SYNOPSIS
iostat [drive...] [interval] [count]
OPERANDS
Forces iostat to display specific drives. If drive is not specified (or the specified drive does not exist on the system or cluster,
iostat displays the first two drives (even if more than two disk drives are configured in the system). Causes iostat to report once each
interval seconds. The first report is for all time since the system was last booted, and each subsequent report is for the last interval
only.The value must not be 0. Specifies the number of reports. For example, iostat 1 10 would produce 10 reports at 1-second intervals.
You cannot specify count without interval because the first numeric argument to iostat is assumed to be interval.
DESCRIPTION
The iostat command reports the following information: For terminals (collectively), the number of characters read and written per second.
For each disk, the number of transfers per second and bytes transferred per second (in kilobytes). For the system, the percentage of time
the system has spent in user mode, in user mode running low priority (nice) processes, in system mode, and idling.
To compute this information, iostat counts data transfer completions, the number of words transferred for each disk, and the collective
number of input and output characters for terminals. Also, each sixtieth of a second, iostat examines the state of each disk and makes a
tally if the disk is active.
When you issue an iostat command on a cluster member, it displays statistics only for those disks that are local to the member and that
member's usage of those shared disks that it has mounted. It displays 0 for other disks in the cluster (those it doesn't have mounted),
regardless of whether they are on the shared bus or are local to some other member.
EXAMPLES
The output from this example displays cpu, terminal, and disk statistics for the first two disks on the system providing 5 reports at 1
second intervals:
# iostat 1 5
tty floppy1 dsk9 cpu
tin tout bps tps bps tps us ni sy id
0 3 0 0 0 0 1 0 4 95
4 58 0 0 0 0 1 0 2 97
1 53 0 0 0 0 0 0 2 98
5 59 0 0 0 0 1 0 1 98
6 60 0 0 0 0 1 0 2 97
The second example specifies device names in the command:
# iostat dsk2 dsk3 cdrom2
tty dsk2 cdrom2 dsk3 cpu
tin tout bps tps bps tps bps tps us ni sy id
0 13 11 5 5 2 2427 1213 0 1 1 98
SEE ALSO Commands:vmstat(1)iostat(1)